Tehran is warmest in July, averaging 38° by day and 24° at night. The wettest month is February with 48 mm, and the year brings about 335 mm in total.
Month by month
| Month | High | Low | Rain | Daylight | Good for |
|---|---|---|---|---|---|
| January | 10° | -1° | 34 mm | 9.8 h | Cool |
| February | 12° | 0° | 48 mm | 10.7 h | Mild |
| March | 18° | 4° | 37 mm | 11.7 h | Sightseeing |
| April | 24° | 9° | 27 mm | 12.9 h | Sightseeing |
| May | 29° | 15° | 25 mm | 13.9 h | Beach weather |
| June | 37° | 21° | 6 mm | 14.4 h | Very hot |
| July | 38° | 24° | 12 mm | 14.2 h | Very hot |
| August | 37° | 23° | 9 mm | 13.4 h | Very hot |
| September | 33° | 19° | 18 mm | 12.2 h | Beach weather |
| October | 25° | 12° | 31 mm | 11.1 h | Sightseeing |
| November | 17° | 5° | 51 mm | 10.1 h | Sightseeing |
| December | 11° | 1° | 37 mm | 9.6 h | Cool |
High and low are average daily maximum and minimum, rain is typical monthly total, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER — averages, not promises.
When to go
Beach weather: May and September — highs around 31°, nights no colder than 15°, and at most 25 mm of rain in a month.
Walking the city: March, April, October and November — highs of 17–25° and no more than 51 mm of rain a month.
Serious heat: In June, July and August the average high reaches 38°.