October to March are the best months to visit Harihareshwar when the hot weather is a bit at rest. The Diwali and Shiv Ratri celebrations during this period along with Ganesh Chaturthi in September can make a visit to Harihareshwar a more enchanting one. The summers are quite warm, followed by a humid monsoon and pleasantly cool winters.
| Month | High/Low (°C) | Rain |
|---|---|---|
| January | 29°/ 20° | 0 days |
| February | 31°/ 21° | 0 days |
| March | 31°/ 22° | 0 days |
| April | 33°/ 24° | 0 days |
| May | 32°/ 26° | 0 days |
| June | 30°/ 26° | 21 days |
| July | 28°/ 25° | 31 days |
| August | 28°/ 25° | 30 days |
| September | 28°/ 24° | 29 days |
| October | 31°/ 24° | 16 days |
| November | 32°/ 24° | 3 days |
| December | 31°/ 23° | 0 days |