Boulder County, CO: Current UV Index and Hourly Forecast

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As of 9:50 PM MDT on April 25, 2026, all 31 cities in Boulder County, CO in our database have a UV Index reading of 0, indicating no radiation from the sun.

Over the next 24 hours, the highest UV Index reading in Boulder County, CO is expected to be 7 in Lafayette between 12:00 PM - 1:00 PM MDT tomorrow.

Search Cities in Boulder County, CO

Current UV Index in Cities in Boulder County, CO

• Allenspark - 0
• Altona - 0
• Bark Ranch - 0
• Bonanza Mountain Estates - 0
• Boulder - 0
• Crisman - 0
• Eldora - 0
• Eldorado Springs - 0
• Gold Hill - 0
• Gunbarrel - 0
• Hidden Lake - 0
• Jamestown - 0
• Lafayette - 0
• Lazy Acres - 0
• Leyner - 0
• Longmont - 0
• Louisville - 0
• Lyons - 0
• Mountain Meadows - 0
• Nederland - 0
• Niwot - 0
• Paragon Estates - 0
• Pine Brook Hill - 0
• Seven Hills - 0
• St. Ann Highlands - 0
• Sugarloaf - 0
• Sunshine - 0
• Superior - 0
• Tall Timber - 0
• Valmont - 0
• Ward - 0