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.

Fair

69°F

21°C

Humidity 61%
Wind Speed Vrbl 6 mph
Barometer 30.08 in (1018.1 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 24 Aug 10:51 am CDT
Extended Forecast for

Great Lakes IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 73. North wind 5 to 10 mph becoming east.

    High: 73 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 58. East wind around 5 mph becoming southwest after midnight.

    Low: 58 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 78. Southwest wind 5 to 10 mph becoming south southeast in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 64. South southwest wind 5 to 10 mph.

    Low: 64 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 82. South southwest wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    High: 82 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of thunderstorms before 7pm. Mostly clear, with a low around 64. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 76.

    High: 76 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 73. North wind 5 to 10 mph becoming east.
Tonight
Mostly clear, with a low around 58. East wind around 5 mph becoming southwest after midnight.
Tuesday
Mostly sunny, with a high near 78. Southwest wind 5 to 10 mph becoming south southeast in the afternoon.
Tuesday Night
Partly cloudy, with a low around 64. South southwest wind 5 to 10 mph.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 82. South southwest wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Wednesday Night
A chance of thunderstorms before 7pm. Mostly clear, with a low around 64. Chance of precipitation is 30%.
Thursday
Sunny, with a high near 80.
Thursday Night
Mostly clear, with a low around 64.
Friday
Sunny, with a high near 76.
Friday Night
Partly cloudy, with a low around 65.
Saturday
Partly sunny, with a high near 78.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 68.
Sunday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Great Lakes IL
 42.3°N 87.85°W
Last Update:
12:10 pm CDT Aug 24, 2026
Forecast Valid:
12pm CDT Aug 24, 2026-6pm CDT Aug 30, 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