San Mateo County, CA: Current UV Index and Hourly Forecast

As of 3:13 AM PDT on April 24, 2025, all 33 cities in San Mateo County, CA in our database have a UV Index reading of 0, indicating no radiation from the sun.

Over the next 24 hours, the highest UV Index reading in San Mateo County, CA is expected to be 6.1 in Portola Valley between 1:00 PM - 2:00 PM PDT today.

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UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in San Mateo County, CA as of 3:13 AM PDT, April 24, 2025

Current UV Index in Cities in San Mateo County, CA

3:13 AM PDT, April 24, 2025