Napa County, CA: Current UV Index and Hourly Forecast

As of 11:54 PM PDT on September 15, 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 7.3 in St. Helena between 1:00 PM - 2:00 PM PDT tomorrow.

Search Cities in Napa County, CA

UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in Napa County, CA as of 11:54 PM PDT, September 15, 2025

Current UV Index in Cities in Napa County, CA

11:54 PM PDT, September 15, 2025