As of 2:58 PM PDT on April 23, 2026, out of 1591 cities in California in our database, 866 cities (54%) have a UV Index reading of Very High, while 725 cities (46%) have a UV Index reading of High. The city with the highest UV Index reading right now is Mono City, CA with a reading of 10.1.
Over the next 24 hours, the highest UV Index reading in California is expected to be 10.1 in Mono City between 2:00 PM - 3:00 PM PDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |