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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: 631 AM 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.
Today... A slight chance of thunderstorms early in the morning. Showers in the morning, then a slight chance of showers and thunderstorms in the afternoon. Highs in the upper 70s. Southwest winds 10 to 15 mph, becoming west 5 to 10 mph in the afternoon. Chance of precipitation near 100%.
Tonight... Mostly cloudy. A slight chance of showers in the late evening and overnight. Lows in the upper 50s. North winds around 5 mph. Chance of precipitation 20%.
Wednesday... Mostly cloudy. A chance of showers. Highs in the lower 70s. Northeast winds 5 to 10 mph. Chance of precipitation 30%.
Wednesday Night... Mostly cloudy. A chance of showers with a slight chance of thunderstorms. Lows in the lower 60s. East winds around 5 mph in the evening, becoming light and variable. Chance of precipitation 50%.
Thursday... Mostly cloudy. A chance of showers with a slight chance of thunderstorms in the morning. Humid with highs in the mid 70s. North winds around 5 mph. Chance of precipitation 50%.
Thursday Night... Mostly cloudy. A chance of showers after midnight. Lows around 60. Chance of precipitation 30%.
Friday... Mostly cloudy with a 50% chance of showers. Highs in the mid 70s.
Friday Night... Mostly cloudy with a slight chance of thunderstorms. A chance of showers in the evening, then showers likely after midnight. Lows in the lower 60s. Chance of precipitation 60%.
Saturday... Mostly cloudy. A chance of showers in the morning, then showers likely with a chance of thunderstorms in the afternoon. Highs in the upper 70s. Chance of precipitation 70%.
Saturday Night... Mostly cloudy. Showers likely, mainly in the evening. Lows around 60. Chance of precipitation 60%.
Sunday... Mostly cloudy with a chance of showers. Highs in the lower 70s. Chance of precipitation 30%.
Sunday Night... Mostly cloudy. Lows in the mid 50s.
POP = Probability of Precipitation
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