October to February are the best months to visit Narnaul. Rest of the months are very hot and should be avoided.
| Month | High/Low (°C) | Rain |
|---|---|---|
| January | 21°/ 7° | 3 days |
| February | 26°/ 9° | 1 days |
| March | 29°/ 14° | 6 days |
| April | 35°/ 21° | 4 days |
| May | 40°/ 25° | 2 days |
| June | 42°/ 29° | 2 days |
| July | 36°/ 27° | 16 days |
| August | 33°/ 25° | 20 days |
| September | 34°/ 25° | 9 days |
| October | 34°/ 21° | 1 days |
| November | 29°/ 17° | 2 days |
| December | 21°/ 8° | 1 days |