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.

Mostly Cloudy

31°F

-1°C

Humidity 69%
Wind Speed NE 10 G 20 mph
Barometer 30.40 in (1030.2 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 7 Apr 12:51 am CDT
Extended Forecast for

Grayslake IL

  • Overnight

    Overnight: A 20 percent chance of snow showers before 4am. Mostly cloudy, with a low around 26. North northeast wind around 10 mph, with gusts as high as 15 mph.

    Low: 26 °F

    Slight Chance
    Snow Showers

  • Tuesday

    Tuesday: Sunny, with a high near 37. North northeast wind 5 to 10 mph becoming east in the afternoon.

    High: 37 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of snow showers between 1am and 4am, then a slight chance of rain showers after 4am. Increasing clouds, with a low around 28. East southeast wind 10 to 15 mph. Chance of precipitation is 20%.

    Low: 28 °F

    Mostly Cloudy
    then Slight
    Chance
    Rain/Snow

  • Wednesday

    Wednesday: A 10 percent chance of showers before 7am. Partly sunny, with a high near 65. Breezy, with a south wind 15 to 25 mph, with gusts as high as 35 mph.

    High: 65 °F

    Breezy.
    Slight Chance
    Showers then
    Partly Sunny

  • Wednesday Night

    Wednesday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 50. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.

    Low: 50 °F

    Showers
    Likely and
    Breezy

  • Thursday

    Thursday: A 30 percent chance of showers, mainly after 1pm. Partly sunny, with a high near 64.

    High: 64 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 43. Chance of precipitation is 70%.

    Low: 43 °F

    Showers
    Likely

  • Friday

    Friday: A chance of showers before 1pm. Mostly cloudy, with a high near 56.

    High: 56 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 37.

    Low: 37 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of snow showers before 4am. Mostly cloudy, with a low around 26. North northeast wind around 10 mph, with gusts as high as 15 mph.
Tuesday
Sunny, with a high near 37. North northeast wind 5 to 10 mph becoming east in the afternoon.
Tuesday Night
A slight chance of snow showers between 1am and 4am, then a slight chance of rain showers after 4am. Increasing clouds, with a low around 28. East southeast wind 10 to 15 mph. Chance of precipitation is 20%.
Wednesday
A 10 percent chance of showers before 7am. Partly sunny, with a high near 65. Breezy, with a south wind 15 to 25 mph, with gusts as high as 35 mph.
Wednesday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 50. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 60%.
Thursday
A 30 percent chance of showers, mainly after 1pm. Partly sunny, with a high near 64.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 43. Chance of precipitation is 70%.
Friday
A chance of showers before 1pm. Mostly cloudy, with a high near 56.
Friday Night
Partly cloudy, with a low around 37.
Saturday
Mostly sunny, with a high near 56.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 45.
Sunday
A chance of showers. Mostly cloudy, with a high near 75.
Sunday Night
Showers likely. Mostly cloudy, with a low around 60.
Monday
A chance of showers. Mostly cloudy, with a high near 76.
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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:
11:56 pm CDT Apr 6, 2026
Forecast Valid:
1am CDT Apr 7, 2026-6pm CDT Apr 13, 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