Boulder County, CO: Current UV Index and Hourly Forecast

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

UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in Boulder County, CO as of 6:57 AM MDT, September 9, 2025

Current UV Index in Cities in Boulder County, CO

6:57 AM MDT, September 9, 2025