As of 2:38 PM MDT on October 18, 2025, out of 478 cities in Colorado in our database, 473 cities (99%) have a UV Index reading of Moderate, 3 cities (1%) have a UV Index reading of High, while 2 cities (0%) have a UV Index reading of Low. The city with the highest UV Index reading right now is Silverton, CO with a reading of 5.5.
Over the next 24 hours, the highest UV Index reading in Colorado is expected to be 5.5 in Silverton 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 |