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Crystal Lake, IL 7-Day Night Weather Forecast
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Crystal Lake, IL Weather Forecast
Crystal Lake, IL Weather Forecast Date: 931 AM CDT Wed Sep 16 2026
The area/counties/county of: Mchenry, including the cities of: Crystal Lake, Algonquin, Mchenry, and Woodstock.or toggle through each period.
Rest of Today... Mostly cloudy. Isolated showers early in the afternoon. Scattered showers late. Highs in the upper 60s. Northeast winds around 10 mph. Chance of precipitation 40%.
Tonight... Mostly cloudy. Isolated showers early in the evening, then scattered showers with isolated thunderstorms in the late evening and overnight. Near steady temperature in the lower 60s. Northeast winds 5 to 10 mph in the evening, becoming light and variable. Chance of precipitation 50%.
Thursday... Mostly cloudy. A chance of showers early in the morning. Highs in the mid 70s. North winds around 5 mph. Chance of precipitation 40%.
Thursday Night... Mostly cloudy. Lows in the upper 50s. Northeast winds around 5 mph.
Friday... Mostly cloudy. A slight chance of showers in the morning, then a chance of showers in the afternoon. Highs in the mid 70s. East winds 5 to 10 mph. Chance of precipitation 50%.
Friday Night... Mostly cloudy with a chance of thunderstorms. A chance of showers in the evening, then showers after midnight. Lows in the lower 60s. Chance of precipitation 90%.
Saturday... Showers with a chance of thunderstorms. Highs in the upper 70s. Chance of precipitation 90%.
Saturday Night... Cloudy with a slight chance of thunderstorms. Showers likely, mainly in the evening. 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 chance of showers. Lows in the upper 50s. Chance of precipitation 50%.
Monday... Mostly cloudy with a chance of showers. Highs in the lower 70s. Chance of precipitation 40%.
Monday Night... Mostly cloudy with a 40% chance of showers. Lows in the upper 50s.
POP = Probability of Precipitation
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