UV Index Today in Jefferson County, Colorado (CO)
Friday, May 22, 2026 -12:39 PMMDT (GMT-6)
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The average maximum UV Index today across 29 locations in Jefferson County, Colorado (CO), is 8. The highest projected maximum is 8.4 in Coal Creek at 1:00 PM MDT, while the lowest projected maximum is 7.5 in Westminster at 1:00 PM MDT.
Tomorrow, the average maximum UV Index across those same locations is expected to be 8.3. The highest projected maximum is 8.8 in Highlands Ranch at 1:00 PM MDT, and the lowest projected maximum is 7.8 in Arvada at 12:00 PM MDT.
29 Places in Jefferson County, Colorado (CO)
Maximum UV Index Today