Mumbai is prone to high temperatures, high humidity and tropical rain, though the climate is tempered by the influence of the Arabian Sea. Rainfall averages a soggy 2200mm (85in) per year, with the heaviest falls coming in the monsoon season from June to September. Recent years have seen massive floods, cited by many as evidence of global warming. January is the coolest month, though 12°C (53°F) is about as low as it goes. March and October tend to swelter, with temperatures rising as high as 38°C (100°F).
| Month | Temp (°C) | Rainfall (mm) | Humidity (%) | Sunshine (hours) |
| Jan | 19 - 28 | 2.5 | 9 | |
| Feb | 19 - 28 | 2.5 | 10 | |
| Mar | 22 - 30 | 2.5 | 9 | |
| Apr | 24 - 32 | 0 | 10 | |
| May | 27 - 33 | 18 | 10 | |
| Jun | 26 - 32 | 485 | 5 | |
| Jul | 25 - 29 | 617 | 2 | |
| Aug | 24 - 29 | 340 | 3 | |
| Sep | 24 - 29 | 264 | 5 | |
| Oct | 24 - 32 | 64 | 8 | |
| Nov | 23 - 32 | 13 | 9 | |
| Dec | 21 - 31 | 2.5 | 9 |