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

Storm Impacting the Southwest U.S.; Above Normal Temperatures Further East

A storm system will shift across the southwest U.S. through Thursday with widespread showers and isolated thunderstorms. Isolated flooding is possible. High-elevation snow is also expected in parts of Nevada and the southern Sierra Nevada range. East of this storm, above average temperatures will challenge or break daily record high temperatures this week in the southern Plains and southeast U.S. Read More >

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Light Rain Fog/Mist

40°F

4°C

Humidity 100%
Wind Speed E 9 G 20 mph
Barometer 29.98 in (1015.8 mb)
Dewpoint 40°F (4°C)
Visibility 2.50 mi
Wind Chill34°F (1°C)
Last update 18 Nov 12:51 pm CST
Extended Forecast for

Winthrop Harbor IL

  • This Afternoon

    This Afternoon: A 40 percent chance of rain, mainly before 4pm. Cloudy, with a high near 42. East wind around 15 mph, with gusts as high as 20 mph.

    High: 42 °F

    Chance Rain

  • Tonight

    Tonight: A slight chance of drizzle before 9pm. Cloudy, with a low around 39. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 39 °F

    Slight Chance
    Drizzle then
    Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 43. East northeast wind 5 to 10 mph becoming southeast in the afternoon.

    High: 43 °F

    Mostly Cloudy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 41. Southeast wind around 5 mph becoming calm.

    Low: 41 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 20 percent chance of rain after noon. Mostly cloudy, with a high near 53. South southwest wind 5 to 10 mph.

    High: 53 °F

    Partly Sunny
    then Slight
    Chance Rain

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 47.

    High: 47 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 40 percent chance of rain, mainly before 4pm. Cloudy, with a high near 42. East wind around 15 mph, with gusts as high as 20 mph.
Tonight
A slight chance of drizzle before 9pm. Cloudy, with a low around 39. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Wednesday
Mostly cloudy, with a high near 43. East northeast wind 5 to 10 mph becoming southeast in the afternoon.
Wednesday Night
Mostly cloudy, with a low around 41. Southeast wind around 5 mph becoming calm.
Thursday
A 20 percent chance of rain after noon. Mostly cloudy, with a high near 53. South southwest wind 5 to 10 mph.
Thursday Night
Mostly cloudy, with a low around 37.
Friday
Mostly sunny, with a high near 47.
Friday Night
Partly cloudy, with a low around 33.
Saturday
Mostly sunny, with a high near 48.
Saturday Night
Partly cloudy, with a low around 38.
Sunday
Mostly sunny, with a high near 51.
Sunday Night
Partly cloudy, with a low around 40.
Monday
Mostly sunny, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Winthrop Harbor IL
 42.47°N 87.81°W
Last Update:
7:56 am CST Nov 18, 2025
Forecast Valid:
1pm CST Nov 18, 2025-6pm CST Nov 24, 2025
 
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