As of 2:08 PM MDT on September 12, 2026, all 1 cities in San Juan County, CO in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is Silverton, CO with a reading of 8.9.
Over the next 24 hours, the highest UV Index reading in San Juan County, CO is expected to be 8.9 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 |