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

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As of 2:25 PM PDT on May 14, 2025, out of 33 cities in San Mateo County, CA in our database, 21 cities (64%) have a UV Index reading of Very High, while 12 cities (36%) have a UV Index reading of High. The city with the highest UV Index reading right now is San Mateo, CA with a reading of 8.

Over the next 24 hours, the highest UV Index reading in San Mateo County, CA is expected to be 8.8 in Portola Valley between 1:00 PM - 2:00 PM PDT tomorrow.

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Current UV Index in Cities in San Mateo County, CA

• Atherton - 8
• Baywood Park - 8
• Belmont - 8
• Brisbane - 7.3
• Broadmoor - 7.3
• Burlingame - 8
• Colma - 7.3
• Daly City - 7.3
• East Palo Alto - 8
• El Granada - 7
• Emerald Lake Hills - 8
• Foster City - 8
• Half Moon Bay - 7
• Highlands - 8
• Hillsborough - 8
• La Honda - 7.9
• Ladera - 8
• Loma Mar - 7.9
• Menlo Park - 8
• Millbrae - 7
• Montara - 7
• Moss Beach - 7
• North Fair Oaks - 8
• Pacifica - 7
• Pescadero - 7.9
• Portola Valley - 7.9
• Redwood City - 8
• San Bruno - 7.3
• San Carlos - 8
• San Mateo - 8
• South San Francisco - 7.3
• West Menlo Park - 8
• Woodside - 8