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

42°F

6°C

Humidity 79%
Wind Speed W 10 mph
Barometer 29.87 in (1011.5 mb)
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Wind Chill36°F (2°C)
Last update 7 Mar 6:51 pm CST
Extended Forecast for

Winthrop Harbor IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 36. West wind 10 to 15 mph.

    Low: 36 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 58. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.

    High: 58 °F

    Sunny and
    Breezy then
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 46. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.

    Low: 46 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 62. Southwest wind 5 to 15 mph.

    High: 62 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 43. South wind 5 to 10 mph becoming north in the evening.

    Low: 43 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 50 percent chance of rain and thunderstorms after noon. Increasing clouds, with a high near 54. Northeast wind around 10 mph.

    High: 54 °F

    Mostly Sunny
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 38. North wind 10 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 38 °F

    Rain

  • Wednesday

    Wednesday: Rain before noon, then a chance of rain and snow. High near 43. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 43 °F

    Rain then
    Chance
    Rain/Snow

  • Wednesday Night

    Wednesday Night: A 30 percent chance of snow before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 28.

    Low: 28 °F

    Chance Snow
    then Partly
    Cloudy

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 36. West wind 10 to 15 mph.
Sunday
Sunny, with a high near 58. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 30 mph.
Sunday Night
Mostly clear, with a low around 46. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Monday
Sunny, with a high near 62. Southwest wind 5 to 15 mph.
Monday Night
Mostly clear, with a low around 43. South wind 5 to 10 mph becoming north in the evening.
Tuesday
A 50 percent chance of rain and thunderstorms after noon. Increasing clouds, with a high near 54. Northeast wind around 10 mph.
Tuesday Night
Rain and possibly a thunderstorm. Low around 38. North wind 10 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Wednesday
Rain before noon, then a chance of rain and snow. High near 43. Northwest wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday Night
A 30 percent chance of snow before midnight. Cloudy, then gradually becoming partly cloudy, with a low around 28.
Thursday
Partly sunny, with a high near 41.
Thursday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 35.
Friday
A 30 percent chance of rain. Mostly cloudy, with a high near 52.
Friday Night
Partly cloudy, with a low around 30.
Saturday
A 30 percent chance of snow. Mostly cloudy, with a high near 39.
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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:
6:02 pm CST Mar 7, 2026
Forecast Valid:
7pm CST Mar 7, 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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation