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Monthly climate in Semnan, Iran

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Semnan features a hot-summer Mediterranean climate (Csa). Temperatures typically range between 4 °C (39 °F) and 31 °C (88 °F) through the year, but rarely can drop to -7 °C (19 °F) or can rise to as high as 42 °C (108 °F). The average annual precipitation amounts to about 124 mm (4.9 inches) and receives 24 rainy days on the 1 mm (0.04 inches) threshold annually. Semnan enjoys an average of 3943 hours of sunshine throughout the year, and daylight varies from 9 hours 46 minutes to 14 hours 30 minutes per day.

Monthly average temperatures in Semnan, Iran

The warmest months in Semnan are June, July and August, with daily mean temperatures ranging from 29 to 31 °C (84 - 88 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 6 °C (39 - 44 °F) throughout the day. On average each year, Semnan experiences 142 days above 25 °C (77.0 °F) and 36 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Semnan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum15°C
(59°F)		19°C
(66°F)		29°C
(85°F)		30°C
(86°F)		36°C
(98°F)		40°C
(104°F)		42°C
(108°F)		41°C
(107°F)		37°C
(99°F)		30°C
(86°F)		25°C
(78°F)		17°C
(64°F)
Mean maximum13°C
(56°F)		17°C
(63°F)		23°C
(74°F)		27°C
(82°F)		34°C
(93°F)		37°C
(99°F)		40°C
(105°F)		39°C
(102°F)		35°C
(96°F)		29°C
(85°F)		21°C
(70°F)		15°C
(59°F)
Average high9°C
(48°F)		11°C
(52°F)		16°C
(62°F)		22°C
(72°F)		28°C
(82°F)		35°C
(94°F)		36°C
(98°F)		34°C
(94°F)		31°C
(88°F)		23°C
(73°F)		14°C
(58°F)		10°C
(51°F)
Daily mean4°C
(39°F)		6°C
(44°F)		12°C
(53°F)		17°C
(63°F)		22°C
(72°F)		29°C
(84°F)		31°C
(88°F)		29°C
(84°F)		25°C
(77°F)		17°C
(63°F)		10°C
(50°F)		6°C
(43°F)
Average low-0°C
(31°F)		2°C
(35°F)		6°C
(44°F)		12°C
(53°F)		17°C
(62°F)		22°C
(72°F)		25°C
(77°F)		22°C
(73°F)		19°C
(66°F)		12°C
(53°F)		6°C
(42°F)		2°C
(36°F)
Mean minimum-5°C
(23°F)		-5°C
(23°F)		1°C
(34°F)		4°C
(39°F)		11°C
(53°F)		17°C
(63°F)		21°C
(69°F)		19°C
(66°F)		14°C
(57°F)		6°C
(43°F)		0°C
(32°F)		-2°C
(28°F)
Minimum-7°C
(19°F)		-7°C
(19°F)		-1°C
(30°F)		1°C
(35°F)		10°C
(50°F)		15°C
(59°F)		19°C
(67°F)		16°C
(62°F)		12°C
(53°F)		4°C
(40°F)		-1°C
(30°F)		-4°C
(25°F)

Compare climate in Semnan with other places

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

Monthly average precipitation in Semnan, Iran

Semnan usually has the most precipitation in February, March and November, with an average of 3 rainy days and 21 mm (0.8 inches) of precipitation per month. The driest months in Semnan are June, July and August. On average, 1 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Semnan. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)11 (0.4)21 (0.8)21 (0.8)17 (0.7)12 (0.5)1 (0.0)0 (0.0)1 (0.0)2 (0.1)8 (0.3)19 (0.8)11 (0.4)
Average precipitation days (≥ 1 mm)332430000243

Monthly sunshine hours in Semnan, Iran

The sunniest months in Semnan are May, June and July, when the sun shines an average of 12 hours 49 minutes a day. Least sunny months in Semnan: January, February and November receive an average of 8 hours 32 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Semnan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours227273329343383396399381343322267274
Mean daily daylight hours10h 2m10h 53m11h 58m13h 5m14h 2m14h 30m14h 16m13h 26m12h 21m11h 15m10h 16m9h 46m

Solar UV radiation in Semnan, Iran

Semnan experiences the highest level of ultraviolet (UV) radiation in May, June and July, when the maximum UV index can reach values of 12 - 13, which corresponds to the Extreme category of sun exposure. January, February 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 Semnan UV Index data.

Average daily maximum UV levels by month for Semnan. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)459101312121110754