Marin County, CA: Current UV Index and Hourly Forecast

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As of 2:54 PM PDT on May 1, 2026, all 31 cities in Marin County, CA in our database 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 6.8.

Over the next 24 hours, the highest UV Index reading in Marin County, CA is expected to be 6.8 in San Rafael between 2:00 PM - 3:00 PM PDT today.

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Current UV Index in Cities in Marin County, CA

• Alto - 6.8
• Belvedere - 6.3
• Black Point-Green Point - 6.8
• Bolinas - 6.3
• Corte Madera - 6.8
• Dillon Beach - 6.1
• Fairfax - 6.8
• Inverness - 6.3
• Kentfield - 6.8
• Lagunitas-Forest Knolls - 6.3
• Larkspur - 6.8
• Lucas Valley-Marinwood - 6.8
• Marin City - 6.3
• Mill Valley - 6.8
• Muir Beach - 6.3
• Nicasio - 6.3
• Novato - 6.8
• Point Reyes Station - 6.3
• Ross - 6.8
• San Anselmo - 6.8
• San Geronimo - 6.3
• San Rafael - 6.8
• Santa Venetia - 6.8
• Sausalito - 6.3
• Sleepy Hollow - 6.8
• Stinson Beach - 6.3
• Strawberry - 6.8
• Tamalpais-Homestead Valley - 6.8
• Tiburon - 6.8
• Tomales - 6.1
• Woodacre - 6.3