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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.
Average Weather in Chicago Illinois, United States. In Chicago, the summers are warm and wet, the winters are freezing and windy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 21Â°F to 83Â°F and is rarely below 3Â°F or above 91Â°F.