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Village of Grayslake, ILGrayslake, IL 7-Day Night Weather Forecast
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Grayslake, IL Weather Forecast
Grayslake, IL Weather Forecast Date: 605 AM CDT Sat Sep 19 2026
The area/counties/county of: Lake County Il, including the cities of: Waukegan, Buffalo Grove, Mundelein, and Gurnee.or toggle through each period.
Today... Thunderstorms likely in the morning. Showers. A chance of thunderstorms in the afternoon. Some thunderstorms May produce heavy rainfall in the morning. Highs in the mid 70s. Southeast winds 10 to 15 mph, becoming south 5 to 10 mph in the afternoon. Chance of precipitation near 100%.
Tonight... Showers with thunderstorms likely until early morning, then a chance of showers and thunderstorms late. Lows in the lower 60s. East winds around 5 mph, increasing to northeast 10 to 15 mph after midnight. Chance of precipitation near 100%.
Sunday... Mostly cloudy. A chance of thunderstorms early in the morning. A chance of showers in the morning, then a slight chance of showers in the afternoon. Breezy with highs in the upper 60s. Northeast winds 15 to 20 mph with gusts up to 30 mph. Chance of precipitation 50%.
Sunday Night... Mostly cloudy. A slight chance of showers after midnight. Lows in the mid 50s. Northeast winds 15 to 20 mph with gusts up to 25 mph, becoming east 10 to 15 mph after midnight. Chance of precipitation 20%.
Monday... Cloudy. A slight chance of showers. Highs in the mid 60s. Northeast winds 15 to 20 mph with gusts up to 25 mph. Chance of precipitation 20%.
Monday Night... Mostly cloudy. Lows in the lower 50s.
Tuesday... Mostly cloudy. Highs in the lower 60s.
Tuesday Night... Mostly cloudy. Lows in the lower 50s.
Wednesday... Mostly cloudy. Highs in the lower 60s.
Wednesday Night... Mostly cloudy. Lows in the lower 50s.
Thursday... Mostly cloudy. Highs in the mid 60s.
Thursday Night... Mostly cloudy. Lows in the lower 50s.
POP = Probability of Precipitation
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