Boulder County, CO: Current UV Index and Hourly Forecast

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As of 3:09 PM MDT on March 16, 2026, 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 3.6.

Over the next 24 hours, the highest UV Index reading in Boulder County, CO is expected to be 7.2 in Nederland between 1:00 PM - 2:00 PM MDT tomorrow.

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Current UV Index in Cities in Boulder County, CO

• Allenspark - 3.4
• Altona - 3.1
• Bark Ranch - 3.6
• Bonanza Mountain Estates - 3.6
• Boulder - 3.4
• Crisman - 3.4
• Eldora - 3.6
• Eldorado Springs - 3.4
• Gold Hill - 3.6
• Gunbarrel - 3.4
• Hidden Lake - 3.6
• Jamestown - 3.6
• Lafayette - 3.4
• Lazy Acres - 3.4
• Leyner - 3.4
• Longmont - 3.3
• Louisville - 3.4
• Lyons - 3.1
• Mountain Meadows - 3.6
• Nederland - 3.6
• Niwot - 3.4
• Paragon Estates - 3.4
• Pine Brook Hill - 3.4
• Seven Hills - 3.4
• St. Ann Highlands - 3.6
• Sugarloaf - 3.6
• Sunshine - 3.4
• Superior - 3.4
• Tall Timber - 3.4
• Valmont - 3.4
• Ward - 3.6