UV Index Today in Marin County, California (CA)
Sunday, September 20, 2026 -9:23 AM PDT (GMT-7)
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The average maximum UV Index today across 29 locations in Marin County, California (CA), is 5.7. The highest projected maximum is 6.7 in Petaluma Center at 1:00 PM PDT, while the lowest projected maximum is 5.1 in San Francisco at 12:00 PM PDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 6.4. The highest projected maximum is 6.5 in San Rafael at 1:00 PM PDT, and the lowest projected maximum is 5.8 in Bodega Bay at 1:00 PM PDT.
29 Places in Marin County, California (CA)
Maximum UV Index Today