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

Risks of Severe Thunderstorms and Excessive Rainfall; Fire Weather Concerns and Record Warmth

Severe thunderstorms and flash flooding risks increase across the center of the nation today. Meanwhile, ongoing thunderstorms and flash flooding will linger along the Gulf Coast states through the evening. The Great Basin and Intermountain West, warm temperatures and dry fuels with dry lightning may enhance fire weather potential. In addition, across interior Alaska, Red Flag Warning are posted. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

61°F

16°C

Humidity 78%
Wind Speed Calm
Barometer 29.92 in (1012.7 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 20 Jun 8:51 pm CDT
Extended Forecast for

Winthrop Harbor IL

  • Tonight

    Tonight: Partly cloudy, with a low around 55. South wind around 5 mph becoming west northwest after midnight.

    Low: 55 °F

    Partly Cloudy

  • Sunday

    Sunday: Showers, mainly after 3pm. High near 65. North northeast wind 5 to 10 mph becoming east southeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 65 °F

    Partly Sunny
    then Showers

  • Sunday Night

    Sunday Night: Showers, mainly before 1am. Low around 56. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 56 °F

    Showers

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 67. North northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 67 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 53. North wind 5 to 15 mph.

    Low: 53 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 56.

    Low: 56 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 74.

    High: 74 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 55. South wind around 5 mph becoming west northwest after midnight.
Sunday
Showers, mainly after 3pm. High near 65. North northeast wind 5 to 10 mph becoming east southeast in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
Showers, mainly before 1am. Low around 56. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 67. North northeast wind around 15 mph, with gusts as high as 25 mph.
Monday Night
Mostly clear, with a low around 53. North wind 5 to 15 mph.
Tuesday
Mostly sunny, with a high near 68.
Tuesday Night
A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 56.
Wednesday
Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 74.
Wednesday Night
Partly cloudy, with a low around 55.
Thursday
A chance of showers after 1pm. Mostly sunny, with a high near 72.
Thursday Night
Partly cloudy, with a low around 56.
Friday
Mostly sunny, with a high near 75.
Friday Night
Partly cloudy, with a low around 58.
Saturday
Mostly sunny, with a high near 79.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Winthrop Harbor IL
 42.47°N 87.84°W
Last Update:
8:31 pm CDT Jun 20, 2026
Forecast Valid:
9pm CDT Jun 20, 2026-6pm CDT Jun 27, 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