As of 1:58 PM MDT on August 31, 2026, out of 237 cities in Idaho in our database, 214 cities (90%) have a UV Index reading of High, while 23 cities (10%) have a UV Index reading of Very High. The city with the highest UV Index reading right now is St. Charles, ID with a reading of 8.1.
Over the next 24 hours, the highest UV Index reading in Idaho is expected to be 8.1 in St. Charles between 1:00 PM - 2:00 PM MDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |