As of 11:29 AM MDT on September 11, 2025, out of 237 cities in Idaho in our database, 131 cities (55%) have a UV Index reading of Moderate, while 106 cities (45%) have a UV Index reading of Low. The city with the highest UV Index reading right now is St. Charles, ID with a reading of 4.2.
Over the next 24 hours, the highest UV Index reading in Idaho is expected to be 6.7 in Franklin between 2:00 PM - 3:00 PM MDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |