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

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As of 1:42 PM PST on November 19, 2025, all 33 cities in San Mateo County, CA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Pacifica, CA with a reading of 1.2.

Over the next 24 hours, the highest UV Index reading in San Mateo County, CA is expected to be 2.2 in San Mateo between 12:00 PM - 1:00 PM PST tomorrow.

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Current UV Index in Cities in San Mateo County, CA

• Atherton - 1
• Baywood Park - 1
• Belmont - 1
• Brisbane - 1.1
• Broadmoor - 1.1
• Burlingame - 1
• Colma - 1.1
• Daly City - 1.1
• East Palo Alto - 1
• El Granada - 1.2
• Emerald Lake Hills - 1
• Foster City - 1
• Half Moon Bay - 1.2
• Highlands - 1
• Hillsborough - 1
• La Honda - 1.2
• Ladera - 1
• Loma Mar - 1.2
• Menlo Park - 1
• Millbrae - 1.2
• Montara - 1.2
• Moss Beach - 1.2
• North Fair Oaks - 1
• Pacifica - 1.2
• Pescadero - 1.2
• Portola Valley - 1.2
• Redwood City - 1
• San Bruno - 1.1
• San Carlos - 1
• San Mateo - 1
• South San Francisco - 1.1
• West Menlo Park - 1
• Woodside - 1