Chennai boasts a year-around average temperature of 29.7°C, peaking at 33.7°C in May, its warmest month, and dipping to an average low of 26.2°C in January, the coolest. Rainfall averages at 100.9mm annually, with November seeing the heaviest showers and February being the driest month.
Month | Temperature (Celcius) | Rainfall (mm) |
| January | 26.2 | 24.6 |
| February | 27.3 | 0.0 |
| March | 29.5 | 15.0 |
| April | 31.8 | 24.9 |
| May | 33.7 | 52.1 |
| June | 33.0 | 53.1 |
| July | 31.7 | 84.1 |
| August | 30.9 | 124.0 |
| September | 30.5 | 118.1 |
| October | 29.0 | 267.0 |
| November | 27.0 | 309.1 |
| December | 26.3 | 138.9 |