Boulder County, CO: Current UV Index and Hourly Forecast

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As of 8:07 AM MST on January 7, 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 Lafayette, CO with a reading of 0.2.

Over the next 24 hours, the highest UV Index reading in Boulder County, CO is expected to be 2.2 in Nederland between 12:00 PM - 1:00 PM MST today.

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Current UV Index in Cities in Boulder County, CO

• Allenspark - 0.2
• Altona - 0.1
• Bark Ranch - 0.2
• Bonanza Mountain Estates - 0.2
• Boulder - 0.1
• Crisman - 0.1
• Eldora - 0.2
• Eldorado Springs - 0.1
• Gold Hill - 0.2
• Gunbarrel - 0.1
• Hidden Lake - 0.2
• Jamestown - 0.2
• Lafayette - 0.2
• Lazy Acres - 0.1
• Leyner - 0.2
• Longmont - 0.1
• Louisville - 0.1
• Lyons - 0.1
• Mountain Meadows - 0.2
• Nederland - 0.2
• Niwot - 0.1
• Paragon Estates - 0.1
• Pine Brook Hill - 0.1
• Seven Hills - 0.1
• St. Ann Highlands - 0.2
• Sugarloaf - 0.2
• Sunshine - 0.1
• Superior - 0.1
• Tall Timber - 0.1
• Valmont - 0.1
• Ward - 0.2