UV Index
UV Index
Today's UV index in Palo Alto, United States 
will be up to 8.9, indicating a very high level of sun exposure for the average person. Check our tips for today to make sure you're safe in the sun.
Last checked: 2025-05-09
With a UV index of 8.9 in Palo Alto, it's crucial to safeguard your skin from harmful UV rays. Protect yourself by minimizing sun exposure, wearing protective clothing, and applying SPF 30+ sunscreen every 2 hours.
Palo Alto's UV index is usually moderate, ranging from 3 to 7 depending on the season. It reaches higher levels in summer, often between 8 and 10 during peak midday hours. UV exposure is lower in winter months.
Palo Alto has warm, dry summers with temperatures around 75-85°F and mild, wet winters with temperatures between 45-60°F. Most rain falls from November to March, while summer months are mostly sunny and dry, typical of a Mediterranean climate.
Compared to the wider California Bay Area, Palo Alto is slightly warmer and drier, especially in summer. Compared to neighboring states like Oregon or Nevada, it has milder winters and less snowfall, with less humidity than coastal areas to the west.
See the UV index hour by hour for Palo Alto, along with the temperature and how cloudy it is. If the UV level is higher than moderate, it's best to avoid direct sunlight.