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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 July in Macomb Illinois, United States. In Macomb, the month of July is characterized by essentially constant daily high temperatures, with daily highs around 85Â°F throughout the month, rarely exceeding 94Â°F or dropping below 77Â°F. The highest daily average high temperature is 86Â°F on July 20.