Climate and average weather in Thành Phố Uông Bí
In Thành Phố Uông Bí, the summers are oppressive, hot, wet, and mostly cloudy and the winters are mild and mostly cloudy.
Over the course of the year, the temperature in Thành Phố Uông Bí typically varies from 14°C to 32°C, and is rarely below 9°C or above 35°C. June is the hottest month of the year, while January is the coldest.
Based on the travel score, the best time of year to visit Thành Phố Uông Bí for warm-weather activities is from late October to mid April.
- Hottest
- Jun
- 32°
- Coldest
- Jan
- 14°
- Wettest
- Aug
- 371 mm
- Driest
- Feb
- 19 mm
- Rain / yr
- 1756 mm
- 173 wet days
- Daylight
- 10.7–13.3 h
- shortest–longest
- Elevation
- 11 m
- 21.0°N
- Clearest
- Nov
- 55% cloud
Thành Phố Uông Bí is city in north-east, Vietnam.
- Density
- 249/km²
- people per km²
- Founded
- 1961
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Thành Phố Uông Bí weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around late October to mid April.
Temperature through the year
Daily average highs and lows in Thành Phố Uông Bí, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 5.6 months, from April 28 to October 13, with daily high temperatures above 29°C. The hottest month of the year in Thành Phố Uông Bí is June, with an average high of 32°C and low of 27°C.
The cool season lasts 2.6 months, from December 12 to February 28, with daily high temperatures below 22°C. The coldest month of the year in Thành Phố Uông Bí is January, with an average low of 14°C and high of 20°C.
Days typically run about 6°C warmer than nights year-round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 20 | 21 | 23 | 27 | 31 | 32 | 32 | 32 | 31 | 29 | 26 | 22 |
| Avg low (°C) | 14 | 16 | 18 | 22 | 25 | 27 | 27 | 26 | 25 | 22 | 19 | 15 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 20 | 14 |
| Feb | 21 | 16 |
| Mar | 23 | 18 |
| Apr | 27 | 22 |
| May | 31 | 25 |
| Jun | 32 | 27 |
| Jul | 32 | 27 |
| Aug | 32 | 26 |
| Sep | 31 | 25 |
| Oct | 29 | 22 |
| Nov | 26 | 19 |
| Dec | 22 | 15 |
How hot and cold Thành Phố Uông Bí really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the hottest afternoons, once humidity is folded in, Thành Phố Uông Bí feels like about 41°C (around June 24). About 169 days a year carry some heat stress, and 95 of them tip into dangerous heat (feels-like above 39°C), peaking in June.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 20 | 21 | 23 | 29 | 36 | 40 | 40 | 40 | 37 | 31 | 26 | 22 |
| Air high (°C) | 20 | 21 | 23 | 27 | 31 | 32 | 32 | 32 | 31 | 29 | 26 | 22 |
| Feels-like low (°C) | 14 | 16 | 18 | 22 | 25 | 27 | 27 | 26 | 25 | 22 | 19 | 15 |
| Air low (°C) | 14 | 16 | 18 | 22 | 25 | 27 | 27 | 26 | 25 | 22 | 19 | 15 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 20 | 20 | 14 | 14 |
| Feb | 21 | 21 | 16 | 16 |
| Mar | 23 | 23 | 18 | 18 |
| Apr | 29 | 27 | 22 | 22 |
| May | 36 | 31 | 25 | 25 |
| Jun | 40 | 32 | 27 | 27 |
| Jul | 40 | 32 | 27 | 27 |
| Aug | 40 | 32 | 26 | 26 |
| Sep | 37 | 31 | 25 | 25 |
| Oct | 31 | 29 | 22 | 22 |
| Nov | 26 | 26 | 19 | 19 |
| Dec | 22 | 22 | 15 | 15 |
Average hourly temperature in Thành Phố Uông Bí
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on June afternoons, near 32°C, and coldest before dawn in January, near 14°C.
