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.

Overcast

32°F

0°C

Humidity 69%
Wind Speed S 6 mph
Barometer 29.90 in (1014.1 mb)
Dewpoint 23°F (-5°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 26 Feb 10:51 am CST
Extended Forecast for

Grayslake IL

  • Today

    Today: Mostly sunny, with a high near 42. Southwest wind around 10 mph, with gusts as high as 20 mph.

    High: 42 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 30. Southwest wind around 10 mph, with gusts as high as 15 mph.

    Low: 30 °F

    Mostly Clear

  • 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: Increasing clouds, with a low around 28. West southwest wind 10 to 15 mph becoming north northwest after midnight. Winds could gust as high as 25 mph.

    Low: 28 °F

    Increasing
    Clouds

  • Saturday

    Saturday: A 50 percent chance of snow, mainly after noon. Cloudy, with a high near 34. North wind around 10 mph, with gusts as high as 15 mph.

    High: 34 °F

    Slight Chance
    Snow then
    Chance Snow

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 17.

    Low: 17 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 29.

    High: 29 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 19.

    Low: 19 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 33.

    High: 33 °F

    Mostly Cloudy

Detailed Forecast

Today
Mostly sunny, with a high near 42. Southwest wind around 10 mph, with gusts as high as 20 mph.
Tonight
Mostly clear, with a low around 30. Southwest wind around 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
Increasing clouds, with a low around 28. West southwest wind 10 to 15 mph becoming north northwest after midnight. Winds could gust as high as 25 mph.
Saturday
A 50 percent chance of snow, mainly after noon. Cloudy, with a high near 34. North wind around 10 mph, with gusts as high as 15 mph.
Saturday Night
Mostly cloudy, with a low around 17.
Sunday
Mostly cloudy, with a high near 29.
Sunday Night
Mostly cloudy, with a low around 19.
Monday
Mostly cloudy, with a high near 33.
Monday Night
Mostly cloudy, with a low around 23.
Tuesday
Mostly cloudy, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 27.
Wednesday
Mostly cloudy, with a high near 45.
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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:
8:41 am CST Feb 26, 2026
Forecast Valid:
11am CST Feb 26, 2026-6pm CST Mar 4, 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