Marin County, CA: Current UV Index and Hourly Forecast

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As of 12:28 PM PDT on April 1, 2025, 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 4.6.

Over the next 24 hours, the highest UV Index reading in Marin County, CA is expected to be 5.3 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 - 4.5
• Belvedere - 4.6
• Black Point-Green Point - 4.5
• Bolinas - 4.4
• Corte Madera - 4.5
• Dillon Beach - 4.6
• Fairfax - 4.5
• Inverness - 4.4
• Kentfield - 4.5
• Lagunitas-Forest Knolls - 4.4
• Larkspur - 4.5
• Lucas Valley-Marinwood - 4.5
• Marin City - 4.6
• Mill Valley - 4.5
• Muir Beach - 4.6
• Nicasio - 4.4
• Novato - 4.5
• Point Reyes Station - 4.4
• Ross - 4.5
• San Anselmo - 4.5
• San Geronimo - 4.4
• San Rafael - 4.5
• Santa Venetia - 4.5
• Sausalito - 4.6
• Sleepy Hollow - 4.5
• Stinson Beach - 4.4
• Strawberry - 4.5
• Tamalpais-Homestead Valley - 4.5
• Tiburon - 4.5
• Tomales - 4.6
• Woodacre - 4.4