What September feels like in Chennai
September falls in Chennai's wet season — the rainfall numbers rise clearly above the dry months. Expect proper heat in the afternoon — slow down between noon and four. Evenings ease the heat only slightly, and nights remain very warm. The air is muggy, so it feels hotter than the thermometer suggests.
Rain in Chennai in September
Dry days are the exception, with rain on most days. Each rainy day adds about 6.7 mm (0.3 in), a proper wetting rather than a sprinkle. That is lighter than the city's yearly norm of about 9.2 mm per rainy day.
Daylight and sunshine in September
On 15 September the sun rises at about 5:58 am and sets around 6:11 pm local time, giving 12 h 13 min of daylight. Days are getting shorter: 21 min less daylight than in mid-August. Close to the equator, sunrise and sunset times move very little through the year. The sun is out for roughly 74% of those daylight hours, so there are plenty of bright spells.
How September compares to the rest of the year
In Chennai's temperature order, September sits as the 6th warmest month. Afternoons run 0.6°C (1.1°F) cooler than in August, with 10 mm less rain. Temperatures keep falling into October. October averages a high of 30.9°C (87.6°F).
Who September suits
- Sightseeing: less ideal — rain falls on more than half the days.
- Parks & outdoor: less ideal — afternoons are too warm to linger outside.
- Beach: a good fit — hot coastal weather.
- Museums & indoor: a good choice — with rain on most days, galleries and museums make easy plans.
Tips for visiting Chennai in September
Rain Protection
A compact umbrella and a light waterproof jacket.
Sun Protection
Sunscreen, a hat and sunglasses; light breathable clothes.
Quick questions
How warm is Chennai in September?
It feels hot: typical highs are 32.5°C (90.5°F), with lows near 26°C (78.8°F).
Does it rain a lot in Chennai in September?
Yes, fairly — rain falls most days and totals about 127 mm, so an umbrella is worth carrying.
What should I wear in Chennai in September?
Pack rain protection and sun protection. Evenings feel similar to the day, so the same clothes work from morning to night.
Is September or October better for visiting Chennai?
October, clearly: it ranks #9 of 12 among Chennai's months, against #12 for the other. October is cooler.