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

54°F

12°C

Humidity 53%
Wind Speed SW 10 mph
Barometer 29.94 in (1013.9 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill51°F (11°C)
Last update 16 Feb 9:51 pm CST
Extended Forecast for

Winthrop Harbor IL

  • Tonight

    Tonight: A chance of sprinkles before 2am. Mostly cloudy, with a low around 36. North wind around 5 mph becoming east after midnight.

    Low: 36 °F

    Chance
    Sprinkles

  • Tuesday

    Tuesday: A chance of sprinkles between 1pm and 5pm. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 45. Southeast wind 5 to 15 mph.

    High: 45 °F

    Patchy Fog
    then Cloudy

  • Tuesday Night

    Tuesday Night: Rain. Patchy fog between 9pm and 5am. Low around 42. Southeast wind around 15 mph becoming south after midnight. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 42 °F

    Rain and
    Patchy Fog

  • Wednesday

    Wednesday: A 20 percent chance of rain before noon. Sunny, with a high near 60. Breezy, with a west wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 60 °F

    Breezy.
    Slight Chance
    Rain then
    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 36. West wind 5 to 10 mph.

    Low: 36 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of rain after noon. Partly sunny, with a high near 47. South wind 5 to 10 mph becoming east in the afternoon.

    High: 47 °F

    Partly Sunny
    then Chance
    Rain

  • Thursday Night

    Thursday Night: Rain and possibly a thunderstorm before midnight, then rain likely. Low around 35. East wind 10 to 15 mph becoming southwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 35 °F

    Rain

  • Friday

    Friday: A chance of rain and snow. Partly sunny, with a high near 40. West wind 10 to 15 mph. Chance of precipitation is 40%.

    High: 40 °F

    Chance
    Rain/Snow

  • Friday Night

    Friday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 28.

    Low: 28 °F

    Slight Chance
    Snow then
    Mostly Cloudy

Detailed Forecast

Tonight
A chance of sprinkles before 2am. Mostly cloudy, with a low around 36. North wind around 5 mph becoming east after midnight.
Tuesday
A chance of sprinkles between 1pm and 5pm. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 45. Southeast wind 5 to 15 mph.
Tuesday Night
Rain. Patchy fog between 9pm and 5am. Low around 42. Southeast wind around 15 mph becoming south after midnight. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
A 20 percent chance of rain before noon. Sunny, with a high near 60. Breezy, with a west wind 10 to 20 mph, with gusts as high as 30 mph.
Wednesday Night
Partly cloudy, with a low around 36. West wind 5 to 10 mph.
Thursday
A 30 percent chance of rain after noon. Partly sunny, with a high near 47. South wind 5 to 10 mph becoming east in the afternoon.
Thursday Night
Rain and possibly a thunderstorm before midnight, then rain likely. Low around 35. East wind 10 to 15 mph becoming southwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Friday
A chance of rain and snow. Partly sunny, with a high near 40. West wind 10 to 15 mph. Chance of precipitation is 40%.
Friday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 28.
Saturday
Partly sunny, with a high near 36.
Saturday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 24.
Sunday
A 20 percent chance of snow. Partly sunny, with a high near 33.
Sunday Night
Partly cloudy, with a low around 20.
Monday
Mostly sunny, with a high near 31.
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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:
7:34 pm CST Feb 16, 2026
Forecast Valid:
10pm CST Feb 16, 2026-6pm CST Feb 23, 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