UV Index
UV Index
Today's UV index in Karaj, Iran 
will be up to 11.1, indicating a extreme level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-08
UV index at 11.1 in Karaj means extreme risk: limit outdoor time especially from 10 a.m. to 4 p.m., actively seek shade, wear protective clothing, broad-brimmed hat, apply SPF 30+ sunscreen every 2 hours, and wear UV-blocking sunglasses. Watch for bright surfaces like water and snow increasing UV exposure.
Karaj's UV index varies seasonally, reaching moderate to high levels, especially during summer months when the sun is strongest. Spring and autumn have lower UV indexes, while winter sees the least UV exposure.
Karaj experiences hot, dry summers and cool, wet winters. Spring and autumn are mild with occasional rain. The weather changes through the year with warmer temperatures peaking in July and the coldest weather in January.
Compared to other parts of Iran, Karaj has a milder climate because of its location near the Alborz mountains. It is cooler and less arid than southern Iran but warmer and drier than northern coastal areas. Neighboring Tehran is slightly hotter and drier.
See the UV index hour by hour for Karaj, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.