Marin County, CA: Current UV Index and Hourly Forecast

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As of 8:28 AM PDT on March 22, 2026, all 31 cities in Marin County, CA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is San Rafael, CA with a reading of 0.3.

Over the next 24 hours, the highest UV Index reading in Marin County, CA is expected to be 6.7 in Lagunitas-Forest Knolls between 1:00 PM - 2:00 PM PDT today.

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Current UV Index in Cities in Marin County, CA

• Alto - 0.3
• Belvedere - 0.3
• Black Point-Green Point - 0.3
• Bolinas - 0.3
• Corte Madera - 0.3
• Dillon Beach - 0.2
• Fairfax - 0.3
• Inverness - 0.3
• Kentfield - 0.3
• Lagunitas-Forest Knolls - 0.3
• Larkspur - 0.3
• Lucas Valley-Marinwood - 0.3
• Marin City - 0.3
• Mill Valley - 0.3
• Muir Beach - 0.3
• Nicasio - 0.3
• Novato - 0.3
• Point Reyes Station - 0.3
• Ross - 0.3
• San Anselmo - 0.3
• San Geronimo - 0.3
• San Rafael - 0.3
• Santa Venetia - 0.3
• Sausalito - 0.3
• Sleepy Hollow - 0.3
• Stinson Beach - 0.3
• Strawberry - 0.3
• Tamalpais-Homestead Valley - 0.3
• Tiburon - 0.3
• Tomales - 0.2
• Woodacre - 0.3