As of 2:19 PM PDT on May 14, 2025, out of 11 cities in Napa County, CA in our database, 8 cities (73%) have a UV Index reading of High, while 3 cities (27%) have a UV Index reading of Very High. The city with the highest UV Index reading right now is Napa, CA with a reading of 7.6.
Over the next 24 hours, the highest UV Index reading in Napa County, CA is expected to be 8.7 in Napa between 1:00 PM - 2:00 PM PDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |