See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
05:58
Sunrise
17:59
Sunset
Moon
Waxing Gibbous
14:39
Moonrise
00:13
Moonset
Daily Forecast
Today
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Air Quality Data Available
Upgrade to access real-time air quality data for Karaj.
Resources
UV Index
Humidity
Current stargazing conditions?
See sky darkness, moon phase, and the best viewing window for Karaj.
View stargazing scoreWeather in Karaj tomorrow, September 21, 2026
Sunshine leads the day in Karaj on September 21, 2026, with a patch of cloud building near 00:00. The broader outlook stays fair despite that temporary thickening. The opening hours look fair, as cloud stays near 16% around 00:00. Morning errands should face fewer weather interruptions.
The temperature range runs from about 18°C up to 33°C. The air stays humid, with relative humidity between 8% and 53% and the peak around 07:00. Airflow remains manageable, reaching about 3.3 km/h around 07:00.
Through the afternoon skies look more workable, with cloud near 0% around 12:00. Later outdoor plans have a clearer window than the morning may have suggested. Visibility stays near 16.1 km. Daylight runs from 05:58 to 17:57, lasting 11 hours 58 minutes of sunlight today.
Overall, Karaj on September 21, 2026 favours outdoor plans under mostly open skies, with a comfortable high near 33°C.
Frequently asked questions about weather in Karaj
How warm does it get in Karaj?
The warmest month in Karaj is July, with average high temperatures of 36°C. The average temperature during this period is around 29°C.
How cold does it get in Karaj?
The coldest month in Karaj is January, with average low temperatures of -3°C. The average temperature during this period is around 2°C.
What is the wettest time of year in Karaj?
The wettest month in Karaj is March, with an average of 49mm of precipitation.
What is the driest time of year in Karaj?
The driest month in Karaj is August, with an average of 0mm of precipitation.
