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.

Overcast

74°F

23°C

Humidity 88%
Wind Speed Calm
Barometer 29.95 in (1012.8 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 19 Aug 3:51 am CDT
Extended Forecast for

Great Lakes IL

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms, mainly before 5am. Cloudy, with a low around 72. West southwest wind around 5 mph.

    Low: 72 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 77. North wind around 10 mph, with gusts as high as 15 mph.

    High: 77 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A chance of sprinkles before 1am, then a chance of sprinkles after 4am. Mostly cloudy, with a low around 67. North wind 5 to 10 mph.

    Low: 67 °F

    Chance
    Sprinkles

  • Wednesday

    Wednesday: A chance of sprinkles before 1pm. Mostly sunny, with a high near 75. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    High: 75 °F

    Chance
    Sprinkles

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 67. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly before 5am. Cloudy, with a low around 72. West southwest wind around 5 mph.
Tuesday
Mostly cloudy, with a high near 77. North wind around 10 mph, with gusts as high as 15 mph.
Tuesday Night
A chance of sprinkles before 1am, then a chance of sprinkles after 4am. Mostly cloudy, with a low around 67. North wind 5 to 10 mph.
Wednesday
A chance of sprinkles before 1pm. Mostly sunny, with a high near 75. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
Mostly clear, with a low around 67. North northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Thursday
Sunny, with a high near 75.
Thursday Night
Mostly clear, with a low around 65.
Friday
Sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 67.
Saturday
Sunny, with a high near 79.
Saturday Night
Mostly clear, with a low around 60.
Sunday
Sunny, with a high near 72.
Sunday Night
Mostly clear, with a low around 56.
Monday
Sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Great Lakes IL
 42.3°N 87.85°W
Last Update:
4:26 am CDT Aug 19, 2025
Forecast Valid:
4am CDT Aug 19, 2025-6pm CDT Aug 25, 2025
 
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