Boulder County, CO: Current UV Index and Hourly Forecast

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As of 2:47 PM MDT on May 15, 2026, all 31 cities in Boulder County, CO in our database have a UV Index reading of Very High. The city with the highest UV Index reading right now is Nederland, CO with a reading of 9.4.

Over the next 24 hours, the highest UV Index reading in Boulder County, CO is expected to be 9.4 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 - 9.3
• Altona - 8.8
• Bark Ranch - 9.4
• Bonanza Mountain Estates - 9.4
• Boulder - 8.6
• Crisman - 8.6
• Eldora - 9.4
• Eldorado Springs - 8.6
• Gold Hill - 9.4
• Gunbarrel - 8.6
• Hidden Lake - 9.4
• Jamestown - 9.4
• Lafayette - 8.8
• Lazy Acres - 8.6
• Leyner - 8.8
• Longmont - 8.6
• Louisville - 8.6
• Lyons - 8.8
• Mountain Meadows - 9.4
• Nederland - 9.4
• Niwot - 8.6
• Paragon Estates - 8.6
• Pine Brook Hill - 8.6
• Seven Hills - 8.6
• St. Ann Highlands - 9.4
• Sugarloaf - 9.4
• Sunshine - 8.6
• Superior - 8.6
• Tall Timber - 8.6
• Valmont - 8.6
• Ward - 9.4