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.

Fog/Mist

41°F

5°C

Humidity 96%
Wind Speed NE 5 mph
Barometer 29.90 in (1012.4 mb)
Dewpoint 40°F (4°C)
Visibility 3.00 mi
Wind Chill38°F (3°C)
Last update 31 Mar 5:51 pm CDT
Extended Forecast for

Grayslake IL

  • Tonight

    Tonight: Showers and thunderstorms likely before 8pm, then a slight chance of showers between 8pm and 10pm. Cloudy, with a low around 34. North northeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 34 °F

    T-storms
    Likely then
    Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of showers, mainly after 5pm. Mostly cloudy, with a high near 44. East northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 44 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7pm. Low around 39. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 39 °F

    Showers

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 71. Breezy, with an east southeast wind 15 to 25 mph becoming south in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 100%.

    High: 71 °F

    Breezy.
    Showers
    Likely then
    Showers

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 45. Breezy, with a west southwest wind 20 to 25 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 30 mph.

    Low: 45 °F

    Chance
    Showers and
    Breezy

  • Friday

    Friday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 44. Chance of precipitation is 90%.

    Low: 44 °F

    Showers
    Likely then
    Showers

  • Saturday

    Saturday: A chance of showers. Mostly cloudy, with a high near 60.

    High: 60 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Showers and thunderstorms likely before 8pm, then a slight chance of showers between 8pm and 10pm. Cloudy, with a low around 34. North northeast wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
A 30 percent chance of showers, mainly after 5pm. Mostly cloudy, with a high near 44. East northeast wind around 15 mph, with gusts as high as 25 mph.
Wednesday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7pm. Low around 39. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
Thursday
Showers and possibly a thunderstorm. High near 71. Breezy, with an east southeast wind 15 to 25 mph becoming south in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 100%.
Thursday Night
A 50 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 45. Breezy, with a west southwest wind 20 to 25 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 30 mph.
Friday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 63.
Friday Night
Showers and possibly a thunderstorm. Low around 44. Chance of precipitation is 90%.
Saturday
A chance of showers. Mostly cloudy, with a high near 60.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
Partly sunny, with a high near 47.
Sunday Night
Mostly clear, with a low around 30.
Monday
Mostly sunny, with a high near 54.
Monday Night
Mostly cloudy, with a low around 37.
Tuesday
Partly sunny, with a high near 53.
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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:
3:31 pm CDT Mar 31, 2026
Forecast Valid:
6pm CDT Mar 31, 2026-6pm CDT Apr 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