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Monthly climate in Tehran, Iran

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Tehran features a hot-summer Mediterranean climate (Csa). Temperatures typically range between -2 °C (29 °F) and 27 °C (81 °F) through the year, but rarely can drop to -23 °C (-9 °F) or can rise to as high as 36 °C (96 °F). The average annual precipitation amounts to about 393 mm (15.5 inches) and receives 65 rainy days on the 1 mm (0.04 inches) threshold annually. Tehran enjoys an average of 3870 hours of sunshine throughout the year, and daylight varies from 9 hours 46 minutes to 14 hours 31 minutes per day.

Monthly average temperatures in Tehran, Iran

The warmest months in Tehran are June, July and August, with daily mean temperatures ranging from 24 to 27 °C (76 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -2 to 1 °C (29 - 34 °F) throughout the day. On average each year, Tehran experiences 100 days above 25 °C (77.0 °F) and 96 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Tehran. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum12°C
(53°F)		11°C
(52°F)		21°C
(70°F)		25°C
(77°F)		30°C
(86°F)		33°C
(92°F)		36°C
(96°F)		35°C
(95°F)		33°C
(91°F)		26°C
(79°F)		20°C
(68°F)		13°C
(55°F)
Mean maximum7°C
(45°F)		9°C
(48°F)		15°C
(59°F)		21°C
(69°F)		28°C
(82°F)		32°C
(89°F)		35°C
(95°F)		34°C
(93°F)		31°C
(88°F)		25°C
(77°F)		17°C
(62°F)		10°C
(51°F)
Average high3°C
(37°F)		4°C
(39°F)		9°C
(49°F)		15°C
(60°F)		22°C
(71°F)		29°C
(85°F)		32°C
(89°F)		30°C
(86°F)		27°C
(80°F)		18°C
(65°F)		10°C
(50°F)		6°C
(42°F)
Daily mean-2°C
(29°F)		-0°C
(32°F)		5°C
(42°F)		11°C
(53°F)		17°C
(63°F)		24°C
(76°F)		27°C
(81°F)		26°C
(78°F)		22°C
(72°F)		14°C
(57°F)		6°C
(43°F)		1°C
(34°F)
Average low-7°C
(20°F)		-5°C
(24°F)		1°C
(35°F)		7°C
(45°F)		12°C
(54°F)		19°C
(66°F)		22°C
(72°F)		21°C
(69°F)		17°C
(63°F)		10°C
(49°F)		2°C
(36°F)		-4°C
(26°F)
Mean minimum-15°C
(6°F)		-14°C
(6°F)		-5°C
(23°F)		-3°C
(28°F)		6°C
(43°F)		13°C
(56°F)		18°C
(64°F)		17°C
(62°F)		12°C
(54°F)		3°C
(37°F)		-6°C
(21°F)		-11°C
(13°F)
Minimum-16°C
(3°F)		-23°C
(-9°F)		-8°C
(17°F)		-7°C
(19°F)		4°C
(40°F)		10°C
(51°F)		14°C
(58°F)		15°C
(59°F)		10°C
(50°F)		1°C
(34°F)		-8°C
(17°F)		-14°C
(6°F)

Compare climate in Tehran with other places

Compare temperature, precipitation, sunshine, UV index in Tehran, Iran with other places around the world.

Monthly average precipitation in Tehran, Iran

Tehran usually has the most precipitation in February, March and April, with an average of 10 rainy days and 64 mm (2.5 inches) of precipitation per month. The driest months in Tehran are June, August and September. On average, 3 mm (0.1 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Tehran. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)39 (1.5)66 (2.6)58 (2.3)70 (2.8)34 (1.3)4 (0.2)6 (0.2)1 (0.1)4 (0.2)31 (1.2)47 (1.9)35 (1.4)
Average precipitation days (≥ 1 mm)69101161100687

Monthly sunshine hours in Tehran, Iran

The sunniest months in Tehran are May, June and July, when the sun shines an average of 12 hours 42 minutes a day. Least sunny months in Tehran: January, November and December receive an average of 8 hours 8 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Tehran. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours224269318335381393394376341310256267
Mean daily daylight hours10h 1m10h 52m11h 58m13h 6m14h 2m14h 31m14h 16m13h 26m12h 22m11h 14m10h 16m9h 46m

Solar UV radiation in Tehran, Iran

Tehran experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 11 - 13, which corresponds to the Extreme category of sun exposure. January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Tehran UV Index data.

Average daily maximum UV levels by month for Tehran. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)46891312111010753