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

15°F

-9°C

Humidity 88%
Wind Speed SW 3 mph
Barometer 30.25 in (1026.6 mb)
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Last update 23 Feb 10:51 pm CST
Extended Forecast for

Winthrop Harbor IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 16. Light and variable wind becoming south 5 to 10 mph after midnight.

    Low: 16 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Scattered snow showers, mainly after 3pm. Mostly cloudy, with a high near 39. Windy, with a south wind 10 to 15 mph increasing to 20 to 25 mph in the morning. Winds could gust as high as 40 mph. Chance of precipitation is 50%.

    High: 39 °F

    Scattered
    Snow Showers
    and Windy

  • Tuesday Night

    Tuesday Night: Cloudy, then gradually becoming partly cloudy, with a low around 23. West wind around 15 mph.

    Low: 23 °F

    Decreasing
    Clouds

  • Wednesday

    Wednesday: Sunny, with a high near 32. West wind 10 to 15 mph.

    High: 32 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 22. Northwest wind around 5 mph becoming north after midnight.

    Low: 22 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Thursday

    Thursday: Partly sunny, with a high near 39. Northeast wind around 5 mph becoming southwest in the afternoon.

    High: 39 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 29. South wind 5 to 10 mph becoming southwest after midnight.

    Low: 29 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 52. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 52 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a low around 16. Light and variable wind becoming south 5 to 10 mph after midnight.
Tuesday
Scattered snow showers, mainly after 3pm. Mostly cloudy, with a high near 39. Windy, with a south wind 10 to 15 mph increasing to 20 to 25 mph in the morning. Winds could gust as high as 40 mph. Chance of precipitation is 50%.
Tuesday Night
Cloudy, then gradually becoming partly cloudy, with a low around 23. West wind around 15 mph.
Wednesday
Sunny, with a high near 32. West wind 10 to 15 mph.
Wednesday Night
A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 22. Northwest wind around 5 mph becoming north after midnight.
Thursday
Partly sunny, with a high near 39. Northeast wind around 5 mph becoming southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 29. South wind 5 to 10 mph becoming southwest after midnight.
Friday
Mostly sunny, with a high near 52. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night
Partly cloudy, with a low around 31.
Saturday
A 20 percent chance of snow. Partly sunny, with a high near 39.
Saturday Night
Mostly cloudy, with a low around 21.
Sunday
A 30 percent chance of snow. Partly sunny, with a high near 30.
Sunday Night
A 40 percent chance of snow. Mostly cloudy, with a low around 23.
Monday
A 30 percent chance of snow. Partly sunny, with a high near 32.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Winthrop Harbor IL
 42.49°N 87.81°W (Elev. 600 ft)
Last Update:
11:32 pm CST Feb 23, 2026
Forecast Valid:
11pm CST Feb 23, 2026-6pm CST Mar 2, 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