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.

Overcast

45°F

7°C

Humidity 90%
Wind Speed N 8 mph
Barometer 30.22 in (1023.8 mb)
Dewpoint 42°F (6°C)
Visibility 10.00 mi
Wind Chill41°F (5°C)
Last update 10 Apr 9:51 am CDT
Extended Forecast for

Winthrop Harbor IL

  • Today

    Today: Mostly cloudy, with a high near 46. North wind 5 to 10 mph.

    High: 46 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 35. Northeast wind around 5 mph.

    Low: 35 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Increasing clouds, with a high near 45. Southeast wind 5 to 10 mph.

    High: 45 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Cloudy, with a temperature rising to around 48 by 5am. Southeast wind 5 to 15 mph. Chance of precipitation is 30%.

    Low: 42 °F⇑

    Chance
    Showers

  • Sunday

    Sunday: A chance of showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 68. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.

    High: 68 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    Low: 58 °F

    Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 72. Southwest wind 10 to 15 mph.

    High: 72 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 57. South wind around 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 57 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 72. Chance of precipitation is 60%.

    High: 72 °F

    Chance
    Showers then
    Showers
    Likely

Detailed Forecast

Today
Mostly cloudy, with a high near 46. North wind 5 to 10 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 35. Northeast wind around 5 mph.
Saturday
Increasing clouds, with a high near 45. Southeast wind 5 to 10 mph.
Saturday Night
A chance of showers and thunderstorms. Cloudy, with a temperature rising to around 48 by 5am. Southeast wind 5 to 15 mph. Chance of precipitation is 30%.
Sunday
A chance of showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 68. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 40%.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Southwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 72. Southwest wind 10 to 15 mph.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 57. South wind around 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 72. Chance of precipitation is 60%.
Tuesday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers. Some of the storms could produce heavy rainfall. Low around 55. Chance of precipitation is 80%.
Wednesday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 67.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 48.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Winthrop Harbor IL
 42.49°N 87.81°W (Elev. 600 ft)
Last Update:
9:13 am CDT Apr 10, 2026
Forecast Valid:
10am CDT Apr 10, 2026-6pm CDT Apr 16, 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