Boulder County, CO: Current UV Index and Hourly Forecast

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As of 3:16 PM MDT on April 21, 2025, all 31 cities in Boulder County, CO in our database have a UV Index reading of High. The city with the highest UV Index reading right now is Nederland, CO with a reading of 6.4.

Over the next 24 hours, the highest UV Index reading in Boulder County, CO is expected to be 8.2 in Allenspark between 1:00 PM - 2:00 PM MDT tomorrow.

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Current UV Index in Cities in Boulder County, CO

• Allenspark - 6.3
• Altona - 6
• Bark Ranch - 6.4
• Bonanza Mountain Estates - 6.4
• Boulder - 6.1
• Crisman - 6.1
• Eldora - 6.4
• Eldorado Springs - 6.1
• Gold Hill - 6.4
• Gunbarrel - 6.1
• Hidden Lake - 6.4
• Jamestown - 6.4
• Lafayette - 5.9
• Lazy Acres - 6.1
• Leyner - 5.9
• Longmont - 5.8
• Louisville - 6.1
• Lyons - 6
• Mountain Meadows - 6.4
• Nederland - 6.4
• Niwot - 6.1
• Paragon Estates - 6.1
• Pine Brook Hill - 6.1
• Seven Hills - 6.1
• St. Ann Highlands - 6.4
• Sugarloaf - 6.4
• Sunshine - 6.1
• Superior - 6.1
• Tall Timber - 6.1
• Valmont - 6.1
• Ward - 6.4