Climate - Tehran (Iran)

Tehran's climate is arid continental, with quite cold, relatively rainy winters and very hot, sunny summers.
The city is the capital of Iran and is located in the north of the country, at 35 degrees north latitude. We are in the northern part of the Iranian plateau and at the foot of the Alborz Mountains, beyond which lies the Caspian Sea. Instead, south of the city lies the desert.



The northern suburbs, located at an altitude of up to 1,700 meters (5,600 feet) above sea level, are colder than the central and southern areas, which are located around 1,000/1,200 meters (3,300/4,000 feet). So, the average daily temperature in January ranges from 2.5 °C (36.5 °F) in the northern area to 5 °C (41 °F) in the southern one, while in July, it ranges from 29 °C to 31 °C (84 °C to 88 °F).
Winter, from December to February, is quite cold, although there are quite mild periods, especially in February, when the maximums exceed 12 °C (53.5 °F). Sometimes there can be cold spells, in which the temperature drops below freezing, and it can also snow. At Mehrabad Airport, located at 1,200 meters (3,900 feet) on the western outskirts of the city and more representative of its climate, the coldest record is -13 °C (8.6 °F), set in January 1973. However, at Imam Khomeini airport, located 30 km (18 mi) southwest of the city and 1,000 meters (3,300 feet) above sea level, the temperature dropped to -20 °C (-4 °F) in January 2008.
Summer in Tehran is hot, with scorching days, usually around 35/37 °C (95/99 °F) in July and August, but the humidity is low and the wind blows frequently. Sometimes there can be heat waves, during which the temperature reaches or exceeds 40 °C (104 °F). The highest record is 43 °C (109.4 °F), set in July 1975.
Here are the average temperatures at Mehrabad airport.

In Tehran, only 230 mm (9 in) of rain fall per year, most of which occurring from November to April: the desert is not far from here. However, in the northern districts, close to the mountains, rainfall exceeds 400 mm (15.5 in) per year. Here is the average precipitation.

In Tehran, the sun shines regularly in summer, while in winter, there is an alternation between cloudy and sunny days. On average, there are 2,800 hours of sunshine per year.

Best Time

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The best times to visit Tehran are spring and autumn, to avoid the winter cold and the summer heat, in particular, you can choose the first half of April and the second half of October.

Tehran - Weather by month

Based on the period 1991-2020

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In January, the coldest month of the year, the weather in Tehran is usually quite cold. The average temperature is of 4.9 °C (41 °F), with a minimum of 1 °C (33.9 °F) and a maximum of 8.7 °C (47.7 °F).
On the coldest nights of the month, the temperature usually drops to around -5.5 °C (22.5 °F). However, it dropped to -10.8 °C (12.6 °F) in January 2008.
On the warmest days of the month, the temperature usually reaches around 15.5 °C (59.5 °F). However, it reached 21.4 °C (70.5 °F) in January 2015.
Precipitation amounts to 35 mm (1.4 in), distributed over 6 days.
The day lasts on average 10 hours and 5 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 44% of the time.
The average humidity is 57%.
The average wind speed is 8 kph (5 mph).

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In February, the weather in Tehran is usually quite mild. The average temperature is of 7.0 °C (45 °F), with a minimum of 2.7 °C (36.9 °F) and a maximum of 11.4 °C (52.4 °F).
On the coldest nights of the month, the temperature usually drops to around -3.5 °C (25.5 °F). However, it dropped to -7.6 °C (18.3 °F) in February 2014.
On the warmest days of the month, the temperature usually reaches around 18 °C (64.5 °F). However, it reached 24.4 °C (75.9 °F) in February 2016.
Precipitation amounts to 35 mm (1.4 in), distributed over 5 days.
The day lasts on average 10 hours and 55 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 49% of the time.
The average humidity is 50%.
The average wind speed is 10 kph (6 mph).

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In March, the weather in Tehran is usually mild. The average temperature is of 11.7 °C (53 °F), with a minimum of 6.9 °C (44.3 °F) and a maximum of 16.5 °C (61.7 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around -0.5 °C (31 °F). However, it dropped to -6 °C (21.2 °F) in March 1992.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 23.5 °C (74 °F). However, it reached 30.3 °C (86.5 °F) in March 2018.
Precipitation amounts to 35 mm (1.4 in), distributed over 6 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 6 hours of sunshine per day. So, the sun shines 50% of the time.
The average humidity is 41%.
The average wind speed is 12 kph (8 mph).

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In April, the weather in Tehran is usually very mild. The average temperature is of 17.3 °C (63 °F), with a minimum of 12.2 °C (54 °F) and a maximum of 22.4 °C (72.2 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 4.5 °C (40 °F). However, it dropped to -2.6 °C (27.3 °F) in April 2014.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 29 °C (84 °F). However, it reached 33.4 °C (92.1 °F) in April 2008.
Precipitation amounts to 30 mm (1.2 in), distributed over 5 days.
The day lasts on average 13 hours and 5 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 56% of the time.
The average humidity is 37%.
The average wind speed is 12 kph (8 mph).

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In May, the weather in Tehran is usually warm to hot. The average temperature is of 22.8 °C (73 °F), with a minimum of 17.4 °C (63.3 °F) and a maximum of 28.3 °C (82.9 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 11 °C (51.5 °F). However, it dropped to 2.4 °C (36.3 °F) in May 1992.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 34 °C (93 °F). However, it reached 37 °C (98.6 °F) in May 2020.
Precipitation amounts to 15 mm (0.6 in), distributed over 4 days.
The day lasts on average 14 hours and 5 minutes. So the days are long.
There are on average 9 hours of sunshine per day. So, the sun shines 64% of the time.
The average humidity is 30%. Hence, the air is normally dry.
The average wind speed is 13 kph (8 mph).

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In June, the weather in Tehran is usually very hot. The average temperature is of 28.2 °C (83 °F), with a minimum of 22.2 °C (71.9 °F) and a maximum of 34.3 °C (93.8 °F).
On the coldest nights, which normally occur at the beginning of the month, the temperature usually drops to around 15.5 °C (60 °F). However, it dropped to 11 °C (51.8 °F) in June 2000.
On the warmest days, which normally occur at the end of the month, the temperature usually reaches around 38.5 °C (101.5 °F). However, it reached 42.2 °C (108 °F) in June 2015.
Precipitation amounts to only 3 mm (0.1 in), and all occurs in one day.
The day lasts on average 14 hours and 30 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 11 hours of sunshine per day. So, the sun shines 76% of the time.
The average humidity is 23%. Hence, the air is normally dry.
The average wind speed is 12 kph (7 mph).

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In July, the hottest month of the year, the weather in Tehran is usually very hot. The average temperature is of 31.0 °C (88 °F), with a minimum of 25 °C (77 °F) and a maximum of 36.9 °C (98.5 °F).
On the coldest nights of the month, the temperature usually drops to around 19.5 °C (67.5 °F). However, it dropped to 16.6 °C (61.9 °F) in July 2017.
On the warmest days of the month, the temperature usually reaches around 41 °C (105.5 °F). However, it reached 42.6 °C (108.7 °F) in July 2008.
Precipitation amounts to only 3 mm (0.1 in), and all occurs in one day.
The day lasts on average 14 hours and 20 minutes. So the days are long.
There are on average 11 hours of sunshine per day. So, the sun shines 76% of the time.
The average humidity is 24%. Hence, the air is normally dry.
The average wind speed is 11 kph (7 mph).

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In August, the weather in Tehran is usually very hot. The average temperature is of 30.2 °C (86 °F), with a minimum of 24.5 °C (76.1 °F) and a maximum of 35.8 °C (96.5 °F).
On the coldest nights of the month, the temperature usually drops to around 19.5 °C (67.5 °F). However, it dropped to 14 °C (57.2 °F) in August 2011.
On the warmest days of the month, the temperature usually reaches around 39.5 °C (103.5 °F). However, it reached 42 °C (107.6 °F) in August 2005.
Precipitation amounts to only 1 mm (0 in), distributed over 0 days.
The day lasts on average 13 hours and 25 minutes.
There are on average 11 hours of sunshine per day. So, the sun shines 81% of the time.
The average humidity is 25%. Hence, the air is normally dry.
The average wind speed is 9 kph (6 mph).

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In September, the weather in Tehran is usually warm to hot. The average temperature is of 26.1 °C (79 °F), with a minimum of 20.5 °C (69 °F) and a maximum of 31.6 °C (89 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 14.5 °C (58.5 °F). However, it dropped to 10.8 °C (51.4 °F) in September 2009.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 36 °C (97 °F). However, it reached 38 °C (100.4 °F) in September 2016.
Precipitation amounts to only 1 mm (0 in), distributed over 0 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 10 hours of sunshine per day. So, the sun shines 81% of the time.
The average humidity is 27%. Hence, the air is normally dry.
The average wind speed is 9 kph (6 mph).

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In October, the weather in Tehran is usually warm. The average temperature is of 19.7 °C (67 °F), with a minimum of 14.6 °C (58.3 °F) and a maximum of 24.8 °C (76.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 9 °C (48 °F). However, it dropped to 5 °C (41 °F) in October 2011.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 30.5 °C (87 °F). However, it reached 33.4 °C (92.1 °F) in October 2002.
Precipitation amounts to 15 mm (0.6 in), distributed over 3 days.
The day lasts on average 11 hours and 10 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 71% of the time.
The average humidity is 36%.
The average wind speed is 8 kph (5 mph).

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In November, the weather in Tehran is usually mild. The average temperature is of 11.7 °C (53 °F), with a minimum of 7.5 °C (45.5 °F) and a maximum of 15.9 °C (60.6 °F).
On the coldest nights, which normally occur at the end of the month, the temperature usually drops to around 1.5 °C (34.5 °F). However, it dropped to -7.2 °C (19 °F) in November 2016.
On the warmest days, which normally occur at the beginning of the month, the temperature usually reaches around 22.5 °C (72.5 °F). However, it reached 26.6 °C (79.9 °F) in November 2012.
Precipitation amounts to 20 mm (0.8 in), distributed over 3 days.
The day lasts on average 10 hours and 20 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 55% of the time.
The average humidity is 49%.
The average wind speed is 7 kph (5 mph).

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In December, the weather in Tehran is usually quite mild. The average temperature is of 6.7 °C (44 °F), with a minimum of 3 °C (37.4 °F) and a maximum of 10.4 °C (50.8 °F).
On the coldest nights of the month, the temperature usually drops to around -2.5 °C (28 °F). However, it dropped to -8.6 °C (16.5 °F) in December 1994.
On the warmest days of the month, the temperature usually reaches around 16.5 °C (61.5 °F). However, it reached 21.2 °C (70.2 °F) in December 1991.
Precipitation amounts to 35 mm (1.4 in), distributed over 6 days.
The day lasts on average 9 hours and 50 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 4.5 hours of sunshine per day. So, the sun shines 44% of the time.
The average humidity is 58%.
The average wind speed is 7 kph (4 mph).