UV Index
UV Index
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Today's UV index in Walnut Creek, United States 
will be up to 4.2, 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 4.2 in Walnut Creek, 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.
Walnut Creek, California experiences a Mediterranean climate with mild, wet winters and warm, dry summers. The UV index is moderate, ranging from 3 in winter to 9 in summer, with an average annual UV index of 5.4.
The weather seasons in Walnut Creek are characterized by cool winters from December to February, with average temperatures around 48°F (9°C). Spring and fall are mild, while summers from June to August are warm, with average temperatures reaching 73°F (23°C).
Compared to the San Francisco Bay Area, Walnut Creek has a slightly warmer and sunnier climate. In contrast to nearby Sacramento, Walnut Creek has a more moderate temperature range. It also differs from neighboring Oregon, which has a cooler and rainier climate, and Nevada, which has a hotter and drier climate.