UV Index
UV Index
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Today's UV index in San Diego, United States 
will be up to 3.8, 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 3.8 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.
The UV index in San Diego is typically moderate to high, with readings often reaching as high as 11 during peak summer months. This is due to the city's geographical location in Southern California, which provides abundant sunshine throughout the year.
San Diego has two main seasons: a dry season from May to October and a wet season from November to April. During the dry season, temperatures can reach the high 70s and low 80s, while the wet season sees cooler temperatures and occasional rainfall. Despite this, San Diego enjoys mild weather year-round, with temperatures rarely dipping below the mid-50s or exceeding the mid-80s.
Compared to other parts of the United States and its neighboring countries, San Diego's weather is relatively mild and consistent. While cities such as New York and Chicago experience harsh winters and hot summers, San Diego's Mediterranean climate provides a more stable and moderate environment. Similarly, Mexican cities such as Tijuana, just south of San Diego, see more extreme temperature fluctuations and rainfall throughout the year, making San Diego's weather seem even more temperate.
The chart below displays the average Shortwave Radiation Sum (MJ/m²) for each month of the last year in San Diego. It's designed to provide you with a better understanding of the yearly weather and sun exposure.