Thành Phố Uông Bí weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 20° / 14° | 30 | 6 | 10.9 | 6.4 |
| Feb | 21° / 16° | 19 | 5.7 | 11.3 | 6.5 |
| Mar | 23° / 18° | 43 | 9.1 | 11.9 | 6.6 |
| Apr | 27° / 22° | 75 | 12 | 12.5 | 5.6 |
| May | 31° / 25° | 241 | 19.8 | 13 | 3.6 |
| Jun | 32° / 27° | 260 | 22.5 | 13.3 | 2.6 |
| Jul | 32° / 27° | 290 | 24.6 | 13.2 | 2.5 |
| Aug | 32° / 26° | 371 | 26.6 | 12.7 | 2.5 |
| Sep | 31° / 25° | 242 | 20.3 | 12.1 | 3.4 |
| Oct | 29° / 22° | 104 | 12.5 | 11.5 | 5.4 |
| Nov | 26° / 19° | 53 | 7.8 | 11 | 7.1 |
| Dec | 22° / 15° | 29 | 5.7 | 10.7 | 7.1 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Thành Phố Uông Bí gets about 1756 mm of precipitation a year. On a typical day the chance of rain is very wet, but that rises and falls sharply with the seasons.
The wetter season lasts 5.3 months, from around Apr 28 to Oct 6, peaking in August at about 87% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Dec 20.
August is the wettest month by volume, with 371 mm over about 27 wet days; February is the driest, with 19 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 19 | 20 | 29 | 41 | 63 | 75 | 80 | 86 | 67 | 40 | 26 | 19 |
| Rain days | 6 | 6 | 9 | 12 | 20 | 23 | 25 | 27 | 20 | 13 | 8 | 6 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 19 | 6 |
| Feb | 20 | 6 |
| Mar | 29 | 9 |
| Apr | 41 | 12 |
| May | 63 | 20 |
| Jun | 75 | 23 |
| Jul | 80 | 25 |
| Aug | 86 | 27 |
| Sep | 67 | 20 |
| Oct | 40 | 13 |
| Nov | 26 | 8 |
| Dec | 19 | 6 |
Monthly rainfall
Over a full year, Thành Phố Uông Bí collects about 1756 mm of rain across 173 wet days — roughly 146 mm in an average month.
It doesn’t fall evenly. August is the wettest month with 371 mm, while February is the driest at just 19 mm. The three wettest months alone bring about 52% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 30 | 19 | 43 | 75 | 241 | 260 | 290 | 371 | 242 | 104 | 53 | 29 |
| Rain days | 6 | 6 | 9 | 12 | 20 | 23 | 25 | 27 | 20 | 13 | 8 | 6 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 30 | 6 |
| Feb | 19 | 6 |
| Mar | 43 | 9 |
| Apr | 75 | 12 |
| May | 241 | 20 |
| Jun | 260 | 23 |
| Jul | 290 | 25 |
| Aug | 371 | 27 |
| Sep | 242 | 20 |
| Oct | 104 | 13 |
| Nov | 53 | 8 |
| Dec | 29 | 6 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Thành Phố Uông Bí, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.
The clearer part of the year begins around September 12 and lasts for 3.8 months, ending around January 5. The clearest month is October, when the sky is clear, mostly clear, or partly cloudy 55% of the time on average.
The cloudier part of the year begins around May 15 and lasts for 3.9 months, ending around September 11. The cloudiest month is June, when it is overcast or mostly cloudy 88% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 24 | 21 | 17 | 24 | 25 | 12 | 15 | 18 | 33 | 55 | 53 | 39 |
| Cloudier (%) | 76 | 79 | 83 | 76 | 75 | 88 | 85 | 82 | 67 | 45 | 47 | 61 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 24 | 76 |
| Feb | 21 | 79 |
| Mar | 17 | 83 |
| Apr | 24 | 76 |
| May | 25 | 75 |
| Jun | 12 | 88 |
| Jul | 15 | 85 |
| Aug | 18 | 82 |
| Sep | 33 | 67 |
| Oct | 55 | 45 |
| Nov | 53 | 47 |
| Dec | 39 | 61 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 11, brings about 13 h 18 min of light; the shortest, around January 1, only 10 h 42 min — a swing of roughly 2 h 36 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.9 | 11.3 | 11.9 | 12.5 | 13.0 | 13.3 | 13.2 | 12.7 | 12.1 | 11.5 | 11.0 | 10.7 |
| Sunrise (AM) | 6:37 | 6:29 | 6:07 | 5:39 | 5:19 | 5:15 | 5:24 | 5:35 | 5:44 | 5:53 | 6:09 | 6:27 |
| Sunset (PM) | 5:28 | 5:46 | 5:58 | 6:08 | 6:19 | 6:31 | 6:33 | 6:19 | 5:51 | 5:23 | 5:08 | 5:11 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 10.9 | 6:37 | 5:28 |
| Feb | 11.3 | 6:29 | 5:46 |
| Mar | 11.9 | 6:07 | 5:58 |
| Apr | 12.5 | 5:39 | 6:08 |
| May | 13.0 | 5:19 | 6:19 |
| Jun | 13.3 | 5:15 | 6:31 |
| Jul | 13.2 | 5:24 | 6:33 |
| Aug | 12.7 | 5:35 | 6:19 |
| Sep | 12.1 | 5:44 | 5:51 |
| Oct | 11.5 | 5:53 | 5:23 |
| Nov | 11.0 | 6:09 | 5:08 |
| Dec | 10.7 | 6:27 | 5:11 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Thành Phố Uông Bí averages about 5 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 2 and 13 days.
