Climate averages 1991–2020
Kolkata weather
in September.
A hot, very wet month: the 7th 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 Kolkata: daytime highs average 30.8°C and nights cool to about 25.4°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 250 mm of rain on roughly 25 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 Howrah (5 km away). In September its highs average 30.8°C, about as warm as Kolkata, with 250 mm of rain.
Among the 692 cities listed in India, Kolkata ranks joint 342nd of 692 for the warmest September highs and joint 630th of 692 for the driest September (rainfall, lowest first). The mean September high of those 692 cities is 30.7°C; Kolkata is 0.1°C warmer than that mean.
From September to October, average highs fall by 0.6°C to 30.2°C, and monthly rainfall falls from 250 mm to 131 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
Kolkata climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.0°C13.2°C | 13.2°C | 13 | 1.7 | 10.911 h |
| February | 28.5°C16.7°C | 16.7°C | 24 | 2.6 | 11.411 h |
| March | 33.0°C21.6°C | 21.6°C | 30 | 4.2 | 12.012 h |
| April | 35.2°C25.3°C | 25.3°C | 68 | 8.6 | 12.713 h |
| May | 34.9°C26.9°C | 26.9°C | 122 | 11.7 | 13.213 h |
| June | 32.8°C27.1°C | 27.1°C | 265 | 21.8 | 13.513 h |
| July | 31.1°C26.2°C | 26.2°C | 348 | 28.6 | 13.413 h |
| August | 30.9°C25.9°C | 25.9°C | 308 | 29.2 | 12.913 h |
| September, selected | 30.8°C25.4°C | 25.4°C | 250 | 24.9 | 12.312 h |
| October | 30.2°C23.3°C | 23.3°C | 131 | 12.9 | 11.612 h |
| November | 28.4°C18.7°C | 18.7°C | 29 | 2.1 | 11.111 h |
| December | 25.7°C14.5°C | 14.5°C | 10 | 1.0 | 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
- Howrah in SeptemberIndia · 5 kmHigh 30.8°C · Low 25.4°C · 250 mm rain
- Maheshtala in SeptemberIndia · 13 kmHigh 30.8°C · Low 25.4°C · 250 mm rain
- Pānihāti in SeptemberIndia · 14 kmHigh 30.8°C · Low 25.3°C · 242 mm rain
- Rajpur Sonarpur in SeptemberIndia · 16 kmHigh 30.7°C · Low 25.4°C · 244 mm rain
- Rishra in SeptemberIndia · 18 kmHigh 30.9°C · Low 25.3°C · 242 mm rain
- Budge Budge in SeptemberIndia · 21 kmHigh 30.8°C · Low 25.4°C · 250 mm rain
- Shrīrāmpur in SeptemberIndia · 21 kmHigh 30.9°C · Low 25.2°C · 242 mm rain
- Bārāsat in SeptemberIndia · 21 kmHigh 30.8°C · Low 25.4°C · 240 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 Kolkata) is explained once on the Kolkata year overview and on the Sources, method and limits page.
Howrah, Maheshtala and Budge Budge lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.