As of 1:37 PM MDT on April 1, 2025, all 23 cities in Jefferson County, CO in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Coal Creek, CO with a reading of 6.4.
Over the next 24 hours, the highest UV Index reading in Jefferson County, CO is expected to be 6.4 in Coal Creek 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 |