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.

Mostly Cloudy

41°F

5°C

Humidity 39%
Wind Speed SW 12 mph
Barometer 29.84 in (1012.0 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill34°F (1°C)
Last update 26 Feb 3:51 pm CST
Extended Forecast for

Grayslake IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 28. West southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 28 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 60. Breezy, with a southwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 35 mph.

    High: 60 °F

    Sunny and
    Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 28. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 28 °F

    Partly Cloudy

  • Saturday

    Saturday: Snow likely, mainly after noon. Mostly cloudy, with a high near 33. North wind 5 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.

    High: 33 °F

    Snow Likely

  • Saturday Night

    Saturday Night: A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 18. North wind 5 to 10 mph, with gusts as high as 20 mph.

    Low: 18 °F

    Chance Snow
    then Mostly
    Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 30.

    High: 30 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 19.

    Low: 19 °F

    Chance Snow

  • Monday

    Monday: Mostly sunny, with a high near 35.

    High: 35 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 23.

    Low: 23 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming clear, with a low around 28. West southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Friday
Sunny, with a high near 60. Breezy, with a southwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 35 mph.
Friday Night
Partly cloudy, with a low around 28. Northwest wind 10 to 15 mph, with gusts as high as 20 mph.
Saturday
Snow likely, mainly after noon. Mostly cloudy, with a high near 33. North wind 5 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of 1 to 2 inches possible.
Saturday Night
A 30 percent chance of snow before midnight. Mostly cloudy, with a low around 18. North wind 5 to 10 mph, with gusts as high as 20 mph.
Sunday
Partly sunny, with a high near 30.
Sunday Night
A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 19.
Monday
Mostly sunny, with a high near 35.
Monday Night
Mostly cloudy, with a low around 23.
Tuesday
A chance of rain and snow after noon. Mostly cloudy, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 27.
Wednesday
A chance of rain. Mostly cloudy, with a high near 46.
Wednesday Night
Rain likely. Mostly cloudy, with a low around 35.
Thursday
Rain likely. Partly sunny, with a high near 53.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.02°W
Last Update:
4:36 pm CST Feb 26, 2026
Forecast Valid:
4pm CST Feb 26, 2026-6pm CST Mar 5, 2026
 
Forecast Discussion
 
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Additional Resources

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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