The best time to visit Sirumalai is October - March, offering a wispy winter experience. While the weather is great here throughout the year, summers here are not as scenic as October - March. It still makes for a great summer get away but can be avoided during the monsoons.
| Month | High/Low (°C) | Rain |
|---|---|---|
| January | 26°/ 15° | 4 days |
| February | 28°/ 15° | 1 days |
| March | 31°/ 17° | 4 days |
| April | 31°/ 19° | 14 days |
| May | 32°/ 20° | 26 days |
| June | 31°/ 20° | 14 days |
| July | 29°/ 19° | 13 days |
| August | 28°/ 18° | 15 days |
| September | 28°/ 18° | 20 days |
| October | 25°/ 17° | 28 days |
| November | 25°/ 17° | 20 days |
| December | 23°/ 16° | 9 days |