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

42°F

6°C

Humidity 79%
Wind Speed N 9 G 22 mph
Barometer 29.85 in (1011.1 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill37°F (3°C)
Last update 12 Nov 4:51 am CST
Extended Forecast for

Grayslake IL

  • Overnight

    Overnight: A 20 percent chance of showers. Mostly cloudy, with a low around 36. North wind around 15 mph, with gusts as high as 25 mph.

    Low: 36 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: A 40 percent chance of showers, mainly between 11am and 5pm. Partly sunny, with a high near 41. Breezy, with a north wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 41 °F

    Chance
    Showers and
    Breezy

  • Thursday Night

    Thursday Night: A slight chance of rain showers before midnight, then a slight chance of rain and snow showers between midnight and 1am, then a slight chance of snow showers after 1am. Mostly cloudy, with a low around 30. North wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.

    Low: 30 °F

    Slight Chance
    Showers then
    Slight Chance
    Rain/Snow

  • Friday

    Friday: A chance of snow showers before 9am, then a chance of rain and snow showers between 9am and 10am, then a chance of rain showers after 10am. Partly sunny, with a high near 42. North wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.

    High: 42 °F

    Chance
    Rain/Snow
    then Chance
    Showers

  • Friday Night

    Friday Night: Mostly clear, with a low around 27. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.

    Low: 27 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 46.

    High: 46 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 28.

    Low: 28 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 49.

    High: 49 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers. Mostly cloudy, with a low around 36. North wind around 15 mph, with gusts as high as 25 mph.
Thursday
A 40 percent chance of showers, mainly between 11am and 5pm. Partly sunny, with a high near 41. Breezy, with a north wind 15 to 20 mph, with gusts as high as 30 mph.
Thursday Night
A slight chance of rain showers before midnight, then a slight chance of rain and snow showers between midnight and 1am, then a slight chance of snow showers after 1am. Mostly cloudy, with a low around 30. North wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Friday
A chance of snow showers before 9am, then a chance of rain and snow showers between 9am and 10am, then a chance of rain showers after 10am. Partly sunny, with a high near 42. North wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.
Friday Night
Mostly clear, with a low around 27. North northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday
Mostly sunny, with a high near 46.
Saturday Night
Mostly clear, with a low around 28.
Sunday
Sunny, with a high near 49.
Sunday Night
Mostly clear, with a low around 29.
Monday
Sunny, with a high near 50.
Monday Night
Mostly clear, with a low around 29.
Tuesday
Sunny, with a high near 53.
Tuesday Night
Mostly clear, with a low around 30.
Wednesday
Sunny, with a high near 55.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.02°W
Last Update:
4:41 am CST Nov 12, 2026
Forecast Valid:
5am CST Nov 12, 2026-6pm CST Nov 18, 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