Asia › Iran › Tehran
30-year normals (1991-2020)
Tehran has a semi-arid steppe climate, classified as BSk in the Köppen system. The warmest month is July with an average high of 36°C, while the coldest month is January with lows dropping to -5°C. The annual temperature range of 41°C is typical of continental climates with distinct seasons.
The driest month is September with only 1 rain days and 4mm of precipitation. For travellers, September through to the following month typically offers the best balance of warm temperatures and dry conditions. Average humidity ranges from 65% to 65% throughout the year.
Based on temperature and rainfall data, the best months to visit Tehran are May, October, April. These months offer the most comfortable temperatures with relatively low rainfall, ideal for sightseeing and outdoor activities.
Full Best Time to Visit GuideWarmest Month
36°C
July
Coldest Month
-5°C
January
Driest Month
1 days
September
Annual Range
41°C
-5° to 36°
| Month | High | Low | Rain Days | Sun | Details |
|---|---|---|---|---|---|
| January | 6°C | -5°C | 8 | 9h | View |
| February | 8°C | -3°C | 9 | 9h | View |
| March | 14°C | 2°C | 9 | 10h | View |
| April | 20°C | 8°C | 9 | 11h | View |
| May | 27°C | 14°C | 5 | 12h | View |
| June | 33°C | 20°C | 2 | 13h | View |
| July | 36°C | 24°C | 1 | 13h | View |
| August | 35°C | 23°C | 1 | 13h | View |
| September | 30°C | 19°C | 1 | 11h | View |
| October | 23°C | 12°C | 4 | 10h | View |
| November | 14°C | 4°C | 7 | 9h | View |
| December | 8°C | -2°C | 8 | 8h | View |
January
8 rain days, 9h sun
February
9 rain days, 9h sun
March
9 rain days, 10h sun
April
9 rain days, 11h sun
May
5 rain days, 12h sun
June
2 rain days, 13h sun
July
1 rain days, 13h sun
August
1 rain days, 13h sun
September
1 rain days, 11h sun
October
4 rain days, 10h sun
November
7 rain days, 9h sun
December
8 rain days, 8h sun
Tehran in July
Data Sources for Tehran
Climate normals represent 30-year averages (1991-2020). Individual years may vary.