Napa County, CA: Current UV Index and Hourly Forecast

As of 4:16 AM PDT on March 18, 2025, all 11 cities in Napa 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 Napa County, CA is expected to be 4.8 in Napa 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 Napa County, CA as of 4:16 AM PDT, March 18, 2025

Current UV Index in Cities in Napa County, CA

4:16 AM PDT, March 18, 2025