Climate and average weather in Chittagong
In Chittagong, the summers are oppressive, hot, wet, and mostly clear and the winters are warm and clear.
Over the course of the year, the temperature in Chittagong typically varies from 18°C to 30°C, and is rarely below 16°C or above 31°C. May is the hottest month of the year, while January is the coldest.
Based on the travel score, the best times of year to visit Chittagong for warm-weather activities are from early January to mid March and mid November to late December.
- Hottest
- May
- 30°
- Coldest
- Jan
- 18°
- Wettest
- Jul
- 606 mm
- Driest
- Jan
- 6 mm
- Rain / yr
- 2703 mm
- 170 wet days
- Daylight
- 10.6–13.4 h
- shortest–longest
- Elevation
- 15 m
- 22.3°N
- Clearest
- Jan
- 14% cloud
Chittagong is second largest city of Bangladesh, situated at the southwestern part of the country.
- Air quality
- Severe
- PM2.5 56.4 µg/m³ · 2018
- Density
- 24,351/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Chittagong 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 mid March.
Temperature through the year
Daily average highs and lows in Chittagong, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
Temperatures in Chittagong stay fairly even through the year, without a distinct hot or cool season. The warmest month is May, with an average high of 30°C and low of 27°C; the coolest is January, with an average low of 18°C and high of 23°C.
Days typically run about 4°C warmer than nights, with the widest day–night swing (around 6°C) in January.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 23 | 25 | 28 | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 27 | 25 |
| Avg low (°C) | 18 | 20 | 24 | 26 | 27 | 27 | 27 | 27 | 27 | 26 | 23 | 19 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 23 | 18 |
| Feb | 25 | 20 |
| Mar | 28 | 24 |
| Apr | 29 | 26 |
| May | 30 | 27 |
| Jun | 29 | 27 |
| Jul | 29 | 27 |
| Aug | 29 | 27 |
| Sep | 29 | 27 |
| Oct | 29 | 26 |
| Nov | 27 | 23 |
| Dec | 25 | 19 |
How hot and cold Chittagong 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, Chittagong feels like about 37°C (around May 16). About 217 days a year carry some heat stress, peaking in May.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 23 | 25 | 30 | 35 | 37 | 36 | 35 | 35 | 35 | 34 | 29 | 25 |
| Air high (°C) | 23 | 25 | 28 | 29 | 30 | 29 | 29 | 29 | 29 | 29 | 27 | 25 |
| Feels-like low (°C) | 18 | 20 | 24 | 26 | 27 | 27 | 27 | 27 | 27 | 26 | 23 | 19 |
| Air low (°C) | 18 | 20 | 24 | 26 | 27 | 27 | 27 | 27 | 27 | 26 | 23 | 19 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 23 | 23 | 18 | 18 |
| Feb | 25 | 25 | 20 | 20 |
| Mar | 30 | 28 | 24 | 24 |
| Apr | 35 | 29 | 26 | 26 |
| May | 37 | 30 | 27 | 27 |
| Jun | 36 | 29 | 27 | 27 |
| Jul | 35 | 29 | 27 | 27 |
| Aug | 35 | 29 | 27 | 27 |
| Sep | 35 | 29 | 27 | 27 |
| Oct | 34 | 29 | 26 | 26 |
| Nov | 29 | 27 | 23 | 23 |
| Dec | 25 | 25 | 19 | 19 |
Average hourly temperature in Chittagong
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 May afternoons, near 30°C, and coldest before dawn in January, near 18°C.
