National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

17°F

-8°C

Humidity 62%
Wind Speed W 7 mph
Barometer 29.99 in (1017.8 mb)
Dewpoint 6°F (-14°C)
Visibility 10.00 mi
Wind Chill7°F (-14°C)
Last update 2 Jan 8:51 pm CST
Extended Forecast for

Grayslake IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 16. West northwest wind around 5 mph becoming calm.

    Low: 16 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 27. Calm wind becoming west around 5 mph in the afternoon. Winds could gust as high as 10 mph.

    High: 27 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 13. Northwest wind around 5 mph, with gusts as high as 10 mph.

    Low: 13 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Increasing clouds, with a high near 29. Calm wind becoming south around 5 mph in the afternoon. Winds could gust as high as 10 mph.

    High: 29 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: A slight chance of snow, freezing rain, and sleet before midnight. Mostly cloudy, with a low around 24. South wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.

    Low: 24 °F

    Slight Chance
    Wintry Mix
    then Mostly
    Cloudy

  • Monday

    Monday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 31.

    Low: 31 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 44.

    High: 44 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 16. West northwest wind around 5 mph becoming calm.
Saturday
Mostly cloudy, with a high near 27. Calm wind becoming west around 5 mph in the afternoon. Winds could gust as high as 10 mph.
Saturday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 13. Northwest wind around 5 mph, with gusts as high as 10 mph.
Sunday
Increasing clouds, with a high near 29. Calm wind becoming south around 5 mph in the afternoon. Winds could gust as high as 10 mph.
Sunday Night
A slight chance of snow, freezing rain, and sleet before midnight. Mostly cloudy, with a low around 24. South wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 20%.
Monday
Partly sunny, with a high near 40.
Monday Night
Mostly cloudy, with a low around 31.
Tuesday
Partly sunny, with a high near 44.
Tuesday Night
Partly cloudy, with a low around 30.
Wednesday
Mostly sunny, with a high near 44.
Wednesday Night
Partly cloudy, with a low around 34.
Thursday
A chance of rain. Mostly cloudy, with a high near 48.
Thursday Night
Rain likely. Mostly cloudy, with a low around 38.
Friday
A chance of rain. Mostly cloudy, with a high near 46.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.02°W
Last Update:
7:06 pm CST Jan 2, 2026
Forecast Valid:
9pm CST Jan 2, 2026-6pm CST Jan 9, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation