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City of Marengo, ILMarengo, IL 7-Day Night Weather Forecast
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Marengo, IL Weather Forecast
Marengo, IL Weather Forecast Date: 911 PM CDT Tue Sep 15 2026
The area/counties/county of: Mchenry, including the cities of: Crystal Lake, Algonquin, Mchenry, and Woodstock.or toggle through each period.
Rest of Tonight... Cloudy. A chance of showers and a slight chance of thunderstorms. Lows around 60. North winds 5 to 10 mph. Chance of precipitation 40%.
Wednesday... Mostly cloudy. A slight chance of showers and thunderstorms. Highs in the lower 70s. Northeast winds 5 to 10 mph. Chance of precipitation 20%.
Wednesday Night... Mostly cloudy. A slight chance of showers and thunderstorms in the evening, then a chance of showers and thunderstorms after midnight. Lows in the lower 60s. East winds around 5 mph in the evening, becoming light and variable. Chance of precipitation 40%.
Thursday... Mostly cloudy. A chance of showers and thunderstorms in the morning. Highs in the mid 70s. North winds around 5 mph. Chance of precipitation 40%.
Thursday Night... Mostly cloudy. Lows in the lower 60s. Northeast winds around 5 mph.
Friday... Mostly cloudy with a chance of thunderstorms. A chance of showers in the morning, then showers likely in the afternoon. Highs in the lower 70s. Chance of precipitation 60%.
Friday Night... Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the lower 60s. Chance of precipitation 70%.
Saturday... Showers with a slight chance of thunderstorms in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of precipitation 80%.
Saturday Night... A chance of thunderstorms in the evening. Showers likely. Lows in the lower 60s. Chance of precipitation 70%.
Sunday... Mostly cloudy with a 50% chance of showers. Highs in the lower 70s.
Sunday Night... Mostly cloudy with a 40% chance of showers. Lows in the upper 50s.
Monday... Mostly cloudy with a 30% chance of showers. Highs in the lower 70s.
Monday Night... Mostly cloudy. Lows in the mid 50s.
POP = Probability of Precipitation
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