Orange County, CA: Current UV Index and Hourly Forecast

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As of 12:54 PM PDT on July 31, 2025, all 45 cities in Orange County, CA in our database have a UV Index reading of Extreme. The city with the highest UV Index reading right now is Rancho Santa Margarita, CA with a reading of 11.3.

Over the next 24 hours, the highest UV Index reading in Orange County, CA is expected to be 11.9 in Rancho Santa Margarita between 1:00 PM - 2:00 PM PDT today.

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Current UV Index in Cities in Orange County, CA

• Aliso Viejo - 10.5
• Anaheim - 11
• Brea - 10.9
• Buena Park - 10.8
• Costa Mesa - 10.8
• Coto de Caza - 11
• Cypress - 10.8
• Dana Point - 10.5
• Fountain Valley - 10.8
• Fullerton - 10.7
• Garden Grove - 10.8
• Huntington Beach - 10.8
• Irvine - 11
• La Habra - 10.7
• La Palma - 10.8
• Ladera Ranch - 10.5
• Laguna Beach - 10.5
• Laguna Hills - 10.5
• Laguna Niguel - 10.5
• Laguna Woods - 10.5
• Lake Forest - 11
• Las Flores - 11
• Los Alamitos - 10.8
• Midway City - 10.8
• Mission Viejo - 10.5
• Modjeska - 11
• Newport Beach - 10.5
• North Tustin - 11
• Orange - 11
• Placentia - 10.9
• Rancho Mission Viejo - 11
• Rancho Santa Margarita - 11.3
• Rossmoor - 10.8
• San Clemente - 11
• San Juan Capistrano - 10.5
• Santa Ana - 10.8
• Seal Beach - 10.8
• Silverado - 11
• Stanton - 10.8
• Trabuco Canyon - 11.3
• Tustin - 11
• Villa Park - 11
• Westminster - 10.8
• Williams Canyon - 11
• Yorba Linda - 10.9