UV Index Today in Boulder County, Colorado (CO)

The average maximum UV Index today across 17 locations in Boulder County, Colorado (CO), is 11.7. The highest projected maximum is 12.3 in Coal Creek at 1:00 PM MDT, while the lowest projected maximum is 11.3 in Longmont at 1:00 PM MDT.

Tomorrow, the average maximum UV Index across those same locations is expected to be 11.5. The highest projected maximum is 12.1 in Coal Creek at 1:00 PM MDT, and the lowest projected maximum is 11.1 in Longmont at 1:00 PM MDT.