Chennai Weather in September

The climate in Chennai during September can be summarized as very hot, humid and wet.

September is in the fall / autumn in Chennai and is typically the 6th warmest month of the year. Daytime maximum temperatures average around a steamy 34°C (94°F), whilst at night 25°C (77°F) is normal.

On average September is the 5th wettest month of the year in Chennai with around 135mm 5.3 inches of rain making it a wet time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 6.8 hours of sunshine per day.

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Chennai in September 2025.