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

38°F

3°C

Humidity 70%
Wind Speed W 7 mph
Barometer 29.93 in (1013.7 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 16 Feb 1:51 am CST
Extended Forecast for

Winthrop Harbor IL

  • Overnight

    Overnight: Partly cloudy, with a low around 34. Southwest wind around 5 mph.

    Low: 34 °F

    Partly Cloudy

  • Washington's Birthday

    Washington's Birthday: Mostly sunny, with a high near 59. Southwest wind 5 to 15 mph, with gusts as high as 30 mph.

    High: 59 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 35. West wind around 5 mph becoming east after midnight.

    Low: 35 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 46. Southeast wind 5 to 10 mph.

    High: 46 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Rain likely, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 43. Southeast wind around 10 mph becoming south after midnight. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 43 °F

    Chance Rain
    then Rain
    Likely

  • Wednesday

    Wednesday: A 20 percent chance of rain before noon. Partly sunny, then gradually becoming sunny, with a high near 57. West wind 10 to 15 mph, with gusts as high as 30 mph.

    High: 57 °F

    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. Mostly cloudy, then gradually becoming sunny, with a high near 46. West wind 5 to 10 mph becoming east in the morning.

    High: 46 °F

    Mostly Cloudy
    then Chance
    Rain

  • Thursday Night

    Thursday Night: Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 34. Chance of precipitation is 60%.

    Low: 34 °F

    Rain Likely

Detailed Forecast

Overnight
Partly cloudy, with a low around 34. Southwest wind around 5 mph.
Washington's Birthday
Mostly sunny, with a high near 59. Southwest wind 5 to 15 mph, with gusts as high as 30 mph.
Monday Night
Mostly cloudy, with a low around 35. West wind around 5 mph becoming east after midnight.
Tuesday
Mostly cloudy, with a high near 46. Southeast wind 5 to 10 mph.
Tuesday Night
Rain likely, with thunderstorms also possible after 3am. Mostly cloudy, with a low around 43. Southeast wind around 10 mph becoming south after midnight. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Wednesday
A 20 percent chance of rain before noon. Partly sunny, then gradually becoming sunny, with a high near 57. West wind 10 to 15 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. Mostly cloudy, then gradually becoming sunny, with a high near 46. West wind 5 to 10 mph becoming east in the morning.
Thursday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 34. Chance of precipitation is 60%.
Friday
A chance of rain and snow before noon, then a chance of snow. Partly sunny, with a high near 40. Chance of precipitation is 40%.
Friday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 27.
Saturday
Partly sunny, with a high near 36.
Saturday Night
A 20 percent chance of snow. Mostly cloudy, with a low around 22.
Sunday
A 20 percent chance of snow. Partly sunny, with a high near 30.
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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:
1:31 am CST Feb 16, 2026
Forecast Valid:
2am CST Feb 16, 2026-6pm CST Feb 22, 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