Chittagong 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 | 23° / 18° | 6 | 0.8 | 10.8 | 9.3 |
| Feb | 25° / 20° | 14 | 1.8 | 11.2 | 9.0 |
| Mar | 28° / 24° | 46 | 4.4 | 11.8 | 7.6 |
| Apr | 29° / 26° | 98 | 9.4 | 12.5 | 5.7 |
| May | 30° / 27° | 291 | 20.5 | 13.1 | 4.1 |
| Jun | 29° / 27° | 583 | 26.8 | 13.3 | 3.1 |
| Jul | 29° / 27° | 606 | 29.3 | 13.2 | 3.0 |
| Aug | 29° / 27° | 454 | 28.7 | 12.8 | 3.1 |
| Sep | 29° / 27° | 340 | 25.6 | 12.1 | 3.3 |
| Oct | 29° / 26° | 203 | 17.3 | 11.5 | 4.8 |
| Nov | 27° / 23° | 48 | 3.9 | 10.9 | 7.8 |
| Dec | 25° / 19° | 12 | 1.2 | 10.7 | 9.1 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Chittagong gets about 2703 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 5.7 months, from around Apr 30 to Oct 20, peaking in July at about 95% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jan 13.
July is the wettest month by volume, with 606 mm over about 29 wet days; January is the driest, with 6 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 3 | 6 | 15 | 33 | 65 | 89 | 94 | 92 | 85 | 55 | 14 | 4 |
| Rain days | 1 | 2 | 4 | 9 | 21 | 27 | 29 | 29 | 26 | 17 | 4 | 1 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 3 | 1 |
| Feb | 6 | 2 |
| Mar | 15 | 4 |
| Apr | 33 | 9 |
| May | 65 | 21 |
| Jun | 89 | 27 |
| Jul | 94 | 29 |
| Aug | 92 | 29 |
| Sep | 85 | 26 |
| Oct | 55 | 17 |
| Nov | 14 | 4 |
| Dec | 4 | 1 |
Monthly rainfall
Over a full year, Chittagong collects about 2703 mm of rain across 170 wet days — roughly 225 mm in an average month.
It doesn’t fall evenly. July is the wettest month with 606 mm, while January is the driest at just 6 mm. The three wettest months alone bring about 61% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 6 | 14 | 46 | 98 | 291 | 583 | 606 | 454 | 340 | 203 | 48 | 12 |
| Rain days | 1 | 2 | 4 | 9 | 21 | 27 | 29 | 29 | 26 | 17 | 4 | 1 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 6 | 1 |
| Feb | 14 | 2 |
| Mar | 46 | 4 |
| Apr | 98 | 9 |
| May | 291 | 21 |
| Jun | 583 | 27 |
| Jul | 606 | 29 |
| Aug | 454 | 29 |
| Sep | 340 | 26 |
| Oct | 203 | 17 |
| Nov | 48 | 4 |
| Dec | 12 | 1 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Chittagong, 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 October 15 and lasts for 7.2 months, ending around May 22. The clearest month is January, when the sky is clear, mostly clear, or partly cloudy 92% of the time on average.
The cloudier part of the year begins around May 23 and lasts for 4.8 months, ending around October 14. The cloudiest month is August, when it is overcast or mostly cloudy 96% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 92 | 91 | 88 | 83 | 63 | 16 | 4 | 4 | 17 | 56 | 80 | 88 |
| Cloudier (%) | 8 | 9 | 12 | 17 | 37 | 84 | 96 | 96 | 83 | 44 | 20 | 12 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 92 | 8 |
| Feb | 91 | 9 |
| Mar | 88 | 12 |
| Apr | 83 | 17 |
| May | 63 | 37 |
| Jun | 16 | 84 |
| Jul | 4 | 96 |
| Aug | 4 | 96 |
| Sep | 17 | 83 |
| Oct | 56 | 44 |
| Nov | 80 | 20 |
| Dec | 88 | 12 |
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 14, brings about 13 h 24 min of light; the shortest, around December 14, only 10 h 36 min — a swing of roughly 2 h 48 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.8 | 11.2 | 11.8 | 12.5 | 13.1 | 13.3 | 13.2 | 12.8 | 12.1 | 11.5 | 10.9 | 10.7 |
| Sunrise (AM) | 6:39 | 6:30 | 6:07 | 5:37 | 5:17 | 5:12 | 5:21 | 5:33 | 5:43 | 5:53 | 6:11 | 6:30 |
| Sunset (PM) | 5:25 | 5:44 | 5:58 | 6:08 | 6:21 | 6:34 | 6:36 | 6:20 | 5:51 | 5:22 | 5:05 | 5:08 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 10.8 | 6:39 | 5:25 |
| Feb | 11.2 | 6:30 | 5:44 |
| Mar | 11.8 | 6:07 | 5:58 |
| Apr | 12.5 | 5:37 | 6:08 |
| May | 13.1 | 5:17 | 6:21 |
| Jun | 13.3 | 5:12 | 6:34 |
| Jul | 13.2 | 5:21 | 6:36 |
| Aug | 12.8 | 5:33 | 6:20 |
| Sep | 12.1 | 5:43 | 5:51 |
| Oct | 11.5 | 5:53 | 5:22 |
| Nov | 10.9 | 6:11 | 5:05 |
| Dec | 10.7 | 6:30 | 5:08 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Chittagong averages about 15 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 0 and 27 days.
The sunnier stretch runs 7.0 months, from around Oct 16 to May 17. The sunniest month is January, with roughly 26 sunny days (brilliant).
The greyest month is August, down near 0 sunny days — about 99% fewer than the January peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 27 | 24 | 25 | 21 | 15 | 3 | 0 | 0 | 2 | 14 | 22 | 25 |
| Sky | Brilliant | Brilliant | Brilliant | Bright | Mixed | Gloomy | Gloomy | Gloomy | Gloomy | Mixed | Bright | Brilliant |
| Sunny days | Sky | |
|---|---|---|
| Jan | 27 | Brilliant |
| Feb | 24 | Brilliant |
| Mar | 25 | Brilliant |
| Apr | 21 | Bright |
| May | 15 | Mixed |
| Jun | 3 | Gloomy |
| Jul | 0 | Gloomy |
| Aug | 0 | Gloomy |
| Sep | 2 | Gloomy |
| Oct | 14 | Mixed |
| Nov | 22 | Bright |
| Dec | 25 | Brilliant |
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 Chittagong, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 9.2 months, from around March 3 to December 8. The muggiest month is March, when the air feels humid, muggy or worse about 97% of the time.
The most comfortable stretch runs from around December 9 to March 2, and January is the most comfortable month — the air is dry or comfortable 48% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 9 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
| Comfortable (%) | 39 | 19 | 3 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 18 |
| Humid (%) | 45 | 39 | 12 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 13 | 50 |
| Muggy (%) | 7 | 27 | 22 | 1 | 0 | 0 | 0 | 0 | 0 | 4 | 43 | 28 |
| Oppressive (%) | 0 | 11 | 51 | 33 | 6 | 0 | 0 | 0 | 1 | 29 | 36 | 2 |
| Miserable (%) | 0 | 0 | 12 | 65 | 94 | 100 | 100 | 100 | 99 | 67 | 7 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| Jan | 9 | 39 | 45 | 7 | 0 | 0 |
| Feb | 4 | 19 | 39 | 27 | 11 | 0 |
| Mar | 0 | 3 | 12 | 22 | 51 | 12 |
| Apr | 0 | 0 | 0 | 1 | 33 | 65 |
| May | 0 | 0 | 0 | 0 | 6 | 94 |
| Jun | 0 | 0 | 0 | 0 | 0 | 100 |
| Jul | 0 | 0 | 0 | 0 | 0 | 100 |
| Aug | 0 | 0 | 0 | 0 | 0 | 100 |
| Sep | 0 | 0 | 0 | 0 | 1 | 99 |
| Oct | 0 | 0 | 0 | 4 | 29 | 67 |
| Nov | 0 | 1 | 13 | 43 | 36 | 7 |
| Dec | 1 | 18 | 50 | 28 | 2 | 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 Chittagong is typically light breeze, near 15 km/h, and varies a lot with the seasons.
The windier part of the year lasts 5.2 months, from around Apr 12 to Sep 16. The windiest month is July, averaging about 22 km/h (breezy).
The calmer part of the year runs from around Sep 17 to Apr 11, with November the calmest month at about 9 km/h.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 11 | 12 | 13 | 15 | 17 | 21 | 22 | 20 | 15 | 10 | 9 | 10 |
| Feels | calm | calm | light breeze | light breeze | light breeze | breezy | breezy | light breeze | light breeze | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 11 | calm |
| Feb | 12 | calm |
| Mar | 13 | light breeze |
| Apr | 15 | light breeze |
| May | 17 | light breeze |
| Jun | 21 | breezy |
| Jul | 22 | breezy |
| Aug | 20 | light breeze |
| Sep | 15 | light breeze |
| Oct | 10 | calm |
| Nov | 9 | calm |
| Dec | 10 | calm |
Hazard calendar for Chittagong
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
Chittagong sits in the North Indian Ocean cyclone zone; the season peaks May and October–November.
Chittagong's monsoon runs May–September, when most of the year's rain falls.
Best time to visit Chittagong
To characterize how pleasant the weather is in Chittagong throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around early March, Chittagong 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 Chittagong for general outdoor tourist activities is from mid November to mid March, with a peak score in the last week of January.
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) | 9.3 | 9.0 | 7.6 | 5.7 | 4.2 | 3.1 | 3.0 | 3.1 | 3.3 | 4.8 | 7.7 | 9.1 |
| Rating | ideal | ideal | ideal | good | fair | poor | poor | poor | poor | fair | ideal | ideal |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 9.3 | ideal |
| Feb | 9.0 | ideal |
| Mar | 7.6 | ideal |
| Apr | 5.7 | good |
| May | 4.2 | fair |
| Jun | 3.1 | poor |
| Jul | 3.0 | poor |
| Aug | 3.1 | poor |
| Sep | 3.3 | poor |
| Oct | 4.8 | fair |
| Nov | 7.7 | ideal |
| Dec | 9.1 | ideal |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit Chittagong for hot-weather activities is from late October to late April, with a peak score in the second week of March.
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 Chittagong, 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 May (highs near 30°C), the essentials are light clothes, rain gear and sun protection. In the cold season around January (highs near 23°C), pack light clothes and sun protection.
In May, Chittagong sees daytime highs around 30°C and nights near 27°C. Pack light clothes and rain gear. Worth having: sun protection. About 21 days see rain.
Sea temperature near Chittagong
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 22 km away) is warmest in October at about 29°C and coldest in January near 22°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) | 22 | 23 | 26 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 27 | 24 |
| Comfort | Refreshing | Refreshing | Warm | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Warm | Refreshing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 22 | Refreshing |
| Feb | 23 | Refreshing |
| Mar | 26 | Warm |
| Apr | 28 | Tropical |
| May | 29 | Tropical |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 27 | Warm |
| Dec | 24 | Refreshing |
UV index (midday) in Chittagong 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 Chittagong peaks around July 21 at about 13 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 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) | 6 | 7 | 8 | 8 | 10 | 8 | 13 | 11 | 9 | 6 | 7 | 6 |
| Level | High | High | Very high | Very high | Extreme | Very high | Extreme | Extreme | Very high | High | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 6 | High |
| Feb | 7 | High |
| Mar | 8 | Very high |
| Apr | 8 | Very high |
| May | 10 | Extreme |
| Jun | 8 | Very high |
| Jul | 13 | Extreme |
| Aug | 11 | Extreme |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 7 | High |
| Dec | 6 | High |
Average hourly UV index in Chittagong
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) | 5.5 | 6 | 7 | 7 | 8 | 7.5 | 8.5 | 8 | 7.5 | 5.5 | 5.5 | 5 |
| UV ≥ 6 (h/day) | 0 | 2 | 4 | 4 | 5.5 | 4.5 | 6.5 | 6 | 5 | 1.5 | 2 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 5.5 | 0 |
| Feb | 6 | 2 |
| Mar | 7 | 4 |
| Apr | 7 | 4 |
| May | 8 | 5.5 |
| Jun | 7.5 | 4.5 |
| Jul | 8.5 | 6.5 |
| Aug | 8 | 6 |
| Sep | 7.5 | 5 |
| Oct | 5.5 | 1.5 |
| Nov | 5.5 | 2 |
| Dec | 5 | 0 |
Air quality in Chittagong 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 Chittagong is worst in January — around 117 µg/m³ PM2.5 (unhealthy), about 5.3× the cleanest month (July, 22 µg/m³).
