The best time to visit Namakkal is October - March as the weather is fairly pleasant. The rest of the year can be extremely hot and uncomfortable for travellers.
| Month | High/Low (°C) | Rain |
|---|---|---|
| January | 32°/ 19° | 2 days |
| February | 34°/ 20° | 0 days |
| March | 36°/ 22° | 3 days |
| April | 37°/ 24° | 12 days |
| May | 39°/ 26° | 15 days |
| June | 37°/ 25° | 13 days |
| July | 35°/ 24° | 13 days |
| August | 33°/ 24° | 18 days |
| September | 33°/ 23° | 20 days |
| October | 31°/ 22° | 29 days |
| November | 31°/ 22° | 17 days |
| December | 30°/ 20° | 4 days |