UV Index Today in Boulder County, Colorado (CO)

The average maximum UV Index today across 17 locations in Boulder County, Colorado (CO), is 5.5. The highest projected maximum is 5.7 in Allenspark at 1:00 PM MDT, while the lowest projected maximum is 5.3 in Longmont at 1:00 PM MDT.

Tomorrow, the average maximum UV Index across those same locations is expected to be 0.5. The highest projected maximum is 0.9 in Coal Creek at 3:00 PM MDT, and the lowest projected maximum is 0.4 in Boulder at 12:00 PM MDT.