Chennai Weather in September
India · Tropical Savanna climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
September in Chennai sees average temperatures ranging from a low of 25.9°C (78.6°F) to a high of 32.6°C (90.7°F), with a mean of 28.7°C (83.7°F). Compared to the annual average of 28.0°C (82.4°F), this month is 0.7°C warmer than the yearly norm. Precipitation averages 144.4mm, making it approximately 15.0mm wetter than the monthly average of 129.0mm. The city receives an average of 9.0 hours of sunshine per day during September, with relative humidity averaging 77.2%. Wind speeds reach an average maximum of 16.9 km/h. For travelers, this month offers a temperature experience in Chennai, with wetter-than-average conditions compared to the rest of the year.
Chennai's climate is defined by its coastal location on the Bay of Bengal. The city receives most of its rainfall during the northeast monsoon from October to December. I found the best time for exploring the city's temples and beaches is January to March, when the weather is dry and temperatures are at their most comfortable. The summer months are intensely hot, with temperatures pushing 40°C.
September vs Adjacent Months
| Metric | August | September | October |
|---|---|---|---|
| Mean Temp | 29.0°C (84.2°F) | 28.7°C (83.7°F) | 27.7°C (81.9°F) |
| Rainfall | 141.9mm | 144.4mm | 215.2mm |
| Sunshine | 9.4 hrs | 9.0 hrs | 9.6 hrs |
| Humidity | 74.9% | 77.2% | 80.5% |
| Wind | 17.7 km/h | 16.9 km/h | 15.4 km/h |
| Rainy Days | 27.4 | 25.4 | 25.6 |
Seasonal Context
September falls in Autumn in the Northern Hemisphere. Autumn sees temperatures gradually cooling from summer highs. For travelers visiting Chennai in September, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Chennai in September?
The average temperature in Chennai during September ranges from 25.9°C (78.6°F) to 32.6°C (90.7°F), with a mean of 28.7°C (83.7°F).
How much does it rain in Chennai in September?
Chennai receives an average of 144.4mm of precipitation in September, spread across approximately 25.4 rainy days.
What should I pack for Chennai in September?
Based on September weather data, pack lightweight, breathable clothing, sunscreen, and a hat. Rain gear is essential — this month averages 144.4mm of precipitation.
Is September a good time to visit Chennai?
September is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Chennai
Cities with Similar September Climate (Tropical Savanna)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 13.08°, 80.27°. Timezone: Asia/Kolkata. Last updated: 2026-07-30.