Marin County, CA: Current UV Index and Hourly Forecast

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As of 12:58 PM PDT on May 22, 2026, out of 31 cities in Marin County, CA in our database, 17 cities (55%) have a UV Index reading of Very High, while 14 cities (45%) have a UV Index reading of High. The city with the highest UV Index reading right now is San Rafael, CA with a reading of 7.7.

Over the next 24 hours, the highest UV Index reading in Marin County, CA is expected to be 8.4 in San Rafael between 1:00 PM - 2:00 PM PDT today.

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Current UV Index in Cities in Marin County, CA

• Alto - 7.7
• Belvedere - 7
• Black Point-Green Point - 7.7
• Bolinas - 7.3
• Corte Madera - 7.7
• Dillon Beach - 7.3
• Fairfax - 7.7
• Inverness - 7.3
• Kentfield - 7.7
• Lagunitas-Forest Knolls - 7.3
• Larkspur - 7.7
• Lucas Valley-Marinwood - 7.7
• Marin City - 7
• Mill Valley - 7.7
• Muir Beach - 7
• Nicasio - 7.3
• Novato - 7.7
• Point Reyes Station - 7.3
• Ross - 7.7
• San Anselmo - 7.7
• San Geronimo - 7.3
• San Rafael - 7.7
• Santa Venetia - 7.7
• Sausalito - 7
• Sleepy Hollow - 7.7
• Stinson Beach - 7.3
• Strawberry - 7.7
• Tamalpais-Homestead Valley - 7.7
• Tiburon - 7.7
• Tomales - 7.3
• Woodacre - 7.3