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 |