Boulder County, CO: Current UV Index and Hourly Forecast

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As of 1:44 PM MST on January 6, 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 1.8.

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 tomorrow.

Search Cities in Boulder County, CO

Current UV Index in Cities in Boulder County, CO

• Allenspark - 1.8
• Altona - 1.6
• Bark Ranch - 1.8
• Bonanza Mountain Estates - 1.8
• Boulder - 1.6
• Crisman - 1.6
• Eldora - 1.8
• Eldorado Springs - 1.6
• Gold Hill - 1.8
• Gunbarrel - 1.6
• Hidden Lake - 1.8
• Jamestown - 1.8
• Lafayette - 1.6
• Lazy Acres - 1.6
• Leyner - 1.6
• Longmont - 1.5
• Louisville - 1.6
• Lyons - 1.6
• Mountain Meadows - 1.8
• Nederland - 1.8
• Niwot - 1.6
• Paragon Estates - 1.6
• Pine Brook Hill - 1.6
• Seven Hills - 1.6
• St. Ann Highlands - 1.8
• Sugarloaf - 1.8
• Sunshine - 1.6
• Superior - 1.6
• Tall Timber - 1.6
• Valmont - 1.6
• Ward - 1.8