As of 4:54 PM MDT on May 24, 2026, all 8 cities in Grand County, CO in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Granby, CO with a reading of 4.7.
Over the next 24 hours, the highest UV Index reading in Grand County, CO is expected to be 9.2 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 |