Climate in Tehran

Average daytime and nighttime temperatures

All climate diagrams on this site result from the collected data from ten measuring weather stations in Tehran.
Weather stations at an altitude above 1350m have not been included.
All data correspond to the average monthly values of the last 20 years.

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Tehran is one of the coldest regions in Iran with an average daily high temperature of only 23 degrees. For several months of the year, it is warm to hot at temperatures continuously above 25 degrees, sometimes up to 35 degrees. Due to the warmer temperatures, the best time for traveling is from June to September. Less attractive are the cold months from November to March.
Overview: Climate in Iran
Daylengths and sun positions in Iran
Compare climate with other regions or countries
Sunshine hours per day
The number of hours of sunshine refers to the time when the sun is actually visible. That is, without any obstruction of visibility by clouds, fog or mountains. With 11 hours per day, June is the sunniest month in the region of Tehran. In December, the sun shines the least.
Rain days per month
A rain day is a day on which at least 0.1 mm precipitation (=0.1 liter) per square meter falls. This can be rain, snow, hail or even dew. So it does not have to rain the whole day. With 7 rain days, March offers the most rain days, while August has the fewest.
Precipitation amount in mm/day
The amount of precipitation is measured in millimeters per square meter. Thus, at two mm/day, two liters of water fall on one square meter within 24 hours. With only 0.5 mm, the least amount of rain falls in June. November, on the other hand, has the most rain.
Relative humidity in %
Warm air can absorb more moisture than cold air. The relative humidity indicates how much moisture can be physically contained in the air. At high humidity, a person feels uncomfortable and perceives this as oppressive. In general, a relative humidity of 40-60% feels pleasant. With only 24% humidity on average, it is quite dry in August. The highest value of 65% is experienced here in January.
Absolute humidity in g/m³
In warm months, there is also a higher absolute humidity almost everywhere. At a temperature of 25°C, air can absorb up to 23 grams of water per cubic meter. At 20°C, it is only 17.3 grams. A relative humidity of 40% at 25°C thus corresponds to an absolute humidity of 9.2 grams of water. From a proportion of approx. 13.5 grams, humans perceive the air as muggy.
The "Humidex" (humidity index) is an index of well-being in warmer areas, calculated from the air temperature, relative humidity and dew point. The index corresponds approximately to the temperature felt. At high temperatures, the body transports heat away by sweating. At high humidity, the ambient air can only absorb a small amount of sweat and thus one feels uncomfortable. An index of 20-29 is considered comfortable. Up to 39, people perceive the air as slightly uncomfortable, and above 40, as very uncomfortable. Values above 45 are dangerous in the long run and often lead to heat stroke.
Climate charts for other regions in Iran

Map of Tehran

Most important cities in the region »Tehran«

As the capital region, it is arguably the most important part of Iran. Alone 3 major cities with over one million inhabitants are located here. The region has a west-east extension of about 520 km and over 310 km from north to south.

It consists of the seven provinces Alborz, Golestan, Mazandaran, Qazvin, Qom, Semnan and Tehran.

CityPopulationGeo position
Tehran8,846,78235° 41' 40"N51° 25' 17"E
Karaj1,592,49235° 49' 58"N50° 59' 30"E
Qom1,201,15834° 38' 24"N50° 52' 35"E
Qazvin402,74836° 16' 8"N50° 0' 15"E
Gorgan350,67636° 50' 30"N54° 26' 37"E
Sari309,82036° 33' 48"N53° 3' 36"E
Shahriar309,60735° 39' 32"N51° 3' 28"E
Malard281,02735° 39' 57"N50° 58' 36"E
Babol250,21736° 33' 5"N52° 40' 44"E
Amol237,52836° 28' 11"N52° 21' 3"E
Qarchak231,07535° 25' 43"N51° 34' 32"E
Nazarabad213,38835° 57' 15"N50° 36' 22"E
Semnan185,12935° 34' 37"N53° 23' 31"E
Varamin179,60335° 19' 27"N51° 38' 45"E
Shahrud150,12936° 25' 5"N54° 58' 35"E
Gonbad-e Kavus131,41637° 15' 0"N55° 10' 2"E
Behshahr93,50036° 41' 32"N53° 33' 9"E
Shahre Jadide Andisheh80,00035° 40' 49"N51° 1' 9"E
Takestan71,49936° 4' 11"N49° 41' 45"E
Chalus69,63836° 39' 18"N51° 25' 13"E
Damghan67,69436° 10' 4"N54° 20' 35"E
Robat Karim62,75335° 29' 5"N51° 4' 58"E
Pishva53,85635° 18' 29"N51° 43' 36"E
Istgah-e Rah Ahan-e Garmsar49,49135° 14' 4"N52° 18' 34"E
Neka48,84736° 39' 3"N53° 17' 57"E
Babolsar48,05136° 42' 9"N52° 39' 27"E
Azadshahr47,59037° 5' 13"N55° 10' 26"E
Nowshahr40,00036° 38' 56"N51° 29' 46"E
Tonekabon37,50136° 48' 59"N50° 52' 26"E
Eqbaliyeh36,70935° 18' 8"N51° 32' 9"E

Data basis: German Weather Service, individual values averaged and supplemented by own elements. Data on cities and inhabitants:, United Nations Statistics Division and own research.
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