Chennai weather in September 2025

Expect daytime maximum temperatures of 34°C in Chennai, India in September and extreme heat and humidity based on long-term weather averages. There are 6 hours of sunshine per day on average with typically 135 mm of rainfall in the month.

  • 34°C maximum daytime temperature in September in Chennai34
    34°C max day temperature
  • 6 hours of sunshine per day
  • 6 days with some rainfall in September in Chennai6
    6 days with some rainfall
  • 25°C minimum night-time temperature in September in Chennai25
    25°C min night temperature
  • 12 hours of daylight per day in September in Chennai12
    12 hours of daylight per day
  • Extreme heat & humidity in September in ChennaiE
    Extreme heat & humidity
  • 135 mm monthly rainfall in September in Chennai135
    135 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in September in Chennai11
    11+ (Extreme) UV index
  • 29°C sea temperature in September in Chennai29
    29°C sea temperature

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The September weather guide for India (Chennai) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Chennai in September?

Daytime temperatures usually reach 34°C in Chennai in September with extreme heat and humidity, falling to 25°C at night.

How sunny is it in Chennai in September?

There are normally 6 hours of bright sunshine each day in Chennai in September - that's 52% of daylight hours.

How warm is the sea around Chennai in September?

The average sea temperature around Chennai in September is 29°C.

Does it rain in Chennai in September?

There are usually 6 days with some rain in Chennai in September and the average monthly rainfall is 135mm.

Chennai September sunrise & sunset times

Browse the sunrise and sunset times for Chennai in September 2025. Select a month to view Chennai sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:58 18:20
Monday, 15th September 2025 05:58 18:10
Tuesday, 30th September 2025 05:58 18:00

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