Chennai weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Poor
Best time to visit: January – February
What is the weather like in Chennai in September?
In September, Chennai is hot: daytime highs average 33 °C, and even at night it stays warm at around 26 °C. The sea averages 28.9 °C – lovely and warm for swimming. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 17 days, totalling 105 mm. On about 28 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is not an ideal month for a holiday in Chennai.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 22 | 26 | 34 |
| Day | 33° | 33° | 31° |
| Night | 26° | 26° | 25° |
| Sea | 29° | 29° | 29° |
| Sun | 5 h | 5 h | 5 h |
| Rain days | 16 | 17 | 19 |
More details for September
- Daylight
- 12 h 13 min05:58 – 18:11
- UV index
- 13 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or moreAll months
- Wind
- 17 km/haverage daily peakAll months
- Cloud cover
- 79 %on averageAll months
- Hot days
- 28 days30 °C or moreAll months
- Time zone
- UTC+5:30Asia/Kolkata
How the score comes together
- Temperatureweight 50 %30 %
- Sunshineweight 20 %37 %
- Few rainy daysweight 30 %11 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Chennai in September: quick answers
Is Chennai hot in September?
Yes. In September, Chennai is hot: daytime highs average 33 °C and nights stay around 26 °C. On about 28 days the thermometer climbs to 30 °C or more.
Can you swim in Chennai in September?
Yes. In September the sea averages 28.9 °C – lovely and warm for swimming.
Does it rain much in Chennai in September?
It rains often – on about 17 days, adding up to 105 mm.
Chennai month by month
The whole year in ChennaiAll destinations: IndiaWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences