National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

A Few Clouds

64°F

18°C

Humidity 81%
Wind Speed NE 3 mph
Barometer 29.97 in (1014.1 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 19 Aug 10:51 pm CDT
Extended Forecast for

Winthrop Harbor IL

  • Tonight

    Tonight: Mostly clear, with a low around 63. Northeast wind around 5 mph becoming calm after midnight.

    Low: 63 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 75. Calm wind becoming east around 5 mph in the morning.

    High: 75 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 60. Southeast wind around 5 mph becoming southwest after midnight.

    Low: 60 °F

    Partly Cloudy

  • Friday

    Friday: Showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 80. Southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%.

    High: 80 °F

    Partly Sunny
    then Showers
    Likely

  • Friday Night

    Friday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 62. Southwest wind around 5 mph becoming west northwest after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 20%.

    Low: 62 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 79.

    High: 79 °F

    Sunny then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 60.

    Low: 60 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 63. Northeast wind around 5 mph becoming calm after midnight.
Thursday
Sunny, with a high near 75. Calm wind becoming east around 5 mph in the morning.
Thursday Night
Partly cloudy, with a low around 60. Southeast wind around 5 mph becoming southwest after midnight.
Friday
Showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 80. Southwest wind 5 to 10 mph, with gusts as high as 15 mph. Chance of precipitation is 60%.
Friday Night
A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 62. Southwest wind around 5 mph becoming west northwest after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 20%.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 79.
Saturday Night
Mostly clear, with a low around 60.
Sunday
Mostly sunny, with a high near 75.
Sunday Night
Partly cloudy, with a low around 59.
Monday
Mostly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 61.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
Partly cloudy, with a low around 63.
Wednesday
Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Winthrop Harbor IL
 42.47°N 87.84°W
Last Update:
10:01 pm CDT Aug 19, 2026
Forecast Valid:
11pm CDT Aug 19, 2026-6pm CDT Aug 26, 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