Tehran, Iran Climate & Monthly Averages
The climate of Tehran
Seasons are the whole story in Tehran. The gap between an average July and an average January is 28°C - big day-to-night temperature swings and modest rainfall - which in practice means 100°F (38°C) afternoons at one end of the calendar and 49°F (9°C) at the other.
Climate quick facts
- Hottest month: July - highs near 100°F (38°C)
- Coldest month: January - highs near 49°F (9°C)
- Decade extremes (2015-2024): 110°F (43°C) high · 9°F (-13°C) low
- Wettest month: March (9 rainy days) · Sunniest: June (12.9 h sun/day)
- Climate type: semi-arid
- Annual swing: 28°C between the average warmest and coolest month · day to night: 11°C
- Snow: about 7 days a year
- Months averaging 30°C or hotter: 4
- Average humidity: 37%
Temperatures through the year
July is the warm end of the year, averaging 100°F (38°C) by day and 79°F (26°C) overnight. January bottoms out at 49°F (9°C) in daylight, 31°F (0°C) after dark. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 110°F (43°C) and the lowest daily minimum 9°F (-13°C). Between the average July and the average January lie 28°C, a wider spread than 94% of the 3496 cities in our dataset.
Rain, sun and snow
Average highs hold at or above 30°C for 4 months of the year, June through September being the unbroken run. June is the brightest month at 12.9 hours of sun a day, against an annual average of 10.5 - sunnier than roughly 82% of the cities we track. March is the wettest month at 2.2 inches (57 mm) over 9 days; August is the driest. Relative humidity averages 37% across the year, drier than almost anywhere else we cover.
How Tehran compares
- Annual precipitation is 12.0 inches (305 mm) - drier than all but 8% of the 3496 cities we track.
- Rain or snow reaches the ground on 52 days a year - fewer wet days than all but 9% of the 3496 cities we track.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 49° | 31° | 7 | 1.6 in | 8.5 h/day | 10.0 h | 23% | 52% |
| February | 52° | 34° | 8 | 1.8 in | 8.8 h/day | 10.8 h | 27% | 54% |
| March | 62° | 42° | 9 | 2.2 in | 9.6 h/day | 11.9 h | 29% | 48% |
| April | 73° | 52° | 7 | 1.5 in | 10.8 h/day | 13.1 h | 22% | 40% |
| May | 85° | 62° | 4 | 0.7 in | 12.0 h/day | 14.0 h | 14% | 30% |
| June | 96° | 73° | 0 | 0.1 in | 12.9 h/day | 14.6 h | 2% | 19% |
| July | 100° | 79° | 0 | 0.1 in | 12.8 h/day | 14.3 h | 2% | 20% |
| August | 97° | 76° | 0 | 0.0 in | 12.7 h/day | 13.5 h | 0% | 20% |
| September | 90° | 69° | 1 | 0.1 in | 11.3 h/day | 12.3 h | 2% | 23% |
| October | 76° | 57° | 4 | 0.8 in | 10.2 h/day | 11.2 h | 11% | 36% |
| November | 60° | 43° | 6 | 1.6 in | 8.3 h/day | 10.2 h | 22% | 52% |
| December | 51° | 35° | 6 | 1.5 in | 7.9 h/day | 9.7 h | 18% | 54% |
Tehran month by month
Average high and low for each month, with the bar showing where it sits in Tehran's year (left is the coldest night, right is the warmest afternoon).
January
- Rain
- 7 days
- Sunshine
- 8.5 h
- Daylight
- 10.0 h
- Snow
- 3 days
February
- Rain
- 8 days
- Sunshine
- 8.8 h
- Daylight
- 10.8 h
- Snow
- 2 days
March
- Rain
- 9 days
- Sunshine
- 9.6 h
- Daylight
- 11.9 h
April
- Rain
- 7 days
- Sunshine
- 10.8 h
- Daylight
- 13.1 h
May
- Rain
- 4 days
- Sunshine
- 12.0 h
- Daylight
- 14.0 h
June
- Rain
- 0 days
- Sunshine
- 12.9 h
- Daylight
- 14.6 h
July
- Rain
- 0 days
- Sunshine
- 12.8 h
- Daylight
- 14.3 h
August
- Rain
- 0 days
- Sunshine
- 12.7 h
- Daylight
- 13.5 h
September
- Rain
- 1 day
- Sunshine
- 11.3 h
- Daylight
- 12.3 h
October
- Rain
- 4 days
- Sunshine
- 10.2 h
- Daylight
- 11.2 h
November
- Rain
- 6 days
- Sunshine
- 8.3 h
- Daylight
- 10.2 h
December
- Rain
- 6 days
- Sunshine
- 7.9 h
- Daylight
- 9.7 h
- Snow
- 1 day
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
Seasons in Tehran
Spring (March through May)
Spring in Tehran is pleasantly warm, with daytime highs averaging 73°F (23°C) and nights around 52°F (11°C); expect showers on roughly 20 days across the season. Daylight is generous - around 10.8 hours of sun a day.
Summer (June through August)
Summer in Tehran turns very hot, with daytime highs averaging 98°F (36°C) and nights around 76°F (24°C); precipitation is essentially absent. Daylight is generous - around 12.8 hours of sun a day.
Fall (September through November)
Through fall, Tehran is pleasantly warm: 75°F (24°C) by day, 56°F (13°C) after dark, and rain comes on about 11 days over the three months.
Winter (December through February)
Winter runs cold here - highs near 51°F (10°C), nights near 33°F (1°C), and expect showers on roughly 20 days across the season, plus about 6 snowy days.
Climate questions, answered
How cold does Tehran get in winter?
How often does it rain in Tehran?
How warm is Tehran on average?
Which months are driest in Tehran?
Is Tehran humid?
Best time to visit Tehran
March to April and October to November is the sweet spot for Tehran - temperatures sit either side of the peak heat rather than in it. Expect 68°F (20°C) in the afternoon and around 6 days of rain in a typical month of it. For the same question asked the other way round, see where else is warm in March.
Pack for Tehran with lightweight, breathable clothing and serious sun protection and a warm jacket and layers for the cooler season. Even in July, lows of 79°F (26°C) make an extra layer worth the space.
Tehran temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.