UV Index Today in Boulder County, Colorado (CO)
Tuesday, April 7, 2026 - 2:47 AM MDT (GMT-6)
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The average maximum UV Index today across 17 locations in Boulder County, Colorado (CO), is 6.7. The highest projected maximum is 7.4 in Coal Creek at 1:00 PM MDT, while the lowest projected maximum is 6.1 in Lyons at 12:00 PM MDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 7. The highest projected maximum is 7.6 in Coal Creek at 1:00 PM MDT, and the lowest projected maximum is 6.7 in Longmont at 1:00 PM MDT.
17 Places in Boulder County, Colorado (CO)
Maximum UV Index Today