Chennai weather in September
September in Chennai: sweltering, rainy, with very humid — a good time to visit.
#7 of 12 months in Chennai · #508 of 604 destinations to visit in September · comfort 61/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Chennai climate normals — September
| Daytime high | 32°C / 90°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 26°C / 79°F | |
| Feels like (high) | 37°C / 99°F | |
| Rainfall | 122 mm / 4.8 in | 🌧 rainy |
| Rainy days | 18 days | |
| Humidity | 75% | 💦 very humid |
| Dew point | 24°C / 75°F | |
| Sunshine | 8.6 h/day | |
| Daylight | 12.2 h | |
| Wind | 18 km/h / 11 mph | |
| Air quality (US AQI) | 66 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Chennai in September — FAQ
- Is September a good time to visit Chennai?
- September in Chennai: sweltering, rainy, with very humid — a good time to visit. It ranks #7 of 12 months for Chennai on SeasonMap's comfort score (61/100).
- What is the weather like in Chennai in September?
- In September, Chennai averages a daily high of 32°C and a low of 25.9°C, with about 121.7 mm of rain over roughly 18 rainy days.
- What is the air quality in Chennai in September?
- Chennai has a mean US Air Quality Index of about 66 in September.