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UV Index in San Diego, US

UV index


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Today's UV index in San Diego, United States United States will be up to 5.7, 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.


Today's tips

With a UV index reaching up to 5.7 in San Diego, 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.

San Diego Weather

Read more here about the climate and sun exposure in and around San Diego.

UV Index in 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.

Weather Seasons

UV index

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.

San Diego's Climate

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.

Annual Sun Radiation

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.


* This page's content about the UV index in San Diego (United States) is for educational and informational purposes only. The developers and data providers are not liable for the accuracy, reliability, or availability of the information. The information is not a substitute for professional medical advice, and the developers and data providers are not medical professionals. Seek advice from a qualified health provider for any medical concerns, and do not disregard medical advice or delay seeking it based on the information provided on this site.