As of 7:20 PM MDT on September 17, 2025, all 331 cities in Utah in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is St. George, UT with a reading of 0.2.
Over the next 24 hours, the highest UV Index reading in Utah is expected to be 8.5 in Boulder 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 |