Seasonal pattern from CAMS reanalysis, scaled to Chittagong's WHO annual average of 56.4 µg/m³.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 117 | 92 | 79 | 49 | 34 | 27 | 22 | 26 | 26 | 43 | 67 | 95 |
| Level | Unhealthy | Unhealthy | Unhealthy | Poor | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Unhealthy | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 117 | Unhealthy |
| Feb | 92 | Unhealthy |
| Mar | 79 | Unhealthy |
| Apr | 49 | Poor |
| May | 34 | Moderate |
| Jun | 27 | Moderate |
| Jul | 22 | Moderate |
| Aug | 26 | Moderate |
| Sep | 26 | Moderate |
| Oct | 43 | Poor |
| Nov | 67 | Unhealthy |
| Dec | 95 | Unhealthy |
Growing season
Chittagong 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. Chittagong banks about 5,774 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around May.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 322 | 348 | 486 | 531 | 567 | 539 | 544 | 544 | 531 | 540 | 454 | 369 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 322 |
| Feb | 348 |
| Mar | 486 |
| Apr | 531 |
| May | 567 |
| Jun | 539 |
| Jul | 544 |
| Aug | 544 |
| Sep | 531 |
| Oct | 540 |
| Nov | 454 |
| Dec | 369 |
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.
Chittagong receives about 4.8 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 3.8 and 6.2 kWh/m².
The brighter stretch of the year lasts 4.5 months, from around Jan 18 to Jun 2. The brightest month is April, averaging about 6.1 kWh/m² (intense).
The dimmest month is July, down near 3.9 kWh/m² — roughly 36% less than the April peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.8 | 5.4 | 6.0 | 6.2 | 5.5 | 4.2 | 3.9 | 4.1 | 4.3 | 4.4 | 4.5 | 4.3 |
| Level | Bright | Bright | Intense | Intense | Bright | Bright | Moderate | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 4.8 | Bright |
| Feb | 5.4 | Bright |
| Mar | 6.0 | Intense |
| Apr | 6.2 | Intense |
| May | 5.5 | Bright |
| Jun | 4.2 | Bright |
| Jul | 3.9 | Moderate |
| Aug | 4.1 | Bright |
| Sep | 4.3 | Bright |
| Oct | 4.4 | Bright |
| Nov | 4.5 | Bright |
| Dec | 4.3 | Bright |
Where is Chittagong?
Chittagong sits at 22.3°N, 91.8°E, 15 m above sea level, in Bangladesh. The nearest listed city is Cox's Bazar, 102 km away.
What Chittagong looks like
Topography around Chittagong
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Chittagong.
Within 3 km, the terrain around Chittagong has only modest variations in elevation — a maximum elevation change of 60 m around an average of 12 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 96 m; within 80 km, large variations in elevation — a maximum elevation change of 893 m.
The land around Chittagong is covered by artificial surfaces (62%) and trees (22%) within 3 km, trees (43%) and water (27%) within 16 km, and trees (53%) and water (33%) within 80 km.
Bangladesh travel facts
- Travel advisory
- Level 3
- Reconsider Travel
- Power plugs
- Type A / C / D / G
- 220 V · 50 Hz
- Prices
- ≈ 25% of US
- price level, 2025
- GDP per capita
- $2,597
- 2025
- Happiness
- 4.3 / 10
- World Happiness, 2025
- Safe drinking water
- 59%
- of population, 2024
- Homicide rate
- 2.3
- per 100k, 2018
- Road deaths
- 15.3
- per 100k/yr, 2019
- Income group
- Lower middle
- World Bank
- English
- Moderate
- EF EPI 506
- 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 Chittagong (22.3384°, 91.8317°, elevation 15 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).