Tamil Nadu weather in September
September is a fair month to visit Tamil Nadu: highs of 32°C (89°F) and about 145 mm (5.7 in) of rain on average. Nights average 25°C (77°F) and cloud cover 72% (NASA POWER, 2001–2025 averages). It is the 3rd wettest month of the year and the 6th coolest. Compared with August, it is cooler and about as wet; October brings highs of 30°C (86°F) and 264 mm (10.4 in) of rain.
Figures are long-term averages for Chennai, the largest city in Tamil Nadu. See below for other places.
Is September a good time to visit Tamil Nadu?
fair month Weather score 59/100.
September is a fair month in Tamil Nadu. The weather is usually best in Jan–Mar.
Does it rain a lot in Tamil Nadu in September?
Some rain is normal: about 145 mm (5.7 in) falls in an average September. It is the 3rd wettest month of the year.
How warm is Tamil Nadu in September?
Days average 32°C (89°F) and nights 25°C (77°F).
Tamil Nadu weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | 28°C (82°F) | 21°C (69°F) | 16 mm | 36% | best |
| February | 30°C (87°F) | 21°C (70°F) | 6 mm | 29% | best |
| March | 34°C (93°F) | 23°C (74°F) | 15 mm | 30% | best |
| April | 35°C (96°F) | 26°C (78°F) | 26 mm | 37% | fair |
| May | 36°C (97°F) | 27°C (81°F) | 55 mm | 54% | fair |
| June | 35°C (94°F) | 27°C (80°F) | 68 mm | 77% | fair |
| July | 34°C (93°F) | 26°C (78°F) | 108 mm | 83% | least pleasant |
| August | 33°C (91°F) | 25°C (77°F) | 132 mm | 81% | least pleasant |
| September | 32°C (89°F) | 25°C (77°F) | 145 mm | 72% | fair |
| October | 30°C (86°F) | 25°C (76°F) | 264 mm | 63% | least pleasant |
| November | 28°C (83°F) | 23°C (74°F) | 292 mm | 61% | least pleasant |
| December | 27°C (81°F) | 22°C (71°F) | 126 mm | 51% | fair |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months
Weather across Tamil Nadu in September
Weather can differ a lot within Tamil Nadu: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Chennai | 32°C (89°F) | 25°C (77°F) | 145 mm | fair |
| Coimbatore | 28°C (82°F) | 20°C (68°F) | 126 mm | least pleasant |
| Kallakurichi | 32°C (90°F) | 22°C (72°F) | 116 mm | least pleasant |
| Madurai | 33°C (92°F) | 23°C (73°F) | 115 mm | least pleasant |
| Tirunelveli | 29°C (84°F) | 22°C (72°F) | 137 mm | fair |
| Teni | 28°C (83°F) | 19°C (66°F) | 128 mm | fair |
| Tiruchirappalli | 33°C (92°F) | 23°C (74°F) | 104 mm | least pleasant |
| Tiruppur | 32°C (90°F) | 22°C (72°F) | 87 mm | least pleasant |
| Salem | 32°C (90°F) | 22°C (71°F) | 112 mm | least pleasant |
| Erode | 32°C (89°F) | 21°C (70°F) | 100 mm | least pleasant |
| Vellore | 32°C (89°F) | 23°C (73°F) | 144 mm | least pleasant |
| Ambattur | 32°C (89°F) | 25°C (77°F) | 145 mm | fair |