UV Index
UV Index
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Today's UV index in Phoenix, United States 
will be up to 3.1, indicating moderate risk of harm from the sun's UV rays for the average person. Check our tips for today to make sure you're safe in the sun.
With a UV index reaching up to 3.1 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.
Read more here about the climate and sun exposure in and around Phoenix.
The UV index in Phoenix, United States, can be quite high. During summer, when temperatures soar, the UV index can reach extreme levels, often exceeding 10 out of a possible 11. This means that sun protection is crucial to avoid harmful effects of the sun's rays. It is recommended to use sunscreen with a high SPF, wear protective clothing, and limit sun exposure during peak hours from 10 am to 4 pm.
Phoenix experiences two primary weather seasons: a hot and dry season, and a milder and slightly wetter season. From May to September, temperatures in Phoenix can reach scorching levels, often exceeding 100 °F (38 °C). This period is characterized by clear skies and minimal rainfall. The cooler season, from October to April, brings more moderate temperatures, with highs ranging from 65-80 °F (18-27 °C). Rains are infrequent, but occasional showers occur during this time.
Compared to its region, Phoenix receives ample sunshine throughout the year. The city benefits from its desert location with over 300 sunny days annually. Its proximity to the Sonoran Desert and lack of nearby mountains also contribute to its high sun exposure. This makes Phoenix a popular destination for outdoor activities, but also requires residents and visitors to take precautions against sunburn and heat-related illnesses.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in Phoenix. It's designed to provide you with a better understanding of the yearly weather and sun exposure.