As of 4:14 PM MDT on March 17, 2026, out of 478 cities in Colorado in our database, 405 cities (85%) have a UV Index reading of Moderate, while 73 cities (15%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Silverton, CO with a reading of 4.1.
Over the next 24 hours, the highest UV Index reading in Colorado is expected to be 8.6 in Grand Lake 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 |