As of 3:46 PM MDT on May 21, 2026, all 8 cities in Fremont County, ID in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Ashton, ID with a reading of 5.4.
Over the next 24 hours, the highest UV Index reading in Fremont County, ID is expected to be 6.8 in St. Anthony between 1:00 PM - 2:00 PM MDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |