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

32°F

0°C

Humidity 88%
Wind Speed SW 13 mph
Barometer 29.88 in (1012.5 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill22°F (-6°C)
Last update 8 Mar 4:51 am CDT
Extended Forecast for

Winthrop Harbor IL

  • Today

    Today: Mostly sunny, with a high near 59. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 59 °F

    Mostly Sunny
    and Breezy

  • Tonight

    Tonight: Partly cloudy, with a low around 46. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.

    Low: 46 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 66. Southwest wind 10 to 15 mph.

    High: 66 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 44. South wind around 5 mph becoming northwest after midnight.

    Low: 44 °F

    Mostly Clear

  • Tuesday

    Tuesday: Rain likely and possibly a thunderstorm, mainly after 4pm. Mostly sunny, with a high near 45. Northeast wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 45 °F

    Mostly Sunny
    then Rain
    Likely

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Steady temperature around 44. North wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    Low: 44 °F

    Rain

  • Wednesday

    Wednesday: Rain before 1pm, then snow likely, possibly mixed with rain. High near 43. Northwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 43 °F

    Rain then
    Rain/Snow

  • Wednesday Night

    Wednesday Night: A 30 percent chance of snow before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 26. Northwest wind around 15 mph, with gusts as high as 25 mph.

    Low: 26 °F

    Chance Snow

  • Thursday

    Thursday: Increasing clouds, with a high near 42.

    High: 42 °F

    Increasing
    Clouds

Detailed Forecast

Today
Mostly sunny, with a high near 59. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Tonight
Partly cloudy, with a low around 46. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.
Monday
Sunny, with a high near 66. Southwest wind 10 to 15 mph.
Monday Night
Mostly clear, with a low around 44. South wind around 5 mph becoming northwest after midnight.
Tuesday
Rain likely and possibly a thunderstorm, mainly after 4pm. Mostly sunny, with a high near 45. Northeast wind 5 to 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 Night
Rain and possibly a thunderstorm. Steady temperature around 44. North wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Wednesday
Rain before 1pm, then snow likely, possibly mixed with rain. High near 43. Northwest wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday Night
A 30 percent chance of snow before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 26. Northwest wind around 15 mph, with gusts as high as 25 mph.
Thursday
Increasing clouds, with a high near 42.
Thursday Night
A chance of rain and snow before 1am, then a chance of rain. Mostly cloudy, with a low around 35. Chance of precipitation is 50%.
Friday
A 20 percent chance of rain. Mostly cloudy, with a high near 48.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 28.
Saturday
A 30 percent chance of snow. Mostly cloudy, with a high near 39.
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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:
4:16 am CDT Mar 8, 2026
Forecast Valid:
5am CDT Mar 8, 2026-6pm CDT Mar 14, 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