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

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As of 12:46 PM PDT on April 1, 2025, all 33 cities in San Mateo County, CA in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Daly City, CA with a reading of 4.6.

Over the next 24 hours, the highest UV Index reading in San Mateo County, CA is expected to be 5.3 in Daly City between 1:00 PM - 2:00 PM PDT today.

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Current UV Index in Cities in San Mateo County, CA

• Atherton - 4.4
• Baywood Park - 4.4
• Belmont - 4.4
• Brisbane - 4.6
• Broadmoor - 4.6
• Burlingame - 4.4
• Colma - 4.6
• Daly City - 4.6
• East Palo Alto - 4.4
• El Granada - 4.4
• Emerald Lake Hills - 4.4
• Foster City - 4.4
• Half Moon Bay - 4.4
• Highlands - 4.4
• Hillsborough - 4.4
• La Honda - 2.8
• Ladera - 4.4
• Loma Mar - 2.8
• Menlo Park - 4.4
• Millbrae - 4.4
• Montara - 4.4
• Moss Beach - 4.4
• North Fair Oaks - 4.4
• Pacifica - 4.4
• Pescadero - 2.8
• Portola Valley - 2.8
• Redwood City - 4.4
• San Bruno - 4.6
• San Carlos - 4.4
• San Mateo - 4.4
• South San Francisco - 4.6
• West Menlo Park - 4.4
• Woodside - 4.4