Marin County, CA: Current UV Index and Hourly Forecast

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As of 11:57 AM PDT on August 31, 2026, all 31 cities in Marin County, CA in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is San Rafael, CA with a reading of 5.2.

Over the next 24 hours, the highest UV Index reading in Marin County, CA is expected to be 7.7 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 - 5.2
• Belvedere - 3.9
• Black Point-Green Point - 5.2
• Bolinas - 4.6
• Corte Madera - 5.2
• Dillon Beach - 5
• Fairfax - 5.2
• Inverness - 4.6
• Kentfield - 5.2
• Lagunitas-Forest Knolls - 4.6
• Larkspur - 5.2
• Lucas Valley-Marinwood - 5.2
• Marin City - 3.9
• Mill Valley - 5.2
• Muir Beach - 3.9
• Nicasio - 4.6
• Novato - 5.2
• Point Reyes Station - 4.6
• Ross - 5.2
• San Anselmo - 5.2
• San Geronimo - 4.6
• San Rafael - 5.2
• Santa Venetia - 5.2
• Sausalito - 3.9
• Sleepy Hollow - 5.2
• Stinson Beach - 4.6
• Strawberry - 5.2
• Tamalpais-Homestead Valley - 5.2
• Tiburon - 5.2
• Tomales - 5
• Woodacre - 4.6