The sunnier stretch runs 3.9 months, from around Sep 12 to Jan 7. The sunniest month is November, with roughly 10 sunny days (mixed).
The greyest month is June, down near 2 sunny days — about 82% fewer than the November peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 5 | 3 | 3 | 3 | 3 | 2 | 2 | 3 | 6 | 11 | 10 | 8 |
| Sky | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Mixed | Mixed | Mixed |
| Sunny days | Sky | |
|---|---|---|
| Jan | 5 | Gloomy |
| Feb | 3 | Gloomy |
| Mar | 3 | Gloomy |
| Apr | 3 | Gloomy |
| May | 3 | Gloomy |
| Jun | 2 | Gloomy |
| Jul | 2 | Gloomy |
| Aug | 3 | Gloomy |
| Sep | 6 | Gloomy |
| Oct | 11 | Mixed |
| Nov | 10 | Mixed |
| Dec | 8 | Mixed |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In Thành Phố Uông Bí, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 7.4 months, from around March 23 to November 1. The muggiest month is May, when the air feels humid, muggy or worse about 99% of the time.
The most comfortable stretch runs from around November 2 to March 22, and December is the most comfortable month — the air is dry or comfortable 64% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 48 | 34 | 13 | 2 | 0 | 0 | 0 | 0 | 0 | 2 | 16 | 43 |
| Comfortable (%) | 18 | 19 | 14 | 5 | 1 | 0 | 0 | 0 | 0 | 5 | 17 | 20 |
| Humid (%) | 20 | 23 | 21 | 11 | 2 | 0 | 0 | 0 | 2 | 14 | 23 | 19 |
| Muggy (%) | 13 | 19 | 33 | 21 | 9 | 1 | 0 | 0 | 7 | 24 | 21 | 13 |
| Oppressive (%) | 1 | 5 | 19 | 44 | 25 | 6 | 1 | 2 | 21 | 38 | 21 | 4 |
| Miserable (%) | 0 | 0 | 0 | 15 | 63 | 93 | 99 | 98 | 69 | 17 | 2 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| Jan | 48 | 18 | 20 | 13 | 1 | 0 |
| Feb | 34 | 19 | 23 | 19 | 5 | 0 |
| Mar | 13 | 14 | 21 | 33 | 19 | 0 |
| Apr | 2 | 5 | 11 | 21 | 44 | 15 |
| May | 0 | 1 | 2 | 9 | 25 | 63 |
| Jun | 0 | 0 | 0 | 1 | 6 | 93 |
| Jul | 0 | 0 | 0 | 0 | 1 | 99 |
| Aug | 0 | 0 | 0 | 0 | 2 | 98 |
| Sep | 0 | 0 | 2 | 7 | 21 | 69 |
| Oct | 2 | 5 | 14 | 24 | 38 | 17 |
| Nov | 16 | 17 | 23 | 21 | 21 | 2 |
| Dec | 43 | 20 | 19 | 13 | 4 | 0 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Across the year, average wind speed in Thành Phố Uông Bí is typically calm, near 9 km/h, and varies little with the seasons.
The windier part of the year lasts 5.2 months, from around Feb 17 to Jul 24. The windiest month is April, averaging about 10 km/h (calm).
The calmer part of the year runs from around Jul 25 to Feb 16, with September the calmest month at about 7 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 8 | 9 | 9 | 10 | 10 | 9 | 9 | 7 | 7 | 8 | 8 | 8 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 8 | calm |
| Feb | 9 | calm |
| Mar | 9 | calm |
| Apr | 10 | calm |
| May | 10 | calm |
| Jun | 9 | calm |
| Jul | 9 | calm |
| Aug | 7 | calm |
| Sep | 7 | calm |
| Oct | 8 | calm |
| Nov | 8 | calm |
| Dec | 8 | calm |
Hazard calendar for Thành Phố Uông Bí
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
Thành Phố Uông Bí sits in the Pacific typhoon belt; the season peaks July–October.
Thành Phố Uông Bí's monsoon runs May–September, when most of the year's rain falls.
Best time to visit Thành Phố Uông Bí
To characterize how pleasant the weather is in Thành Phố Uông Bí throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around early April, Thành Phố Uông Bí is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit Thành Phố Uông Bí for general outdoor tourist activities is from late October to mid April, with a peak score in the last week of November.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 6.5 | 6.6 | 6.5 | 5.6 | 3.6 | 2.6 | 2.5 | 2.5 | 3.4 | 5.4 | 7.1 | 7.1 |
| Rating | good | good | good | good | fair | poor | poor | poor | poor | fair | good | good |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 6.5 | good |
| Feb | 6.6 | good |
| Mar | 6.5 | good |
| Apr | 5.6 | good |
| May | 3.6 | fair |
| Jun | 2.6 | poor |
| Jul | 2.5 | poor |
| Aug | 2.5 | poor |
| Sep | 3.4 | poor |
| Oct | 5.4 | fair |
| Nov | 7.1 | good |
| Dec | 7.1 | good |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best times of year to visit Thành Phố Uông Bí for hot-weather activities run from late March to early May and again from late September to early December, with a peak score in the last week of October.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for Thành Phố Uông Bí, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
For a warm-season trip around June (highs near 32°C), the essentials are light clothes, rain gear and sun protection. In the cold season around January (highs near 20°C), pack a light layer.
In June, Thành Phố Uông Bí sees daytime highs around 32°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 23 days see rain.
Sea temperature near Thành Phố Uông Bí
Average ocean temperature at the nearest coast, month by month, banded into swim-comfort zones — the other half of the beach question.
The sea at the nearest coast (about 47 km away) is warmest in August at about 30°C and coldest in February near 20°C.
It's comfortable for a long swim from Feb 28 to Jan 27 — about 11 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 20 | 20 | 20 | 23 | 27 | 29 | 30 | 30 | 29 | 28 | 26 | 23 |
| Comfort | Refreshing | Cool | Refreshing | Refreshing | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 20 | Refreshing |
| Feb | 20 | Cool |
| Mar | 20 | Refreshing |
| Apr | 23 | Refreshing |
| May | 27 | Warm |
| Jun | 29 | Tropical |
| Jul | 30 | Tropical |
| Aug | 30 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Warm |
| Nov | 26 | Warm |
| Dec | 23 | Refreshing |
UV index (midday) in Thành Phố Uông Bí by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in Thành Phố Uông Bí peaks around July 10 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 6 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 7 | 7 | 8 | 7 | 10 | 12 | 12 | 8 | 9 | 9 | 6 | 6 |
| Level | High | Very high | Very high | Very high | Very high | Extreme | Extreme | Very high | Very high | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 7 | High |
| Feb | 7 | Very high |
| Mar | 8 | Very high |
| Apr | 7 | Very high |
| May | 10 | Very high |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 8 | Very high |
| Sep | 9 | Very high |
| Oct | 9 | Very high |
| Nov | 6 | High |
| Dec | 6 | High |
Average hourly UV index in Thành Phố Uông Bí
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in July the burn window is concentrated in the middle of the day: about 8.5 hours a day reach index 3 (protection recommended), and 6.5 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 6 | 6 | 7 | 7 | 8 | 8.5 | 8.5 | 7 | 7 | 6.5 | 5.5 | 5.5 |
| UV ≥ 6 (h/day) | 2.5 | 3 | 4 | 3.5 | 5.5 | 6 | 6.5 | 4 | 4.5 | 4 | 2 | 1 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 6 | 2.5 |
| Feb | 6 | 3 |
| Mar | 7 | 4 |
| Apr | 7 | 3.5 |
| May | 8 | 5.5 |
| Jun | 8.5 | 6 |
| Jul | 8.5 | 6.5 |
| Aug | 7 | 4 |
| Sep | 7 | 4.5 |
| Oct | 6.5 | 4 |
| Nov | 5.5 | 2 |
| Dec | 5.5 | 1 |
Air quality in Thành Phố Uông Bí by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in Thành Phố Uông Bí is worst in December — around 92 µg/m³ PM2.5 (unhealthy), about 2.6× the cleanest month (July, 35 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 90 | 80 | 76 | 66 | 49 | 37 | 35 | 40 | 59 | 74 | 82 | 92 |
| Level | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Poor | Poor | Moderate | Poor | Unhealthy | Unhealthy | Unhealthy | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 90 | Unhealthy |
| Feb | 80 | Unhealthy |
| Mar | 76 | Unhealthy |
| Apr | 66 | Unhealthy |
| May | 49 | Poor |
| Jun | 37 | Poor |
| Jul | 35 | Moderate |
| Aug | 40 | Poor |
| Sep | 59 | Unhealthy |
| Oct | 74 | Unhealthy |
| Nov | 82 | Unhealthy |
| Dec | 92 | Unhealthy |
Growing season
Thành Phố Uông Bí is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 100 | 0 |
| Dec | 100 | 0 |
Growing degree days
Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Thành Phố Uông Bí banks about 5,158 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around June.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 213 | 230 | 335 | 437 | 549 | 581 | 598 | 582 | 533 | 478 | 364 | 259 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 213 |
| Feb | 230 |
| Mar | 335 |
| Apr | 437 |
| May | 549 |
| Jun | 581 |
| Jul | 598 |
| Aug | 582 |
| Sep | 533 |
| Oct | 478 |
| Nov | 364 |
| Dec | 259 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
Thành Phố Uông Bí receives about 3.9 kWh/m² a day of solar energy on average — moderate — with a clear seasonal swing between 2.4 and 5.0 kWh/m².
The brighter stretch of the year lasts 6.8 months, from around Apr 7 to Oct 31. The brightest month is July, averaging about 4.9 kWh/m² (bright).
The dimmest month is January, down near 2.5 kWh/m² — roughly 50% less than the July peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 2.4 | 2.7 | 3.2 | 4.4 | 5.0 | 5.0 | 4.9 | 4.5 | 4.5 | 4.2 | 3.4 | 2.8 |
| Level | Moderate | Moderate | Moderate | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 2.4 | Moderate |
| Feb | 2.7 | Moderate |
| Mar | 3.2 | Moderate |
| Apr | 4.4 | Bright |
| May | 5.0 | Bright |
| Jun | 5.0 | Bright |
| Jul | 4.9 | Bright |
| Aug | 4.5 | Bright |
| Sep | 4.5 | Bright |
| Oct | 4.2 | Bright |
| Nov | 3.4 | Moderate |
| Dec | 2.8 | Moderate |
Where is Thành Phố Uông Bí?
Thành Phố Uông Bí sits at 21.0°N, 106.8°E, 11 m above sea level, in Vietnam. The nearest listed city is Thị Trấn Mạo Khê, 19 km away.
Topography around Thành Phố Uông Bí
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Thành Phố Uông Bí.
Within 3 km, the terrain around Thành Phố Uông Bí has only modest variations in elevation — a maximum elevation change of 231 m around an average of 20 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 1,047 m; within 80 km, large variations in elevation — a maximum elevation change of 1,180 m.
The land around Thành Phố Uông Bí is covered by trees (41%) and artificial surfaces (24%) within 3 km, trees (55%) within 16 km, and trees (45%) and water (26%) within 80 km.
Vietnam travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type A / B / C / F
- 220 V · 50 Hz
- Prices
- ≈ 29% of US
- price level, 2025
- GDP per capita
- $5,066
- 2025
- Happiness
- 6.4 / 10
- World Happiness, 2025
- Safe drinking water
- 59%
- of population, 2024
- Homicide rate
- 1.5
- per 100k, 2011
- Road deaths
- 30.6
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Moderate
- EF EPI 500
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Thành Phố Uông Bí (21.0343°, 106.7705°, elevation 11 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).