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

47°F

8°C

Humidity 61%
Wind Speed Vrbl 5 mph
Barometer 30.10 in (1020.0 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 19 Mar 11:51 am CDT
Extended Forecast for

Winthrop Harbor IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 45. East wind around 5 mph.

    High: 45 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 36. East wind 5 to 10 mph becoming southwest after midnight.

    Low: 36 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 53. Southwest wind around 10 mph becoming north in the afternoon.

    High: 53 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 36. North wind around 5 mph becoming calm in the evening.

    Low: 36 °F

    Mostly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: Mostly sunny, with a high near 58. South wind 5 to 10 mph.

    High: 58 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 42. South wind 5 to 10 mph.

    Low: 42 °F

    Partly Cloudy

  • Sunday

    Sunday: A 20 percent chance of rain before 1pm. Mostly cloudy, with a high near 48. North wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 48 °F

    Slight Chance
    Rain

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 30. North wind around 15 mph.

    Low: 30 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 39.

    High: 39 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 45. East wind around 5 mph.
Tonight
Mostly cloudy, with a low around 36. East wind 5 to 10 mph becoming southwest after midnight.
Friday
Mostly cloudy, with a high near 53. Southwest wind around 10 mph becoming north in the afternoon.
Friday Night
Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 36. North wind around 5 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 58. South wind 5 to 10 mph.
Saturday Night
Partly cloudy, with a low around 42. South wind 5 to 10 mph.
Sunday
A 20 percent chance of rain before 1pm. Mostly cloudy, with a high near 48. North wind 10 to 15 mph, with gusts as high as 25 mph.
Sunday Night
Mostly cloudy, with a low around 30. North wind around 15 mph.
Monday
Mostly sunny, with a high near 39.
Monday Night
Mostly cloudy, with a low around 31.
Tuesday
Mostly cloudy, with a high near 48.
Tuesday Night
Mostly cloudy, with a low around 34.
Wednesday
Mostly cloudy, with a high near 50.
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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:
11:47 am CDT Mar 19, 2026
Forecast Valid:
12pm CDT Mar 19, 2026-6pm CDT Mar 25, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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