As of 1:47 PM PDT on June 18, 2026, out of 4 cities in Alpine County, CA in our database, 3 cities (75%) have a UV Index reading of Extreme, while 1 city (25%) have a UV Index reading of Very High. The city with the highest UV Index reading right now is Mesa Vista, CA with a reading of 11.6.
Over the next 24 hours, the highest UV Index reading in Alpine County, CA is expected to be 11.6 in Mesa Vista between 1:00 PM - 2:00 PM PDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |