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

23°F

-5°C

Humidity 74%
Wind Speed NW 3 mph
Barometer 30.42 in (1031.7 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Last update 1 Mar 5:51 am CST
Extended Forecast for

Grayslake IL

  • Today

    Today: A slight chance of flurries before 10am. Partly sunny, with a high near 31. East northeast wind 5 to 10 mph.

    High: 31 °F

    Slight Chance
    Flurries

  • Tonight

    Tonight: Mostly cloudy, with a low around 23. East wind around 5 mph, with gusts as high as 10 mph.

    Low: 23 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 41. Southeast wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 41 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 40 percent chance of showers after midnight. Mostly cloudy, with a low around 33. East southeast wind around 5 mph.

    Low: 33 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Showers likely, mainly before noon. Cloudy, with a high near 42. East wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 70%.

    High: 42 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 35.

    Low: 35 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 44. Chance of precipitation is 50%.

    High: 44 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers. Cloudy, with a low around 39.

    Low: 39 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers. Cloudy, with a high near 49.

    High: 49 °F

    Chance
    Showers

Detailed Forecast

Today
A slight chance of flurries before 10am. Partly sunny, with a high near 31. East northeast wind 5 to 10 mph.
Tonight
Mostly cloudy, with a low around 23. East wind around 5 mph, with gusts as high as 10 mph.
Monday
Mostly sunny, with a high near 41. Southeast wind 5 to 10 mph, with gusts as high as 15 mph.
Monday Night
A 40 percent chance of showers after midnight. Mostly cloudy, with a low around 33. East southeast wind around 5 mph.
Tuesday
Showers likely, mainly before noon. Cloudy, with a high near 42. East wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 70%.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 35.
Wednesday
A chance of showers, with thunderstorms also possible after noon. Mostly cloudy, with a high near 44. Chance of precipitation is 50%.
Wednesday Night
A chance of showers. Cloudy, with a low around 39.
Thursday
A chance of showers. Cloudy, with a high near 49.
Thursday Night
A chance of showers. Mostly cloudy, with a low around 41.
Friday
Showers likely. Cloudy, with a high near 64.
Friday Night
Showers likely. Mostly cloudy, with a low around 43.
Saturday
A chance of showers. Mostly cloudy, with a high near 56.
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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:
2:46 am CST Mar 1, 2026
Forecast Valid:
6am CST Mar 1, 2026-6pm CST Mar 7, 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