Tehran climate
Tehran (Iran) has a cold semi-arid climate (Köppen BSk). The average temperature over the year is 17 °C62 °F, and about 311 mm12 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Tehran climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 847 | −229 | 338 | 341.3 | 19 |
| Feb | 1152 | 032 | 542 | 341.4 | 12 |
| Mar | 1763 | 440 | 1151 | 351.4 | 3 |
| Apr | 2272 | 948 | 1660 | 381.5 | 0 |
| May | 2985 | 1559 | 2272 | 150.6 | 0 |
| Jun | 3596 | 2069 | 2882 | 60.2 | 0 |
| Jul | 38100 | 2374 | 3187 | 70.3 | 0 |
| Aug | 3697 | 2272 | 2985 | 80.3 | 0 |
| Sep | 3189 | 1865 | 2577 | 160.6 | 0 |
| Oct | 2476 | 1254 | 1865 | 361.4 | 0 |
| Nov | 1559 | 440 | 1049 | 451.8 | 3 |
| Dec | 1050 | 032 | 541 | 351.4 | 13 |
| Year | 38100 | −229 | 1762 | 31112 | 50 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 58% | 53% | 2.7 | 9:59 |
| Feb | 55% | 54% | 3.5 | 10:50 |
| Mar | 50% | 57% | 4.7 | 11:52 |
| Apr | 48% | 58% | 5.7 | 13:03 |
| May | 38% | 48% | 7.0 | 14:02 |
| Jun | 25% | 33% | 8.0 | 14:34 |
| Jul | 23% | 35% | 7.6 | 14:21 |
| Aug | 23% | 27% | 7.1 | 13:30 |
| Sep | 28% | 25% | 6.0 | 12:21 |
| Oct | 40% | 37% | 4.4 | 11:13 |
| Nov | 54% | 51% | 3.0 | 10:13 |
| Dec | 59% | 51% | 2.5 | 9:45 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Tehran is like
The warmest month is July, with an average high of 38 °C100 °F and a low of 23 °C74 °F. The coldest is January, when highs average 8 °C47 °F and lows −2 °C29 °F. Seasons are strongly marked: the warmest month is on average 27.2 °C48.9 °F warmer than the coldest.
It is dry, with about 311 mm12 in of precipitation per year. The wettest three-month stretch is October–December, which brings 38% of the annual total. Months with less than 20 mm0.8 in on average: May–September. The wettest month is November (45 mm1.8 in), the driest is June (6 mm0.2 in).
Relative humidity ranges from 23% in July to 59% in December. The clearest skies (lowest average cloud amount, 25%) are typical of September. Average wind speed near the ground ranges from 6 km/h (4 mph) in December to 10 km/h (6 mph) in July. Daylight lasts from about 9.8 hours in December to 14.6 hours in June.
A lasting snow cover is typical in December–February, when the average snow depth in the reanalysis exceeds 10 cm (deepest in January, about 13 cm).
Best time to visit Tehran
Based on these averages, the most comfortable months for sightseeing and outdoor activities are April and May and October: average highs of 22 °C72 °F to 29 °C85 °F with 15 mm0.6 in to 38 mm1.5 in of precipitation per month.
The most challenging month is January, which is cold, with average highs of 8 °C47 °F.
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
Tehran weather by month
- January8 °C47 °F / −2 °C29 °F
- February11 °C52 °F / 0 °C32 °F
- March17 °C63 °F / 4 °C40 °F
- April22 °C72 °F / 9 °C48 °F
- May29 °C85 °F / 15 °C59 °F
- June35 °C96 °F / 20 °C69 °F
- July38 °C100 °F / 23 °C74 °F
- August36 °C97 °F / 22 °C72 °F
- September31 °C89 °F / 18 °C65 °F
- October24 °C76 °F / 12 °C54 °F
- November15 °C59 °F / 4 °C40 °F
- December10 °C50 °F / 0 °C32 °F
What to pack for Tehran
- Winter (December–February) — highs 847 to 11 °C52 °F, lows −229 to 0 °C32 °F, about 34 mm1.4 in of precipitation a month. Pack a warm coat, layers and closed shoes, an extra layer for the cooler mornings and evenings and shoes with good grip, as frost is common.
- Spring (March–May) — highs 1763 to 29 °C85 °F, lows 440 to 15 °C59 °F, about 30 mm1.2 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
- Summer (June–August) — highs 3596 to 38 °C100 °F, lows 2069 to 23 °C74 °F, about 7 mm0.3 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water.
- Autumn (September–November) — highs 1559 to 31 °C89 °F, lows 440 to 18 °C65 °F, about 32 mm1.3 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
How Tehran compares
Of the 82 places in Iran covered by World Climates, Tehran is the 40th warmest by annual mean temperature and the 26th wettest by annual precipitation. See all of them on the Iran climate page.
Places in other countries with the most similar temperature and rainfall pattern: Chust (Uzbekistan, BWk), Manas (Kyrgyzstan, BSk) and Andijon (Uzbekistan, BWk).
The same NASA POWER grid cell also contains Eslamshahr (pop. 450,000), Shahriar (pop. 309,607), Qods (pop. 309,605), Golestan (pop. 240,000), Nasimshahr (pop. 200,393), Shahre Jadide Andisheh (pop. 116,062) and Robat Karim (pop. 105,393). Their long-term averages in this dataset are essentially the same as for Tehran, so they do not have separate pages.
Nearby places
- Qarchak 33 km · 18 °C65 °F · 334 mm13 in
- Karaj 42 km · 14 °C58 °F · 509 mm20 in
- Nazarabad 79 km · 16 °C60 °F · 426 mm17 in
- Chalus 107 km · 21 °C70 °F · 799 mm31 in
- Amol 120 km · 19 °C67 °F · 647 mm25 in
- Saveh 122 km · 18 °C65 °F · 248 mm9.8 in
- Qom 127 km · 19 °C66 °F · 207 mm8.1 in
- Qazvin 143 km · 13 °C55 °F · 614 mm24 in
Frequently asked questions
What is the warmest month in Tehran?
July is the warmest month in Tehran, with an average high of 38 °C (100 °F) and an average low of 23 °C (74 °F).
What is the coldest month in Tehran?
January is the coldest month, with an average high of 8 °C (47 °F) and an average low of -2 °C (29 °F).
When does it rain the most in Tehran?
November is the wettest month with about 45 mm (1.8 in) of precipitation; June is the driest with about 6 mm (0.2 in).
What is the best time to visit Tehran?
Judging by long-term averages, the most comfortable months are April and May and October.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.