UV Index Today in San Mateo County, California (CA)
Saturday, August 8, 2026 -10:01 AM PDT (GMT-7)
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The average maximum UV Index today across 35 locations in San Mateo County, California (CA), is 9. The highest projected maximum is 9.4 in San Mateo at 1:00 PM PDT, while the lowest projected maximum is 7.8 in Pacifica at 1:00 PM PDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 9.2. The highest projected maximum is 9.6 in Portola Valley at 1:00 PM PDT, and the lowest projected maximum is 8.4 in Pacifica at 1:00 PM PDT.
35 Places in San Mateo County, California (CA)
Maximum UV Index Today