UV Index
UV Index
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Today's UV index in Tucson, United States 
will be up to 3.4, indicating a moderate 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.
With a UV index reaching up to 3.4 in Tucson, stay shaded during midday when the sun is strongest; wear protective clothing, a wide-brimmed hat, UV-blocking sunglasses; apply SPF 30+ sunscreen every 2 hours, even on cloudy days; and be cautious of heightened UV on bright surfaces.
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.