Climate Overview
The climate in Tehran Imam Khomeini International Airport is warm and mild. The average annual temperature is 18°C and approximately 293mm of precipitation falls per year. March is the wettest month, receiving around 53mm of rainfall. Tehran Imam Khomeini International Airport is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, December, February, when temperatures can drop to -1°C. Light snow can occur between January and December.
Temperature
Tehran Imam Khomeini International Airport has a wide annual temperature range, spanning 40°C from the coldest to warmest months. July is the hottest month, with daytime highs reaching 39°C and an average of 33°C. The coldest month is January, when overnight lows fall to -1°C and the daily average is 5°C. On average, daily temperatures fluctuate by about 12°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 8°C shift in average temperatures.
Precipitation
Tehran Imam Khomeini International Airport is a quite dry location, receiving approximately 293mm of precipitation annually, which averages out to around 24mm per month. The wettest month is March, averaging 53mm of rainfall. February and January also tend to see above-average precipitation. The driest month is August, with just 0mm. That's 53mm less than March, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Light snowfall can occur between January and December, totalling around 10cm annually. February is the snowiest month with approximately 5cm.
Wind
Tehran Imam Khomeini International Airport is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is May, averaging 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, with average winds dropping to 9km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 7km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 10km/h in winter, 15km/h in spring, 15km/h in summer, 11km/h in autumn.
Seasons
89 days until Summer
It is currently spring in Tehran Imam Khomeini International Airport, which began on March 20, 2026. Tehran Imam Khomeini International Airport is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 39°C, while the coldest stretch bottoms out in January near -1°C. Summer is next, beginning on June 21, 2026 — 89 days from now.
Spring
Temperatures range from 6 to 30°C. Rainfall is relatively light, with around 106mm over the season and a monthly average of 35mm. Winds are moderate at around 15km/h. Light layers work well as temperatures warm through the season — a great time to be outdoors.
Summer
Temperatures range from 23 to 39°C. Precipitation is minimal, with only around 4mm for the entire season. Winds are generally light, averaging 15km/h. Stay hydrated, wear sun protection, and seek shade during the hottest hours of the day.
Autumn
Temperatures range from 6 to 33°C. Rainfall is relatively light, with around 60mm over the season and a monthly average of 20mm. Winds are generally light, averaging 11km/h. Layered clothing works best as temperatures gradually cool — enjoy the crisp air and changing scenery.
Winter
Temperatures range from -1 to 12°C. Rainfall is relatively light, with around 124mm over the season and a monthly average of 41mm. Expect around 8cm of snow accumulation during this period. Winds are generally light, averaging 10km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Tehran Imam Khomeini International Airport is during April, May and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 23mm per month. By contrast, July can be uncomfortably hot with highs reaching 39°C, while January is the coldest period with lows dropping to -1°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.
Monthly Climate Data
The table below shows monthly climate averages for Tehran Imam Khomeini International Airport based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
