As of 4:38 PM PST on November 18, 2025, all 17 cities in Mariposa County, CA in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Mariposa, CA with a reading of 0.3.
Over the next 24 hours, the highest UV Index reading in Mariposa County, CA is expected to be 3.2 in Yosemite Valley between 11:00 AM - 12:00 PM PST tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |