As of 2:27 PM MDT on May 20, 2026, out of 8 cities in Larimer County, CO in our database, 4 cities (50%) have a UV Index reading of Very High, 2 cities (25%) have a UV Index reading of Moderate, while 2 cities (25%) have a UV Index reading of High. The city with the highest UV Index reading right now is Fort Collins, CO with a reading of 7.5.
Over the next 24 hours, the highest UV Index reading in Larimer County, CO is expected to be 8.3 in Berthoud 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 |