Boulder County, CO: Current UV Index and Hourly Forecast

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As of 9:20 AM MDT on June 28, 2025, all 31 cities in Boulder County, CO in our database have a UV Index reading of Moderate. The city with the highest UV Index reading right now is Nederland, CO with a reading of 3.5.

Over the next 24 hours, the highest UV Index reading in Boulder County, CO is expected to be 11 in Nederland between 1:00 PM - 2:00 PM MDT today.

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Current UV Index in Cities in Boulder County, CO

• Allenspark - 3.5
• Altona - 3.2
• Bark Ranch - 3.5
• Bonanza Mountain Estates - 3.5
• Boulder - 3.3
• Crisman - 3.3
• Eldora - 3.5
• Eldorado Springs - 3.3
• Gold Hill - 3.5
• Gunbarrel - 3.3
• Hidden Lake - 3.5
• Jamestown - 3.5
• Lafayette - 3.1
• Lazy Acres - 3.3
• Leyner - 3.1
• Longmont - 3.1
• Louisville - 3.3
• Lyons - 3.2
• Mountain Meadows - 3.5
• Nederland - 3.5
• Niwot - 3.3
• Paragon Estates - 3.3
• Pine Brook Hill - 3.3
• Seven Hills - 3.3
• St. Ann Highlands - 3.5
• Sugarloaf - 3.5
• Sunshine - 3.3
• Superior - 3.3
• Tall Timber - 3.3
• Valmont - 3.3
• Ward - 3.5