Marin County, CA: Current UV Index and Hourly Forecast

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As of 11:48 AM PDT on April 11, 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 Sausalito, CA with a reading of 4.1.

Over the next 24 hours, the highest UV Index reading in Marin County, CA is expected to be 5.8 in Sausalito between 1:00 PM - 2:00 PM PDT today.

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Current UV Index in Cities in Marin County, CA

• Alto - 3.5
• Belvedere - 4.1
• Black Point-Green Point - 3.5
• Bolinas - 4.1
• Corte Madera - 3.5
• Dillon Beach - 3.5
• Fairfax - 3.5
• Inverness - 4.1
• Kentfield - 3.5
• Lagunitas-Forest Knolls - 4.1
• Larkspur - 3.5
• Lucas Valley-Marinwood - 3.5
• Marin City - 4.1
• Mill Valley - 3.5
• Muir Beach - 4.1
• Nicasio - 4.1
• Novato - 3.5
• Point Reyes Station - 4.1
• Ross - 3.5
• San Anselmo - 3.5
• San Geronimo - 4.1
• San Rafael - 3.5
• Santa Venetia - 3.5
• Sausalito - 4.1
• Sleepy Hollow - 3.5
• Stinson Beach - 4.1
• Strawberry - 3.5
• Tamalpais-Homestead Valley - 3.5
• Tiburon - 3.5
• Tomales - 3.5
• Woodacre - 4.1