Marin County, CA: Current UV Index and Hourly Forecast

• USA →
• California →
• Marin County

As of 1:42 PM PDT on March 20, 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 4.3.

Over the next 24 hours, the highest UV Index reading in Marin County, CA is expected to be 4.8 in Dillon Beach between 2:00 PM - 3:00 PM PDT today.

Search Cities in Marin County, CA

Current UV Index in Cities in Marin County, CA

• Alto - 4.1
• Belvedere - 3.8
• Black Point-Green Point - 4.1
• Bolinas - 4.3
• Corte Madera - 4.1
• Dillon Beach - 4.3
• Fairfax - 4.1
• Inverness - 4.3
• Kentfield - 4.1
• Lagunitas-Forest Knolls - 4.3
• Larkspur - 4.1
• Lucas Valley-Marinwood - 4.1
• Marin City - 3.8
• Mill Valley - 4.1
• Muir Beach - 3.8
• Nicasio - 4.3
• Novato - 4.1
• Point Reyes Station - 4.3
• Ross - 4.1
• San Anselmo - 4.1
• San Geronimo - 4.3
• San Rafael - 4.1
• Santa Venetia - 4.1
• Sausalito - 3.8
• Sleepy Hollow - 4.1
• Stinson Beach - 4.3
• Strawberry - 4.1
• Tamalpais-Homestead Valley - 4.1
• Tiburon - 4.1
• Tomales - 4.3
• Woodacre - 4.3