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

65°F

18°C

Humidity 49%
Wind Speed W 7 mph
Barometer 29.55 in (1000.4 mb)
Dewpoint 45°F (7°C)
Visibility 10.00 mi
Last update 22 Mar 1:51 am CDT
Extended Forecast for

Grayslake IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 40. West wind 10 to 15 mph becoming north northeast. Winds could gust as high as 20 mph.

    Low: 40 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of rain between noon and 4pm. Mostly cloudy, with a temperature falling to around 37 by 4pm. Breezy, with a north northeast wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    High: 42 °F⇓

    Mostly Cloudy
    then Slight
    Chance Rain
    and Breezy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 27. North wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 27 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 43. North wind around 5 mph, with gusts as high as 10 mph.

    High: 43 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 29. East wind around 5 mph becoming south after midnight. Winds could gust as high as 10 mph.

    Low: 29 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 55.

    High: 55 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 55.

    High: 55 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 43.

    Low: 43 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 40. West wind 10 to 15 mph becoming north northeast. Winds could gust as high as 20 mph.
Sunday
A slight chance of rain between noon and 4pm. Mostly cloudy, with a temperature falling to around 37 by 4pm. Breezy, with a north northeast wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Sunday Night
Mostly cloudy, with a low around 27. North wind 10 to 15 mph, with gusts as high as 25 mph.
Monday
Mostly sunny, with a high near 43. North wind around 5 mph, with gusts as high as 10 mph.
Monday Night
Mostly cloudy, with a low around 29. East wind around 5 mph becoming south after midnight. Winds could gust as high as 10 mph.
Tuesday
Mostly cloudy, with a high near 55.
Tuesday Night
Mostly cloudy, with a low around 39.
Wednesday
Mostly cloudy, with a high near 55.
Wednesday Night
Mostly cloudy, with a low around 43.
Thursday
A chance of showers. Mostly cloudy, with a high near 64.
Thursday Night
Mostly cloudy, with a low around 30.
Friday
Partly sunny, with a high near 42.
Friday Night
Mostly clear, with a low around 27.
Saturday
Sunny, with a high near 51.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.02°W
Last Update:
1:21 am CDT Mar 22, 2026
Forecast Valid:
2am CDT Mar 22, 2026-6pm CDT Mar 28, 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