Marin County, CA: Current UV Index and Hourly Forecast

• USA →
• California →
• Marin County

As of 8:16 AM PST on January 20, 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 0.2.

Over the next 24 hours, the highest UV Index reading in Marin County, CA is expected to be 2.4 in San Rafael between 12:00 PM - 1:00 PM PST today.

Search Cities in Marin County, CA

Current UV Index in Cities in Marin County, CA

• Alto - 0.2
• Belvedere - 0.2
• Black Point-Green Point - 0.2
• Bolinas - 0.1
• Corte Madera - 0.2
• Dillon Beach - 0.1
• Fairfax - 0.2
• Inverness - 0.1
• Kentfield - 0.2
• Lagunitas-Forest Knolls - 0.1
• Larkspur - 0.2
• Lucas Valley-Marinwood - 0.2
• Marin City - 0.2
• Mill Valley - 0.2
• Muir Beach - 0.2
• Nicasio - 0.1
• Novato - 0.2
• Point Reyes Station - 0.1
• Ross - 0.2
• San Anselmo - 0.2
• San Geronimo - 0.1
• San Rafael - 0.2
• Santa Venetia - 0.2
• Sausalito - 0.2
• Sleepy Hollow - 0.2
• Stinson Beach - 0.1
• Strawberry - 0.2
• Tamalpais-Homestead Valley - 0.2
• Tiburon - 0.2
• Tomales - 0.1
• Woodacre - 0.1