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Hourly Forecast Detailed. 1  0am:The Winnebago, IL forecast for Mar 14 is 21 degrees and Light snow. There is 87 percentage chance of rain and 14 mph winds from the North-Northeast. 2  3am:The Winnebago, IL forecast for Mar 14 is 19 degrees and Partly cloudy. There is 86 percentage chance of rain and 13 mph winds from the North.
The highest temperature reported in Illinois was 117Â°F in East St. Louis on July 14, 1954. The lowest temperature reported in Illinois was -36Â°F in Congerville on January 5, 1999. The most rainfall from a single event was 16.94 inches in Aurora during a 24-hour period spanning July 17-18, 1996.