UV Index
UV Index
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Today's UV index in Palo Alto, United States 
will be up to 4.4, 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 4.4 in Palo Alto, 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.
Palo Alto, California experiences a Mediterranean climate with moderate temperatures and low humidity. The UV index is typically moderate, ranging from 3 to 7, with peak levels during the summer months.
The city has a distinct seasonal pattern, with cool and wet winters from December to February, mild springs from March to May, warm summers from June to August, and dry autumns from September to November.
Compared to neighboring regions, Palo Alto's weather is milder than inland California, with cooler summers and warmer winters. It is also more temperate than neighboring Mexico, with less extreme temperature fluctuations, and has a more pronounced seasonal pattern than Hawaii.