UV Index
UV Index
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Today's UV index in Phoenix, United States 
will be up to 3.9, 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 3.9 in Phoenix, 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.
Phoenix, Arizona has some of the highest UV index readings in the United States, with levels often exceeding 10 on a daily basis, especially in the summer months. This is due to the city's desert location and clear skies, allowing for intense sunlight.
Phoenix has two main seasons: a hot, dry summer and a mild, wet winter. Summer temperatures can exceed 100°F (38°C) from June to September, with little rainfall. Winters are mild, with temperatures ranging from 40-75°F (4-24°C), and occasional rain showers.
Compared to its region and neighboring countries, Phoenix is unique for its hot, arid climate. While much of the southwestern United States and Mexico share similar desert conditions, Phoenix's summer temperatures are consistently higher due to its inland location and higher elevation. The city's dry climate also differs from the humid conditions found in southern Texas and Central America.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in Phoenix. It's designed to provide you with a better understanding of the yearly weather and sun exposure.