Boulder County, CO: Current UV Index and Hourly Forecast

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As of 6:57 AM MDT on September 9, 2025, 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 6.9 in Longmont between 1:00 PM - 2:00 PM MDT today.

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