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

79°F

26°C

Humidity 85%
Wind Speed W 6 mph
Barometer 29.93 in (1012.1 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 1 Sep 11:51 pm CDT
Extended Forecast for

Waukegan IL

  • Overnight

    Overnight: Mostly clear, with a low around 74. Southwest wind around 5 mph, with gusts as high as 10 mph.

    Low: 74 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 90. Heat index values as high as 97. West southwest wind 5 to 15 mph, with gusts as high as 20 mph.

    High: 90 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after 4am. Partly cloudy, with a low around 72. South southwest wind 5 to 10 mph.

    Low: 72 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly between 7am and 1pm. Partly sunny, with a high near 86. Southwest wind around 5 mph becoming east southeast in the afternoon.

    High: 86 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. East wind around 5 mph.

    Low: 71 °F

    Chance
    T-storms

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.

    High: 82 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

  • Saturday

    Saturday: A chance of showers before 1pm. Mostly sunny, with a high near 81.

    High: 81 °F

    Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 74. Southwest wind around 5 mph, with gusts as high as 10 mph.
Wednesday
Mostly sunny, with a high near 90. Heat index values as high as 97. West southwest wind 5 to 15 mph, with gusts as high as 20 mph.
Wednesday Night
A 20 percent chance of showers after 4am. Partly cloudy, with a low around 72. South southwest wind 5 to 10 mph.
Thursday
A 30 percent chance of showers and thunderstorms, mainly between 7am and 1pm. Partly sunny, with a high near 86. Southwest wind around 5 mph becoming east southeast in the afternoon.
Thursday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. East wind around 5 mph.
Friday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Saturday
A chance of showers before 1pm. Mostly sunny, with a high near 81.
Saturday Night
Partly cloudy, with a low around 69.
Sunday
A chance of showers. Partly sunny, with a high near 80.
Sunday Night
Mostly cloudy, with a low around 66.
Labor Day
Partly sunny, with a high near 77.
Monday Night
Mostly cloudy, with a low around 63.
Tuesday
Partly sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Waukegan IL
 42.37°N 87.85°W
Last Update:
9:06 pm CDT Sep 1, 2026
Forecast Valid:
12am CDT Sep 2, 2026-6pm CDT Sep 8, 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