Boulder County, CO: Current UV Index and Hourly Forecast

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As of 10:30 AM MDT on April 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 3.2.

Over the next 24 hours, the highest UV Index reading in Boulder County, CO is expected to be 7.4 in Nederland between 2:00 PM - 3:00 PM MDT today.

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Current UV Index in Cities in Boulder County, CO

• Allenspark - 3.1
• Altona - 2.8
• Bark Ranch - 3.2
• Bonanza Mountain Estates - 3.2
• Boulder - 2.7
• Crisman - 2.7
• Eldora - 3.2
• Eldorado Springs - 2.7
• Gold Hill - 3.2
• Gunbarrel - 2.7
• Hidden Lake - 3.2
• Jamestown - 3.2
• Lafayette - 2.7
• Lazy Acres - 2.7
• Leyner - 2.7
• Longmont - 3.1
• Louisville - 2.7
• Lyons - 2.8
• Mountain Meadows - 3.2
• Nederland - 3.2
• Niwot - 2.7
• Paragon Estates - 2.7
• Pine Brook Hill - 2.7
• Seven Hills - 2.7
• St. Ann Highlands - 3.2
• Sugarloaf - 3.2
• Sunshine - 2.7
• Superior - 2.7
• Tall Timber - 2.7
• Valmont - 2.7
• Ward - 3.2