Napa County, CA: Current UV Index and Hourly Forecast

As of 11:49 PM PDT on June 27, 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 10.3 in St. Helena between 1:00 PM - 2:00 PM PDT tomorrow.

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UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in Napa County, CA as of 11:49 PM PDT, June 27, 2025

Current UV Index in Cities in Napa County, CA

11:49 PM PDT, June 27, 2025