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National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
7-Day Forecast 42.23°N 88.33°W (Text-Only)
NWS Forecast for: Crystal Lake IL
Issued by: National Weather Service Chicago, IL
Last Update: 1:50 am CST Dec 5, 2025		Print

  • Overnight

    Overnight: Mostly cloudy, with a low around 2. Wind chill values as low as -11. South southwest wind around 10 mph, with gusts as high as 15 mph.

    Low: 2 °F

    Mostly Cloudy



  • Friday

    Friday: Mostly cloudy, with a high near 25. Wind chill values as low as -7. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 25 °F

    Mostly Cloudy



  • Friday
    Night

    Friday Night: Patchy snow and freezing rain before 3am. Mostly cloudy, with a low around 21. Southwest wind 10 to 15 mph becoming west northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 30%.

    Low: 21 °F

    Patchy Wintry
    Mix


  • Saturday

    Saturday: Partly sunny, with a high near 24. West northwest wind 5 to 10 mph becoming light and variable in the afternoon.

    High: 24 °F

    Partly Sunny



  • Saturday
    Night

    Saturday Night: Snow, mainly after midnight. Low around 13. Calm wind becoming north around 5 mph after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 80%.

    Low: 13 °F

    Slight Chance
    Snow then
    Snow

  • Sunday

    Sunday: A 50 percent chance of snow before noon. Partly sunny, with a high near 23.

    High: 23 °F

    Chance Snow
    then Mostly
    Sunny

  • Sunday
    Night

    Sunday Night: A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 4.

    Low: 4 °F

    Slight Chance
    Snow Showers
    then Mostly
    Cloudy

  • Monday

    Monday: Partly sunny, with a high near 20.

    High: 20 °F

    Partly Sunny



  • Monday
    Night

    Monday Night: A chance of snow. Mostly cloudy, with a low around 12.

    Low: 12 °F

    Chance Snow





    • Overnight: Mostly cloudy, with a low around 2. Wind chill values as low as -11. South southwest wind around 10 mph, with gusts as high as 15 mph.

    Friday: Mostly cloudy, with a high near 25. Wind chill values as low as -7. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Friday Night: Patchy snow and freezing rain before 3am. Mostly cloudy, with a low around 21. Southwest wind 10 to 15 mph becoming west northwest after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 30%.

    Saturday: Partly sunny, with a high near 24. West northwest wind 5 to 10 mph becoming light and variable in the afternoon.

    Saturday Night: Snow, mainly after midnight. Low around 13. Calm wind becoming north around 5 mph after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 80%.

    Sunday: A 50 percent chance of snow before noon. Partly sunny, with a high near 23.

    Sunday Night: A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 4.

    Monday: Partly sunny, with a high near 20.

    Monday Night: A chance of snow. Mostly cloudy, with a low around 12.

    Tuesday: A chance of snow after noon. Mostly cloudy, with a high near 34.

    Tuesday Night: Snow. Cloudy, with a low around 28.

    Wednesday: A chance of rain and snow. Cloudy, with a high near 34.

    Wednesday Night: A chance of snow. Mostly cloudy, with a low around 10.

    Thursday: Partly sunny, with a high near 20.


    Crystal Lake IL
     42.23°N 88.33°W

    Visit your local NWS office at: https://www.weather.gov/lot