Climate and average weather in Sông Cầu
In Sông Cầu, the summers are oppressive, hot, wet, and mostly cloudy and the winters are warm and partly cloudy.
Over the course of the year, the temperature in Sông Cầu typically varies from 22°C to 31°C, and is rarely below 20°C or above 33°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 Sông Cầu for warm-weather activities is from early January to late April.
- Hottest
- Jun
- 31°
- Coldest
- Jan
- 22°
- Wettest
- Nov
- 410 mm
- Driest
- Feb
- 53 mm
- Rain / yr
- 1955 mm
- 207 wet days
- Daylight
- 11.2–12.8 h
- shortest–longest
- Elevation
- 10 m
- 13.5°N
- Clearest
- Mar
- 46% cloud
Sông Cầu 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 early January to late April.
Temperature through the year
Daily average highs and lows in Sông Cầu, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
Temperatures in Sông Cầu stay fairly even through the year, without a distinct hot or cool season. The warmest month is June, with an average high of 31°C and low of 27°C; the coolest is January, with an average low of 22°C and high of 24°C.
Days typically run about 4°C warmer than nights year-round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 24 | 25 | 27 | 29 | 30 | 31 | 31 | 31 | 30 | 28 | 26 | 25 |
| Avg low (°C) | 22 | 22 | 23 | 25 | 26 | 27 | 27 | 27 | 26 | 25 | 24 | 23 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 24 | 22 |
| Feb | 25 | 22 |
| Mar | 27 | 23 |
| Apr | 29 | 25 |
| May | 30 | 26 |
| Jun | 31 | 27 |
| Jul | 31 | 27 |
| Aug | 31 | 27 |
| Sep | 30 | 26 |
| Oct | 28 | 25 |
| Nov | 26 | 24 |
| Dec | 25 | 23 |
How hot and cold Sông Cầu 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, Sông Cầu feels like about 38°C (around June 1). About 182 days a year carry some heat stress, peaking in June.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 24 | 25 | 28 | 33 | 37 | 38 | 36 | 36 | 35 | 31 | 26 | 25 |
| Air high (°C) | 24 | 25 | 27 | 29 | 30 | 31 | 31 | 31 | 30 | 28 | 26 | 25 |
| Feels-like low (°C) | 22 | 22 | 23 | 25 | 26 | 27 | 27 | 27 | 26 | 25 | 24 | 22 |
| Air low (°C) | 22 | 22 | 23 | 25 | 26 | 27 | 27 | 27 | 26 | 25 | 24 | 23 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 24 | 24 | 22 | 22 |
| Feb | 25 | 25 | 22 | 22 |
| Mar | 28 | 27 | 23 | 23 |
| Apr | 33 | 29 | 25 | 25 |
| May | 37 | 30 | 26 | 26 |
| Jun | 38 | 31 | 27 | 27 |
| Jul | 36 | 31 | 27 | 27 |
| Aug | 36 | 31 | 27 | 27 |
| Sep | 35 | 30 | 26 | 26 |
| Oct | 31 | 28 | 25 | 25 |
| Nov | 26 | 26 | 24 | 24 |
| Dec | 25 | 25 | 22 | 23 |
Average hourly temperature in Sông Cầu
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 31°C, and coldest before dawn in January, near 22°C.
Sông Cầu 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 | 24° / 22° | 105 | 16.3 | 11.3 | 5.9 |
| Feb | 25° / 22° | 53 | 10.5 | 11.6 | 6.7 |
| Mar | 27° / 23° | 60 | 10.4 | 11.9 | 6.7 |
| Apr | 29° / 25° | 64 | 10.6 | 12.3 | 5.7 |
| May | 30° / 26° | 147 | 18.2 | 12.6 | 3.9 |
| Jun | 31° / 27° | 86 | 16.1 | 12.8 | 3.5 |
| Jul | 31° / 27° | 79 | 14.7 | 12.7 | 3.8 |
| Aug | 31° / 27° | 98 | 15.5 | 12.4 | 3.6 |
| Sep | 30° / 26° | 215 | 22.3 | 12.1 | 3.3 |
| Oct | 28° / 25° | 361 | 26.4 | 11.7 | 3.8 |
| Nov | 26° / 24° | 410 | 23.8 | 11.4 | 4.4 |
| Dec | 25° / 23° | 278 | 22.4 | 11.2 | 4.8 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Sông Cầu gets about 1955 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 4.3 months, from around Aug 26 to Jan 4, peaking in October at about 85% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Mar 9.
