Climate averages 1991–2020
Chennai weather
in September.
A hot, 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 Chennai: daytime highs average 32.6°C and nights cool to about 26.0°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 102 mm of rain on roughly 16 days, which makes September a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 13 min on an average September day.
The nearest other city in this atlas is Tiruvottiyūr (8 km away). In September its highs average 32.6°C, about as warm as Chennai, with 94 mm of rain.
Among the 692 cities listed in India, Chennai ranks joint 83rd of 692 for the warmest September highs and joint 154th of 692 for the driest September (rainfall, lowest first). The mean September high of those 692 cities is 30.7°C; Chennai is 2.0°C warmer than that mean.
From September to October, average highs fall by 2.0°C to 30.6°C, and monthly rainfall rises from 102 mm to 208 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
Chennai climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.9°C20.9°C | 20.9°C | 14 | 3.1 | 11.411 h |
| February | 30.1°C21.3°C | 21.3°C | 6.4 | 1.5 | 11.712 h |
| March | 32.7°C23.2°C | 23.2°C | 8.2 | 1.3 | 12.112 h |
| April | 34.7°C26.2°C | 26.2°C | 15 | 2.4 | 12.412 h |
| May | 36.6°C28.1°C | 28.1°C | 38 | 3.8 | 12.713 h |
| June | 35.5°C27.8°C | 27.8°C | 66 | 10.8 | 12.913 h |
| July | 34.2°C27.0°C | 27.0°C | 70 | 13.9 | 12.813 h |
| August | 33.3°C26.4°C | 26.4°C | 94 | 14.7 | 12.613 h |
| September, selected | 32.6°C26.0°C | 26.0°C | 102 | 16.1 | 12.212 h |
| October | 30.6°C24.7°C | 24.7°C | 208 | 19.3 | 11.812 h |
| November | 28.5°C23.4°C | 23.4°C | 227 | 16.4 | 11.512 h |
| December | 27.4°C22.1°C | 22.1°C | 117 | 9.1 | 11.411 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
- Tiruvottiyūr in SeptemberIndia · 8 kmHigh 32.6°C · Low 26.1°C · 94 mm rain
- Neelankarai in SeptemberIndia · 16 kmHigh 32.4°C · Low 26.2°C · 102 mm rain
- Avadi in SeptemberIndia · 19 kmHigh 33.0°C · Low 25.6°C · 118 mm rain
- Pallāvaram in SeptemberIndia · 19 kmHigh 32.4°C · Low 26.0°C · 102 mm rain
- Tambaram in SeptemberIndia · 24 kmHigh 32.7°C · Low 25.9°C · 102 mm rain
- Maraimalainagar in SeptemberIndia · 42 kmHigh 32.7°C · Low 25.7°C · 121 mm rain
- Arakkonam in SeptemberIndia · 66 kmHigh 33.2°C · Low 25.1°C · 118 mm rain
- Kanchipuram in SeptemberIndia · 69 kmHigh 33.3°C · Low 25.3°C · 120 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 Chennai) is explained once on the Chennai year overview and on the Sources, method and limits page.
Pallāvaram, Tambaram and Neelankarai lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.