National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Rapid Warm-Up Forecast Across Much of the Lower 48 Today and Tuesday

Most of the U.S. starts the week calm and unseasonably warm. The Heartland will be warmest, with highs 25–30° above average. Only the Gulf Coast stays chilly. Rain today is limited to western Washington while lake effect snow continues east of Lake Ontario. Cooler air returns after Tuesday, bringing a wintry mix to the Midwest and Northeast by Wednesday. Read More >

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

36°F

2°C

Humidity 79%
Wind Speed SW 14 mph
Barometer 30.01 in (1017.3 mb)
Dewpoint 30°F (-1°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 12 Jan 6:51 pm CST
Extended Forecast for

Winthrop Harbor IL

  • Tonight

    Tonight: Increasing clouds, with a low around 35. Southwest wind 10 to 15 mph.

    Low: 35 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, with a high near 46. West wind around 15 mph, with gusts as high as 25 mph.

    High: 46 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 22. West wind 10 to 15 mph.

    Low: 22 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of snow. Mostly cloudy, with a high near 32. Breezy, with a north wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 32 °F

    Chance Snow
    and Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 13. Blustery, with a north wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 13 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 25. Northwest wind 10 to 15 mph becoming southwest in the afternoon.

    High: 25 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 21. Southwest wind around 10 mph.

    Low: 21 °F

    Chance Snow

  • Friday

    Friday: Snow likely. Cloudy, with a high near 32. West wind around 10 mph. Chance of precipitation is 70%.

    High: 32 °F

    Snow Likely

  • Friday Night

    Friday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 16.

    Low: 16 °F

    Chance Snow

Detailed Forecast

Tonight
Increasing clouds, with a low around 35. Southwest wind 10 to 15 mph.
Tuesday
Partly sunny, with a high near 46. West wind around 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 22. West wind 10 to 15 mph.
Wednesday
A 50 percent chance of snow. Mostly cloudy, with a high near 32. Breezy, with a north wind 15 to 20 mph, with gusts as high as 30 mph.
Wednesday Night
Partly cloudy, with a low around 13. Blustery, with a north wind 15 to 20 mph, with gusts as high as 30 mph.
Thursday
Mostly sunny, with a high near 25. Northwest wind 10 to 15 mph becoming southwest in the afternoon.
Thursday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 21. Southwest wind around 10 mph.
Friday
Snow likely. Cloudy, with a high near 32. West wind around 10 mph. Chance of precipitation is 70%.
Friday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 16.
Saturday
A 50 percent chance of snow. Mostly cloudy, with a high near 21.
Saturday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 8.
Sunday
A 20 percent chance of snow. Mostly cloudy, with a high near 18.
Sunday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 7.
M.L.King Day
A 20 percent chance of snow. Partly sunny, with a high near 19.
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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:
3:13 pm CST Jan 12, 2026
Forecast Valid:
7pm CST Jan 12, 2026-6pm CST Jan 19, 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