Boulder County, CO: Current UV Index and Hourly Forecast

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As of 6:54 PM MDT on July 4, 2026, all 31 cities in Boulder County, CO in our database have a UV Index reading of Low. The city with the highest UV Index reading right now is Nederland, CO with a reading of 1.1.

Over the next 24 hours, the highest UV Index reading in Boulder County, CO is expected to be 9.9 in Allenspark between 12:00 PM - 1:00 PM MDT tomorrow.

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Current UV Index in Cities in Boulder County, CO

• Allenspark - 0.8
• Altona - 0.7
• Bark Ranch - 1.1
• Bonanza Mountain Estates - 1.1
• Boulder - 0.8
• Crisman - 0.8
• Eldora - 1.1
• Eldorado Springs - 0.8
• Gold Hill - 1.1
• Gunbarrel - 0.8
• Hidden Lake - 1.1
• Jamestown - 1.1
• Lafayette - 0.4
• Lazy Acres - 0.8
• Leyner - 0.4
• Longmont - 0.3
• Louisville - 0.8
• Lyons - 0.7
• Mountain Meadows - 1.1
• Nederland - 1.1
• Niwot - 0.8
• Paragon Estates - 0.8
• Pine Brook Hill - 0.8
• Seven Hills - 0.8
• St. Ann Highlands - 1.1
• Sugarloaf - 1.1
• Sunshine - 0.8
• Superior - 0.8
• Tall Timber - 0.8
• Valmont - 0.8
• Ward - 1.1