Climate Insights for Karaj

The climate in Karaj is temperate. The average annual temperature is 14°C and approximately 316mm of precipitation falls per year. March is the wettest month, receiving around 58mm of rainfall. Karaj 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 -5°C. Light snow can occur between January and December.

Karaj has a wide annual temperature range, spanning 39°C from the coldest to warmest months. The warmest month is July, when average highs reach 34°C and the mean temperature sits around 29°C. The coldest month is January, when overnight lows fall to -5°C and the daily average is 0°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 8°C shift in average temperatures.

Karaj is a quite dry location, receiving approximately 316mm of precipitation annually, which averages out to around 26mm per month. The wettest month is March, averaging 58mm of rainfall. February and January also tend to see above-average precipitation. The driest month is August, with just 1mm. That's 58mm 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 43cm annually. January is the snowiest month with approximately 15cm.

Karaj is relatively calm, with an average annual wind speed of 11km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is July, averaging 13km/h, though still comfortable for most outdoor activities. The calmest conditions occur in December, 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, 13km/h in summer, 10km/h in autumn.

It is currently spring in Karaj, which began on March 20, 2026. Karaj 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 34°C, while the coldest stretch bottoms out in January near -5°C. Summer is next, beginning on June 21, 2026 — 90 days from now.

The best time to visit Karaj is during May, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 14mm per month. By contrast, July can be uncomfortably hot with highs reaching 34°C, while January is the coldest period with lows dropping to -5°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Karaj 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.