UV Index Today in San Mateo County, California (CA)
Wednesday, July 15, 2026 -10:20 AM PDT (GMT-7)
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The average maximum UV Index today across 35 locations in San Mateo County, California (CA), is 10. The highest projected maximum is 10.1 in Portola Valley at 1:00 PM PDT, while the lowest projected maximum is 9.8 in San Francisco at 1:00 PM PDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 10. The highest projected maximum is 10.3 in Portola Valley at 1:00 PM PDT, and the lowest projected maximum is 9.6 in Pacifica at 1:00 PM PDT.
35 Places in San Mateo County, California (CA)
Maximum UV Index Today