Climate averages 1991–2020
Chattogram weather
in September.
A hot, very wet month: the joint 5th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Chattogram: daytime highs average 29.0°C and nights cool to about 25.4°C. By daytime temperature it is the joint 5th warmest of the 12 months.
Expect about 340 mm of rain on roughly 26 days, which makes September a very wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 18 min on an average September day.
The nearest other city in this atlas is Hāthazāri (19 km away). In September its highs average 29.3°C, about as warm as Chattogram, with 346 mm of rain.
Among the 63 cities listed in Bangladesh, Chattogram ranks 62nd of 63 for the warmest September highs and 58th of 63 for the driest September (rainfall, lowest first). The mean September high of those 63 cities is 30.5°C; Chattogram is 1.5°C cooler than that mean.
From September to October, average highs stay level at 29.0°C, and monthly rainfall falls from 340 mm to 203 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Chattogram climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 23.9°C15.8°C | 15.8°C | 6.2 | 0.8 | 10.911 h |
| February | 26.4°C18.0°C | 18.0°C | 14 | 1.8 | 11.411 h |
| March | 29.4°C22.1°C | 22.1°C | 46 | 4.4 | 12.012 h |
| April | 30.5°C25.0°C | 25.0°C | 98 | 9.4 | 12.713 h |
| May | 30.3°C26.0°C | 26.0°C | 291 | 20.5 | 13.213 h |
| June | 29.2°C26.0°C | 26.0°C | 583 | 26.8 | 13.513 h |
| July | 28.5°C25.6°C | 25.6°C | 606 | 29.3 | 13.413 h |
| August | 28.7°C25.6°C | 25.6°C | 454 | 28.7 | 12.913 h |
| September, selected | 29.0°C25.4°C | 25.4°C | 340 | 25.6 | 12.312 h |
| October | 29.0°C24.5°C | 24.5°C | 203 | 17.3 | 11.712 h |
| November | 27.3°C21.1°C | 21.1°C | 48 | 3.9 | 11.111 h |
| December | 24.7°C17.4°C | 17.4°C | 12 | 1.2 | 10.811 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Hāthazāri in SeptemberBangladesh · 19 kmHigh 29.3°C · Low 25.3°C · 346 mm rain
- Bibir Hat in SeptemberBangladesh · 39 kmHigh 29.6°C · Low 25.0°C · 321 mm rain
- Rangamati in SeptemberBangladesh · 50 kmHigh 30.3°C · Low 24.5°C · 243 mm rain
- Karnaphuli in SeptemberBangladesh · 57 kmHigh 30.1°C · Low 24.7°C · 243 mm rain
- Feni in SeptemberBangladesh · 87 kmHigh 30.0°C · Low 24.8°C · 292 mm rain
- Maijdi in SeptemberBangladesh · 95 kmHigh 30.0°C · Low 25.0°C · 296 mm rain
- Cox’s Bāzār in SeptemberBangladesh · 102 kmHigh 28.8°C · Low 25.1°C · 341 mm rain
- Lākshām in SeptemberBangladesh · 124 kmHigh 30.3°C · Low 24.9°C · 264 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Chattogram) is explained once on the Chattogram year overview and on the Sources, method and limits page.