UV Index
UV Index
Today's UV index in Semnan, Iran 
will be up to 11.9, 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: 2025-07-22
UV index at 11.9 in Semnan 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.
The UV index in Semnan, Iran, can be very high, especially during the summer months, often reaching levels that indicate strong sun exposure. UV levels are generally lower in the winter but still noticeable.
Semnan experiences hot, dry summers with temperatures frequently rising above 35°C (95°F). Winters are cool and mild, with temperatures dropping to around 0°C (32°F) at night. Rainfall is scarce and mainly occurs in the winter and early spring.
Compared to other areas in Iran, Semnan has a more arid climate due to its location near the desert. It is drier and hotter than northern Iran but cooler and less humid than southern coastal regions. Neighboring countries with desert climates, like parts of Afghanistan, have similar weather patterns.
See the UV index hour by hour for Semnan, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.