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

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As of 12:58 PM PST on December 9, 2025, all 23 cities in Santa Clara County, CA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is San Jose, CA with a reading of 2.4.

Over the next 24 hours, the highest UV Index reading in Santa Clara County, CA is expected to be 2.4 in San Jose 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 - 2.4
• Cambrian Park - 2.4
• Campbell - 2.4
• Cupertino - 2.4
• East Foothills - 2.4
• Fruitdale - 2.4
• Gilroy - 2.4
• Lexington Hills - 2.4
• Los Altos - 2.4
• Los Altos Hills - 2.4
• Los Gatos - 2.4
• Loyola - 2.4
• Milpitas - 2.3
• Monte Sereno - 2.4
• Morgan Hill - 2.4
• Mountain View - 2.3
• Palo Alto - 2.3
• San Jose - 2.4
• San Martin - 2.4
• Santa Clara - 2.4
• Saratoga - 2.4
• Stanford - 2.3
• Sunnyvale - 2.3