As of 3:28 PM MDT on May 18, 2026, out of 9 cities in Summit County, CO in our database, 7 cities (78%) have a UV Index reading of High, while 2 cities (22%) have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Montezuma, CO with a reading of 7.1.
Over the next 24 hours, the highest UV Index reading in Summit County, CO is expected to be 9 in Heeney between 2:00 PM - 3:00 PM MDT tomorrow.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |