Marin County, CA: Current UV Index and Hourly Forecast

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As of 2:31 PM PDT on June 11, 2026, all 31 cities in Marin County, CA in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is Sausalito, CA with a reading of 9.6.

Over the next 24 hours, the highest UV Index reading in Marin County, CA is expected to be 10.1 in San Rafael between 1:00 PM - 2:00 PM PDT tomorrow.

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Current UV Index in Cities in Marin County, CA

• Alto - 9.5
• Belvedere - 9.6
• Black Point-Green Point - 9.5
• Bolinas - 9.2
• Corte Madera - 9.5
• Dillon Beach - 9.1
• Fairfax - 9.5
• Inverness - 9.2
• Kentfield - 9.5
• Lagunitas-Forest Knolls - 9.2
• Larkspur - 9.5
• Lucas Valley-Marinwood - 9.5
• Marin City - 9.6
• Mill Valley - 9.5
• Muir Beach - 9.6
• Nicasio - 9.2
• Novato - 9.5
• Point Reyes Station - 9.2
• Ross - 9.5
• San Anselmo - 9.5
• San Geronimo - 9.2
• San Rafael - 9.5
• Santa Venetia - 9.5
• Sausalito - 9.6
• Sleepy Hollow - 9.5
• Stinson Beach - 9.2
• Strawberry - 9.5
• Tamalpais-Homestead Valley - 9.5
• Tiburon - 9.5
• Tomales - 9.1
• Woodacre - 9.2