UV Index
UV Index
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Today's UV index in Tucson, United States 
will be up to 11.2, indicating a extreme level of sun exposure for the average person. Check the annual sun radiation in the city and our tips for today to make sure you're safe in the sun.
UV index at 11.2 in Tucson means extreme risk; limit outdoor time from 10 a.m. to 4 p.m., use shade, protective clothing, SPF 30+ sunscreen, and sunglasses; watch for bright surfaces like water and snow increasing UV exposure.
The UV index in Tucson, Arizona is often high due to its desert climate and location near the equator. It can reach extreme levels during peak sunlight hours, making sun protection essential for outdoor activities.
Tucson has two main seasons: a hot, dry summer and a mild, wet winter. Summer temperatures can exceed 100°F (38°C), while winter temperatures rarely drop below freezing. Spring and fall are characterized by warm days and cool nights.
Compared to its region and neighboring countries, Tucson is hotter and drier than many other areas in the United States. Its climate is more similar to that of Mexico, which lies to the south, than to cities in the northern or eastern parts of the U.S.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Tucson. It's designed to provide you with a better understanding of the yearly weather and sun exposure.