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.

Partly Cloudy

46°F

8°C

Humidity 56%
Wind Speed E 8 mph
Barometer 30.31 in (1027.4 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 11 Apr 3:51 pm CDT
Extended Forecast for

Grayslake IL

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 7pm. Mostly cloudy, with a low around 45. East southeast wind 10 to 15 mph becoming south after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 50%.

    Low: 45 °F

    Chance
    Showers

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms, mainly after 3pm. Mostly cloudy, with a high near 76. Breezy, with a south southwest wind 15 to 25 mph, with gusts as high as 35 mph.

    High: 76 °F

    Chance
    Showers and
    Breezy

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely before 10pm, then showers between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 60. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 60 °F

    Showers and
    Breezy

  • Monday

    Monday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 75. Southwest wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 75 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 64 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of thunderstorms before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 50%.

    High: 80 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 60. Chance of precipitation is 80%.

    Low: 60 °F

    Showers

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 74.

    High: 74 °F

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 54.

    Low: 54 °F

    Chance
    Showers

Detailed Forecast

Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 7pm. Mostly cloudy, with a low around 45. East southeast wind 10 to 15 mph becoming south after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 50%.
Sunday
A 40 percent chance of showers and thunderstorms, mainly after 3pm. Mostly cloudy, with a high near 76. Breezy, with a south southwest wind 15 to 25 mph, with gusts as high as 35 mph.
Sunday Night
Showers and thunderstorms likely before 10pm, then showers between 10pm and 1am, then showers and possibly a thunderstorm after 1am. Low around 60. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Monday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 75. Southwest wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64. South southwest wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
A slight chance of thunderstorms before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 50%.
Tuesday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 60. Chance of precipitation is 80%.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 74.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 54.
Thursday
Mostly sunny, with a high near 74.
Thursday Night
Mostly clear, with a low around 53.
Friday
A chance of showers. Mostly sunny, with a high near 77.
Friday Night
Showers likely. Mostly cloudy, with a low around 46.
Saturday
A chance of showers. Partly sunny, with a high near 60.
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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:
3:41 pm CDT Apr 11, 2026
Forecast Valid:
4pm CDT Apr 11, 2026-6pm CDT Apr 18, 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