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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Partly Cloudy

72°F

22°C

Humidity 73%
Wind Speed E 6 mph
Barometer 30.02 in (1015.6 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 27 Aug 6:51 pm CDT
Extended Forecast for

Winthrop Harbor IL

  • Tonight

    Tonight: Mostly clear, with a low around 60. East southeast wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 80. Light and variable wind becoming southeast 5 to 10 mph in the morning.

    High: 80 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 63. South southeast wind 5 to 10 mph.

    Low: 63 °F

    Partly Cloudy

  • Saturday

    Saturday: Increasing clouds, with a high near 80. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.

    High: 80 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 10pm. Mostly cloudy, with a low around 68. South wind 10 to 15 mph. Chance of precipitation is 50%.

    Low: 68 °F

    Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 85.

    High: 85 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72.

    Low: 72 °F

    Chance
    T-storms

  • Monday

    Monday: Mostly cloudy, with a high near 86.

    High: 86 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72.

    Low: 72 °F

    Mostly Cloudy
    then Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 60. East southeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 80. Light and variable wind becoming southeast 5 to 10 mph in the morning.
Friday Night
Partly cloudy, with a low around 63. South southeast wind 5 to 10 mph.
Saturday
Increasing clouds, with a high near 80. Southwest wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday Night
A chance of showers, with thunderstorms also possible after 10pm. Mostly cloudy, with a low around 68. South wind 10 to 15 mph. Chance of precipitation is 50%.
Sunday
A 30 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 85.
Sunday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72.
Monday
Mostly cloudy, with a high near 86.
Monday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 72.
Tuesday
A chance of showers before 1pm. Partly sunny, with a high near 85.
Tuesday Night
A chance of showers. Mostly cloudy, with a low around 71.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
A chance of showers. Partly cloudy, with a low around 69.
Thursday
Mostly sunny, with a high near 82.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Winthrop Harbor IL
 42.47°N 87.84°W
Last Update:
2:51 pm CDT Aug 27, 2026
Forecast Valid:
7pm CDT Aug 27, 2026-6pm CDT Sep 3, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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