As of 10:33 AM MDT on July 30, 2025, 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 Grand Lake, CO with a reading of 3.7.
Over the next 24 hours, the highest UV Index reading in Grand County, CO is expected to be 7.6 in Fraser between 1:00 PM - 2:00 PM MDT today.
| Range | 0 - 2 | 3 - 5 | 6 - 7 | 8 - 10 | 11+ |
|---|---|---|---|---|---|
| Color | |||||
| Risk | Low | Moderate | High | Very High | Extreme |