Cook County, IL: Current UV Index and Hourly Forecast

As of 4:58 AM CDT on June 23, 2025, all 119 cities in Cook 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 Cook County, IL is expected to be 10.5 in Barrington between 1:00 PM - 2:00 PM CDT today.

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UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in Cook County, IL as of 4:58 AM CDT, June 23, 2025

Current UV Index in Cities in Cook County, IL

4:58 AM CDT, June 23, 2025