November is the wettest month by volume, with 410 mm over about 24 wet days; February is the driest, with 53 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 52 | 38 | 34 | 36 | 57 | 55 | 47 | 50 | 75 | 84 | 80 | 72 |
| Rain days | 16 | 11 | 10 | 11 | 18 | 16 | 15 | 16 | 22 | 26 | 24 | 22 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 52 | 16 |
| Feb | 38 | 11 |
| Mar | 34 | 10 |
| Apr | 36 | 11 |
| May | 57 | 18 |
| Jun | 55 | 16 |
| Jul | 47 | 15 |
| Aug | 50 | 16 |
| Sep | 75 | 22 |
| Oct | 84 | 26 |
| Nov | 80 | 24 |
| Dec | 72 | 22 |
Monthly rainfall
Over a full year, Sông Cầu collects about 1955 mm of rain across 207 wet days — roughly 163 mm in an average month.
It doesn’t fall evenly. November is the wettest month with 410 mm, while February is the driest at just 53 mm. The three wettest months alone bring about 54% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 105 | 53 | 60 | 64 | 147 | 86 | 79 | 98 | 215 | 361 | 410 | 278 |
| Rain days | 16 | 11 | 10 | 11 | 18 | 16 | 15 | 16 | 22 | 26 | 24 | 22 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 105 | 16 |
| Feb | 53 | 11 |
| Mar | 60 | 10 |
| Apr | 64 | 11 |
| May | 147 | 18 |
| Jun | 86 | 16 |
| Jul | 79 | 15 |
| Aug | 98 | 16 |
| Sep | 215 | 22 |
| Oct | 361 | 26 |
| Nov | 410 | 24 |
| Dec | 278 | 22 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Sông Cầu, 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 January 8 and lasts for 4.1 months, ending around May 12. The clearest month is March, when the sky is clear, mostly clear, or partly cloudy 68% of the time on average.
The cloudier part of the year begins around May 13 and lasts for 5.9 months, ending around November 7. The cloudiest month is September, when it is overcast or mostly cloudy 81% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 40 | 59 | 68 | 62 | 36 | 27 | 27 | 22 | 19 | 30 | 37 | 30 |
| Cloudier (%) | 60 | 41 | 32 | 38 | 64 | 73 | 73 | 78 | 81 | 70 | 63 | 70 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 40 | 60 |
| Feb | 59 | 41 |
| Mar | 68 | 32 |
| Apr | 62 | 38 |
| May | 36 | 64 |
| Jun | 27 | 73 |
| Jul | 27 | 73 |
| Aug | 22 | 78 |
| Sep | 19 | 81 |
| Oct | 30 | 70 |
| Nov | 37 | 63 |
| Dec | 30 | 70 |
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 5, brings about 12 h 48 min of light; the shortest, around January 1, only 11 h 12 min — a swing of roughly 1 h 36 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 11.3 | 11.6 | 11.9 | 12.3 | 12.6 | 12.8 | 12.7 | 12.4 | 12.1 | 11.7 | 11.4 | 11.2 |
| Sunrise (AM) | 6:14 | 6:11 | 5:56 | 5:34 | 5:21 | 5:20 | 5:27 | 5:34 | 5:35 | 5:37 | 5:47 | 6:03 |
| Sunset (PM) | 5:31 | 5:44 | 5:50 | 5:52 | 5:58 | 6:07 | 6:10 | 6:01 | 5:40 | 5:19 | 5:09 | 5:16 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 11.3 | 6:14 | 5:31 |
| Feb | 11.6 | 6:11 | 5:44 |
| Mar | 11.9 | 5:56 | 5:50 |
| Apr | 12.3 | 5:34 | 5:52 |
| May | 12.6 | 5:21 | 5:58 |
| Jun | 12.8 | 5:20 | 6:07 |
| Jul | 12.7 | 5:27 | 6:10 |
| Aug | 12.4 | 5:34 | 6:01 |
| Sep | 12.1 | 5:35 | 5:40 |
| Oct | 11.7 | 5:37 | 5:19 |
| Nov | 11.4 | 5:47 | 5:09 |
| Dec | 11.2 | 6:03 | 5:16 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Sông Cầu averages about 6 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 2 and 15 days.
The sunnier stretch runs 3.5 months, from around Jan 29 to May 15. The sunniest month is March, with roughly 14 sunny days (mixed).
The greyest month is September, down near 3 sunny days — about 81% fewer than the March peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 5 | 9 | 14 | 13 | 7 | 4 | 5 | 3 | 3 | 4 | 5 | 3 |
| Sky | Gloomy | Mixed | Mixed | Mixed | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy | Gloomy |
| Sunny days | Sky | |
|---|---|---|
| Jan | 5 | Gloomy |
| Feb | 9 | Mixed |
| Mar | 14 | Mixed |
| Apr | 13 | Mixed |
| May | 7 | Gloomy |
| Jun | 4 | Gloomy |
| Jul | 5 | Gloomy |
| Aug | 3 | Gloomy |
| Sep | 3 | Gloomy |
| Oct | 4 | Gloomy |
| Nov | 5 | Gloomy |
| Dec | 3 | Gloomy |
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.
Sông Cầu is humid all year round — on a typical day the air feels at least humid, and there is no real dry season to wait for.
The stickiest month is February, when it feels muggy, oppressive or miserable about 87% of the time. Even in January, the mildest month, the air is dry or comfortable only 3% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 3 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Humid (%) | 17 | 12 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | 10 |
| Muggy (%) | 53 | 46 | 22 | 2 | 0 | 0 | 0 | 0 | 0 | 6 | 16 | 39 |
| Oppressive (%) | 28 | 40 | 70 | 53 | 19 | 38 | 64 | 69 | 67 | 74 | 76 | 49 |
| Miserable (%) | 0 | 1 | 6 | 44 | 81 | 62 | 36 | 31 | 33 | 20 | 5 | 1 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|
| Jan | 3 | 17 | 53 | 28 | 0 |
| Feb | 1 | 12 | 46 | 40 | 1 |
| Mar | 0 | 2 | 22 | 70 | 6 |
| Apr | 0 | 0 | 2 | 53 | 44 |
| May | 0 | 0 | 0 | 19 | 81 |
| Jun | 0 | 0 | 0 | 38 | 62 |
| Jul | 0 | 0 | 0 | 64 | 36 |
| Aug | 0 | 0 | 0 | 69 | 31 |
| Sep | 0 | 0 | 0 | 67 | 33 |
| Oct | 0 | 0 | 6 | 74 | 20 |
| Nov | 0 | 3 | 16 | 76 | 5 |
| Dec | 1 | 10 | 39 | 49 | 1 |
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 Sông Cầu is typically light breeze, near 14 km/h, and varies a lot with the seasons.
The windier part of the year lasts 4.2 months, from around Oct 18 to Feb 22. The windiest month is December, averaging about 21 km/h (breezy).
The calmer part of the year runs from around Aug 8 to Oct 17, with September the calmest month at about 10 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 18 | 15 | 12 | 11 | 10 | 12 | 13 | 13 | 10 | 14 | 19 | 21 |
| Feels | light breeze | light breeze | light breeze | calm | calm | light breeze | light breeze | light breeze | calm | light breeze | light breeze | breezy |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 18 | light breeze |
| Feb | 15 | light breeze |
| Mar | 12 | light breeze |
| Apr | 11 | calm |
| May | 10 | calm |
| Jun | 12 | light breeze |
| Jul | 13 | light breeze |
| Aug | 13 | light breeze |
| Sep | 10 | calm |
| Oct | 14 | light breeze |
| Nov | 19 | light breeze |
| Dec | 21 | breezy |
Hazard calendar for Sông Cầu
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
Sông Cầu sits in the Pacific typhoon belt; the season peaks July–October.
Sông Cầu's monsoon runs September–December, when most of the year's rain falls.
Best time to visit Sông Cầu
To characterize how pleasant the weather is in Sông Cầu throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around mid January, Sông Cầu is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.
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 Sông Cầu for general outdoor tourist activities is from early January to late April, with a peak score in the second week of March.
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) | 5.9 | 6.7 | 6.7 | 5.7 | 3.9 | 3.5 | 3.8 | 3.6 | 3.3 | 3.8 | 4.3 | 4.8 |
| Rating | good | good | good | good | fair | fair | fair | fair | poor | fair | fair | fair |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 5.9 | good |
| Feb | 6.7 | good |
| Mar | 6.7 | good |
| Apr | 5.7 | good |
| May | 3.9 | fair |
| Jun | 3.5 | fair |
| Jul | 3.8 | fair |
| Aug | 3.6 | fair |
| Sep | 3.3 | poor |
| Oct | 3.8 | fair |
| Nov | 4.3 | fair |
| Dec | 4.8 | fair |
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 Sông Cầu for hot-weather activities run from early February to mid May and again from mid July to mid August, with a peak score in the third week of April.
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 Sông Cầu, 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 31°C), the essentials are light clothes, rain gear and sun protection. In the cold season around January (highs near 24°C), pack light clothes and rain gear.
In June, Sông Cầu sees daytime highs around 31°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 16 days see rain.
