As of 3:53 PM MDT on May 1, 2026, all 237 cities in Idaho in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Ketchum, ID with a reading of 7.3.
Over the next 24 hours, the highest UV Index reading in Idaho is expected to be 8.3 in St. Charles 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 |