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Monthly climate in Rey, Tehran, Iran

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Rey features a hot-summer Mediterranean climate (Csa).Temperatures typically range between 4 °C (40 °F) and 33 °C (91 °F) through the year, but rarely can drop to -15 °C (6 °F) or can rise to as high as 42 °C (109 °F).The average annual precipitation amounts to about 313 mm (12.3 inches) and receives 52 rainy days on the 1 mm (0.04 inches) threshold annually.Rey enjoys an average of 3870 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 Rey, Tehran, Iran §

The warmest months in Rey are June, July and August, with daily mean temperatures ranging from 30 to 33 °C (86 - 91 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 6 °C (40 - 44 °F) throughout the day. On average each year, Rey experiences 151 days above 25 °C (77.0 °F) and 34 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Rey, Tehran, Iran.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 16°C
(61°F)		 19°C
(67°F)		 29°C
(85°F)		 32°C
(91°F)		 38°C
(100°F)		 40°C
(104°F)		 42°C
(109°F)		 41°C
(107°F)		 39°C
(102°F)		 32°C
(91°F)		 26°C
(80°F)		 19°C
(67°F)
Mean maximum 14°C
(58°F)		 17°C
(63°F)		 23°C
(73°F)		 29°C
(84°F)		 35°C
(96°F)		 38°C
(101°F)		 41°C
(107°F)		 40°C
(105°F)		 38°C
(100°F)		 31°C
(89°F)		 23°C
(73°F)		 17°C
(62°F)
Average high 10°C
(50°F)		 12°C
(53°F)		 17°C
(63°F)		 23°C
(73°F)		 29°C
(85°F)		 36°C
(97°F)		 39°C
(102°F)		 37°C
(98°F)		 33°C
(92°F)		 25°C
(77°F)		 15°C
(60°F)		 12°C
(53°F)
Daily mean 4°C
(40°F)		 6°C
(44°F)		 12°C
(53°F)		 17°C
(64°F)		 23°C
(74°F)		 30°C
(86°F)		 33°C
(91°F)		 31°C
(88°F)		 27°C
(80°F)		 19°C
(66°F)		 11°C
(52°F)		 6°C
(44°F)
Average low -1°C
(31°F)		 1°C
(34°F)		 6°C
(44°F)		 12°C
(53°F)		 17°C
(63°F)		 23°C
(73°F)		 26°C
(79°F)		 24°C
(76°F)		 20°C
(68°F)		 13°C
(55°F)		 6°C
(44°F)		 2°C
(36°F)
Mean minimum -6°C
(21°F)		 -6°C
(21°F)		 1°C
(34°F)		 5°C
(40°F)		 12°C
(54°F)		 18°C
(65°F)		 23°C
(73°F)		 21°C
(70°F)		 16°C
(62°F)		 8°C
(47°F)		 1°C
(35°F)		 -3°C
(28°F)
Minimum -12°C
(11°F)		 -15°C
(6°F)		 -1°C
(31°F)		 2°C
(37°F)		 10°C
(50°F)		 17°C
(62°F)		 21°C
(70°F)		 20°C
(67°F)		 16°C
(61°F)		 7°C
(45°F)		 0°C
(32°F)		 -5°C
(24°F)

Compare climate in Rey with other places

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

Monthly average precipitation in Rey, Tehran, Iran §

Rey usually has the most precipitation in February, April and November, with an average of 8 rainy days and 51 mm (2.0 inches) of precipitation per month.The driest months in Rey are July, August and September. On average, 1 mm (0.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Rey, Tehran, Iran.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 34 (1.3) 53 (2.1) 48 (1.9) 50 (2.0) 19 (0.7) 2 (0.1) 2 (0.1) 0 (0.0) 1 (0.0) 20 (0.8) 50 (2.0) 34 (1.3)
Average precipitation days (≥ 1 mm) 6 9 8 8 3 0 0 0 0 4 7 7

Monthly sunshine hours in Rey, Tehran, Iran §

The sunniest months in Rey are May, June and July, when the sun shines an average of 12 hours 42 minutes a day.Least sunny months in Rey: 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 Rey, Tehran, Iran.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 224 269 318 335 381 393 394 376 341 310 256 267
Mean daily daylight hours 10h 2m 10h 53m 11h 58m 13h 5m 14h 2m 14h 30m 14h 16m 13h 26m 12h 21m 11h 15m 10h 16m 9h 46m

Solar UV radiation in Rey, Tehran, Iran §

Rey 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 Rey UV Index data.

Average daily maximum UV levels by month for Rey, Tehran, Iran.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 4 6 8 9 13 12 11 10 10 7 5 3