Sea temperature near Sông Cầu
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 19 km away) is warmest in September at about 29°C and coldest in January near 24°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 24 | 24 | 25 | 27 | 28 | 29 | 28 | 29 | 29 | 28 | 27 | 25 |
| Comfort | Warm | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 24 | Warm |
| Feb | 24 | Warm |
| Mar | 25 | Warm |
| Apr | 27 | Warm |
| May | 28 | Tropical |
| Jun | 29 | Tropical |
| Jul | 28 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 28 | Warm |
| Nov | 27 | Warm |
| Dec | 25 | Warm |
UV index (midday) in Sông Cầu 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 Sông Cầu peaks around August 14 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 8 (very 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) | 10 | 12 | 12 | 13 | 12 | 12 | 13 | 13 | 12 | 11 | 9 | 8 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 10 | Very high |
| Feb | 12 | Extreme |
| Mar | 12 | Extreme |
| Apr | 13 | Extreme |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 12 | Extreme |
| Oct | 11 | Extreme |
| Nov | 9 | Very high |
| Dec | 8 | Very high |
Average hourly UV index in Sông Cầu
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 August 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) | 7 | 7.5 | 7.5 | 8 | 8 | 8.5 | 8.5 | 8.5 | 8 | 7.5 | 7 | 6.5 |
| UV ≥ 6 (h/day) | 4.5 | 5.5 | 6 | 6 | 6 | 6.5 | 6.5 | 6.5 | 6 | 5.5 | 4.5 | 3.5 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 7 | 4.5 |
| Feb | 7.5 | 5.5 |
| Mar | 7.5 | 6 |
| Apr | 8 | 6 |
| May | 8 | 6 |
| Jun | 8.5 | 6.5 |
| Jul | 8.5 | 6.5 |
| Aug | 8.5 | 6.5 |
| Sep | 8 | 6 |
| Oct | 7.5 | 5.5 |
| Nov | 7 | 4.5 |
| Dec | 6.5 | 3.5 |
Air quality in Sông Cầu 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 Sông Cầu is worst in April — around 16 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 15 | 14 | 15 | 16 | 15 | 16 | 15 | 16 | 14 | 14 | 13 | 14 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 15 | Moderate |
| Feb | 14 | Moderate |
| Mar | 15 | Moderate |
| Apr | 16 | Moderate |
| May | 15 | Moderate |
| Jun | 16 | Moderate |
| Jul | 15 | Moderate |
| Aug | 16 | Moderate |
| Sep | 14 | Moderate |
| Oct | 14 | Moderate |
| Nov | 13 | Moderate |
| Dec | 14 | Moderate |
Growing season
Sông Cầu 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. Sông Cầu banks about 5,983 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) | 403 | 378 | 466 | 502 | 567 | 571 | 587 | 588 | 541 | 504 | 451 | 424 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 403 |
| Feb | 378 |
| Mar | 466 |
| Apr | 502 |
| May | 567 |
| Jun | 571 |
| Jul | 587 |
| Aug | 588 |
| Sep | 541 |
| Oct | 504 |
| Nov | 451 |
| Dec | 424 |
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.
Sông Cầu receives about 4.9 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.0 and 6.2 kWh/m².
The brighter stretch of the year lasts 6.8 months, from around Feb 23 to Sep 18. The brightest month is April, averaging about 6.1 kWh/m² (intense).
The dimmest month is December, down near 3.1 kWh/m² — roughly 49% less than the April peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.7 | 4.6 | 5.6 | 6.1 | 6.0 | 5.8 | 5.7 | 5.6 | 5.0 | 4.1 | 3.5 | 3.1 |
| Level | Moderate | Bright | Bright | Intense | Bright | Bright | Bright | Bright | Bright | Bright | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 3.7 | Moderate |
| Feb | 4.6 | Bright |
| Mar | 5.6 | Bright |
| Apr | 6.1 | Intense |
| May | 6.0 | Bright |
| Jun | 5.8 | Bright |
| Jul | 5.7 | Bright |
| Aug | 5.6 | Bright |
| Sep | 5.0 | Bright |
| Oct | 4.1 | Bright |
| Nov | 3.5 | Moderate |
| Dec | 3.1 | Moderate |
Where is Sông Cầu?
Sông Cầu sits at 13.5°N, 109.2°E, 10 m above sea level, in Vietnam. The nearest listed city is Qui Nhon, 36 km away.
Topography around Sông Cầu
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Sông Cầu.
Within 3 km, the terrain around Sông Cầu has significant variations in elevation — a maximum elevation change of 317 m around an average of 41 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 830 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,533 m.
The land around Sông Cầu is covered by water (42%) and trees (39%) within 3 km, trees (52%) and water (34%) within 16 km, and trees (46%) and water (35%) 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 Sông Cầu (13.4556°, 109.2235°, elevation 10 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).