Boone County, IL: Current UV Index and Hourly Forecast

As of 12:30 AM CST on February 28, 2026, all 8 cities in Boone County, IL 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 Boone County, IL is expected to be 2 in Belvidere between 12:00 PM - 1:00 PM CST today.

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UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in Boone County, IL as of 12:30 AM CST, February 28, 2026

Current UV Index in Cities in Boone County, IL

12:30 AM CST, February 28, 2026