National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Overcast

21°F

-6°C

Humidity 59%
Wind Speed SW 7 mph
Barometer 30.16 in (1023.2 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 17 Mar 10:51 pm CDT
Extended Forecast for

Grayslake IL

  • Tonight

    Tonight: Snow, mainly after 1am. Temperature rising to around 22 by 4am. South wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of less than one inch possible.

    Low: 18 °F⇑

    Snow

  • Wednesday

    Wednesday: A chance of snow and freezing rain before 7am. Mostly cloudy, with a high near 38. Southwest wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.

    High: 38 °F

    Chance Wintry
    Mix then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 34. Southwest wind around 5 mph, with gusts as high as 10 mph.

    Low: 34 °F

    Mostly Cloudy
    then Chance
    Showers

  • Thursday

    Thursday: A 20 percent chance of showers before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 46. South southwest wind around 5 mph becoming north in the afternoon. Winds could gust as high as 10 mph.

    High: 46 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 34. North northeast wind around 5 mph becoming calm in the evening.

    Low: 34 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 54.

    High: 54 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 38.

    Low: 38 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 45.

    Low: 45 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Snow, mainly after 1am. Temperature rising to around 22 by 4am. South wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. Total nighttime snow accumulation of less than one inch possible.
Wednesday
A chance of snow and freezing rain before 7am. Mostly cloudy, with a high near 38. Southwest wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 30%.
Wednesday Night
A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 34. Southwest wind around 5 mph, with gusts as high as 10 mph.
Thursday
A 20 percent chance of showers before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 46. South southwest wind around 5 mph becoming north in the afternoon. Winds could gust as high as 10 mph.
Thursday Night
Mostly cloudy, with a low around 34. North northeast wind around 5 mph becoming calm in the evening.
Friday
Mostly cloudy, with a high near 54.
Friday Night
Mostly cloudy, with a low around 38.
Saturday
Partly sunny, with a high near 65.
Saturday Night
Mostly cloudy, with a low around 45.
Sunday
Partly sunny, with a high near 59.
Sunday Night
Partly cloudy, with a low around 28.
Monday
Mostly sunny, with a high near 40.
Monday Night
Partly cloudy, with a low around 27.
Tuesday
Mostly cloudy, with a high near 47.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.02°W
Last Update:
8:51 pm CDT Mar 17, 2026
Forecast Valid:
11pm CDT Mar 17, 2026-6pm CDT Mar 24, 2026
 
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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