Marin County, CA: Current UV Index and Hourly Forecast

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As of 5:58 PM PDT on June 13, 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 Lagunitas-Forest Knolls, CA with a reading of 3.4.

Over the next 24 hours, the highest UV Index reading in Marin County, CA is expected to be 8.6 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 - 3.1
• Belvedere - 3.1
• Black Point-Green Point - 3.1
• Bolinas - 3.4
• Corte Madera - 3.1
• Dillon Beach - 3.4
• Fairfax - 3.1
• Inverness - 3.4
• Kentfield - 3.1
• Lagunitas-Forest Knolls - 3.4
• Larkspur - 3.1
• Lucas Valley-Marinwood - 3.1
• Marin City - 3.1
• Mill Valley - 3.1
• Muir Beach - 3.1
• Nicasio - 3.4
• Novato - 3.1
• Point Reyes Station - 3.4
• Ross - 3.1
• San Anselmo - 3.1
• San Geronimo - 3.4
• San Rafael - 3.1
• Santa Venetia - 3.1
• Sausalito - 3.1
• Sleepy Hollow - 3.1
• Stinson Beach - 3.4
• Strawberry - 3.1
• Tamalpais-Homestead Valley - 3.1
• Tiburon - 3.1
• Tomales - 3.4
• Woodacre - 3.4