The temperatures in Tamil Nadu during September are extremely high, between 27°C and hot as 33°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Tamil Nadu. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Tamil Nadu in September 2025.
If you’re planning to visit Tamil Nadu in the near future, we highly recommend that you review the 14 day weather forecast for Tamil Nadu before you arrive.