UV Index
UV Index
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Today's UV index in San Diego, United States 
will be up to 6.5, indicating high 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 San Diego's UV index reaching 6.5, protect your skin from harm by staying in shade, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours between 10 a.m. and 4 p.m., when UV rays are strongest.
Read more here about the climate and sun exposure in and around San Diego.
In San Diego, the UV index can reach high levels due to its sunny climate. The UV index measures the strength of the sun's ultraviolet radiation, which can be harmful to the skin. During summer, the UV index ranges from 8 to 11, considered very high to extreme, so it's crucial to protect yourself from the sun and apply sunscreen regularly.
San Diego enjoys a mild Mediterranean climate with warm and dry summers, and mild winters. The city experiences two primary seasons - a dry season from May to October and a wetter season from November to April. Summertime temperatures average around 25 °C (77 °F), while in winter, the average highs range from 18-20 °C (64-68 °F). It's worth mentioning that even during the winter months, San Diego remains relatively pleasant compared to many other cities in the United States.
Compared to its region, San Diego experiences more sun exposure than its neighbors. The city boasts an annual average of 266 sunny days, significantly higher than the nearby city of Los Angeles with 182 sunny days per year. This makes San Diego an excellent destination for outdoor activities, but it's essential to stay protected from the sun's intense rays by wearing hats, sunglasses, and applying SPF to avoid sunburn or skin damage.
The chart above displays the Shortwave Radiation Sum (MJ/m²) for each day of the last year in San Diego. It's designed to provide you with a better understanding of the yearly weather and sun exposure.