Santa Clara County, CA: Current UV Index and Hourly Forecast

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As of 10:30 AM PST on February 27, 2026, all 23 cities in Santa Clara County, CA in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Gilroy, CA with a reading of 3.5.

Over the next 24 hours, the highest UV Index reading in Santa Clara County, CA is expected to be 5.4 in Los Altos Hills between 12:00 PM - 1:00 PM PST today.

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Current UV Index in Cities in Santa Clara County, CA

• Alum Rock - 3.4
• Cambrian Park - 3.4
• Campbell - 3.4
• Cupertino - 3.4
• East Foothills - 3.3
• Fruitdale - 3.4
• Gilroy - 3.5
• Lexington Hills - 3.4
• Los Altos - 3.4
• Los Altos Hills - 3.3
• Los Gatos - 3.4
• Loyola - 3.4
• Milpitas - 3.3
• Monte Sereno - 3.4
• Morgan Hill - 3.4
• Mountain View - 3.3
• Palo Alto - 3.3
• San Jose - 3.4
• San Martin - 3.5
• Santa Clara - 3.4
• Saratoga - 3.4
• Stanford - 3.3
• Sunnyvale - 3.3