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Crystal Lake, IL Weather Forecast
Crystal Lake, IL Weather Forecast Date: 341 AM CST Mon Nov 09 2026
The area/counties/county of: Mchenry, including the cities of: Crystal Lake, Algonquin, Mchenry, and Woodstock.or toggle through each period.
Early This Morning... Partly cloudy. Temperatures in the mid 30s. Light and variable winds.
Today... Partly cloudy in the morning, then becoming mostly cloudy. Highs in the upper 50s. Southwest winds around 5 mph, increasing to around 10 mph in the afternoon.
Tonight... Mostly clear. Lows around 40. Southwest winds 5 to 10 mph, becoming northwest after midnight.
Tuesday... Mostly sunny in the morning, then becoming partly cloudy. Highs around 60. Northwest winds around 5 mph.
Tuesday Night... Mostly cloudy. Lows in the upper 30s. Light and variable winds.
Veterans Day... Mostly cloudy. A slight chance of showers in the morning, then a chance of showers in the afternoon. Highs in the lower 50s. Northeast winds 5 to 10 mph. Chance of precipitation 40%.
Wednesday Night... Mostly cloudy with a 20% chance of rain showers. Lows in the mid 30s.
Thursday... Mostly cloudy with a 40% chance of rain showers. Breezy with highs in the lower 40s.
Thursday Night... Mostly cloudy. Lows in the upper 20s.
Friday... Partly cloudy. Highs in the lower 40s.
Friday Night... Partly cloudy in the evening, then clearing. Lows in the mid 20s.
Saturday... Sunny. Highs in the mid 40s.
Saturday Night... Mostly clear. Lows in the lower 30s.
POP = Probability of Precipitation
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