As of 12:21 PM MDT on September 20, 2026, all 9 cities in Garfield County, UT in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Boulder, UT with a reading of 6.8.
Over the next 24 hours, the highest UV Index reading in Garfield County, UT is expected to be 8 in Boulder 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 |