Climate Insights for Tehran

The climate in Tehran is temperate. The average annual temperature is 13°C and approximately 336mm of precipitation falls per year. March is the wettest month, receiving around 61mm of rainfall. Tehran 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, February, December, when temperatures can drop to -7°C. Snowfall occurs from January to December, with around 71cm accumulating over the season.

Tehran has a wide annual temperature range, spanning 39°C from the coldest to warmest months. The warmest month is July, when average highs reach 32°C and the mean temperature sits around 27°C. The coldest month is January, when overnight lows fall to -7°C and the daily average is -2°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 8°C shift in average temperatures.

Tehran is a quite dry location, receiving approximately 336mm of precipitation annually, which averages out to around 28mm per month. The wettest month is March, averaging 61mm of rainfall. February and April also tend to see above-average precipitation. The driest month is August, with just 1mm. That's 60mm 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. Snowfall is a regular feature from January to December, with around 71cm accumulating over the season. January typically sees the most snow at around 20cm.

Tehran is relatively calm, with an average annual wind speed of 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is June, averaging 13km/h, though still comfortable for most outdoor activities. The calmest conditions occur in November, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months. Wind tends to pick up during the summer months. The seasonal averages are 9km/h in winter, 11km/h in spring, 12km/h in summer, 10km/h in autumn.

It is currently spring in Tehran, which began on March 20, 2026. Tehran 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 32°C, while the coldest stretch bottoms out in January near -7°C. Summer is next, beginning on June 21, 2026 — 90 days from now.

The best time to visit Tehran is during May, June and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 10mm per month. By contrast, July can be uncomfortably hot with highs reaching 32°C, while January is the coldest period with lows dropping to -7°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Tehran 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.