UV Index
UV Index
Today's UV index in Tucson, United States 
will be up to 11, 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: 2025-05-09
UV index at 11 in Tucson 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.
Tucson's UV index is very high, especially in summer months, often reaching levels above 10, which means strong UV radiation from the sun. The UV index peaks around midday. Tucson experiences hot summers with temperatures frequently above 100°F (38°C). Winters are mild and dry with cooler temperatures. The region has a monsoon season from June to September, bringing sudden heavy rains and thunderstorms. Tucson is located in the Sonoran Desert, so it is much drier than many other parts of the United States. Compared to nearby Phoenix, Tucson is slightly cooler and receives less rainfall. Its desert climate is hotter and sunnier than neighboring states like New Mexico and Arizona's higher elevation areas.
See the UV index hour by hour for Tucson, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.