As of 1:23 PM MST on December 17, 2025, out of 478 cities in Colorado in our database, 420 cities (88%) have a UV Index reading of Low, while 58 cities (12%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Gunnison, CO with a reading of 3.1.
Over the next 24 hours, the highest UV Index reading in Colorado is expected to be 3.3 in Gunnison between 12:00 PM - 1:00 PM MST tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |