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

69°F

21°C

Humidity 100%
Wind Speed NE 5 mph
Barometer 30.03 in (1016.1 mb)
Dewpoint 69°F (21°C)
Visibility 5.00 mi
Last update 14 Aug 4:51 am CDT
Extended Forecast for

Grayslake IL

  • Today

    Today: Mostly cloudy, with a high near 78. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 78 °F

    Mostly Cloudy

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 67. East wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 81. South southeast wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 81 °F

    Showers

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. West wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 60%.

    Low: 70 °F

    Chance
    T-storms then
    Showers
    Likely

  • Sunday

    Sunday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. West northwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 64. Chance of precipitation is 10%.

    Low: 64 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 78. East northeast wind 5 to 10 mph, with gusts as high as 15 mph.
Tonight
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4am. Mostly cloudy, with a low around 67. East wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
Showers and possibly a thunderstorm. High near 81. South southeast wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. West wind around 5 mph, with gusts as high as 10 mph. Chance of precipitation is 60%.
Sunday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. West northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Sunday Night
A slight chance of thunderstorms before 7pm. Partly cloudy, with a low around 64. Chance of precipitation is 10%.
Monday
Mostly sunny, with a high near 77.
Monday Night
Mostly clear, with a low around 60.
Tuesday
Mostly sunny, with a high near 79.
Tuesday Night
A chance of showers after 1am. Mostly cloudy, with a low around 64.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 78.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 61.
Thursday
Mostly sunny, with a high near 74.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grayslake IL
 42.35°N 88.05°W
Last Update:
5:21 am CDT Aug 14, 2026
Forecast Valid:
5am CDT Aug 14, 2026-6pm CDT Aug 20, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation