Grundy County, IL: Current UV Index and Hourly Forecast

As of 1:02 AM CST on January 13, 2026, all 11 cities in Grundy 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 Grundy County, IL is expected to be 1.2 in Morris between 11:00 AM - 12:00 PM CST today.

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UV Index Risk Levels
Range0 - 23 - 56 - 78 - 1011+
Color
RiskLowModerateHighVery HighExtreme
UV Index in Grundy County, IL as of 1:02 AM CST, January 13, 2026

Current UV Index in Cities in Grundy County, IL

1:02 AM CST, January 13, 2026