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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Chicago/Waukegan Regional Airport (KUGN)

Lat: 42.43°NLon: 87.86°WElev: 709ft.

Fair

66°F

19°C

Humidity 84%
Wind Speed E 8 mph
Barometer 30.28 in (1024.7 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 18 Sep 7:51 am CDT
Extended Forecast for

2 Miles NE Winthrop Harbor IL

  • Today

    Today: Partly sunny, with a high near 69. East wind 10 to 15 mph.

    High: 69 °F

    Partly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Some of the storms could produce heavy rainfall. Low around 60. Southeast wind 10 to 15 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 60 °F

    Chance
    Showers then
    Heavy Rain

  • Saturday

    Saturday: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Some of the storms could produce heavy rainfall. High near 70. Southeast wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    High: 70 °F

    Heavy Rain

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 58. Northeast wind around 10 mph. Chance of precipitation is 80%. New precipitation amounts between three quarters and one inch possible.

    Low: 58 °F

    Showers

  • Sunday

    Sunday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 67. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 67 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 40 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 53. East wind around 15 mph, with gusts as high as 25 mph.

    Low: 53 °F

    Chance
    Showers

  • Monday

    Monday: A 50 percent chance of showers. Cloudy, with a high near 65. Breezy, with an east wind 15 to 20 mph, with gusts as high as 35 mph.

    High: 65 °F

    Chance
    Showers and
    Breezy

  • Monday Night

    Monday Night: A 20 percent chance of showers. Cloudy, with a low around 53. Breezy, with a northeast wind 15 to 20 mph, with gusts as high as 30 mph.

    Low: 53 °F

    Slight Chance
    Showers and
    Breezy

  • Tuesday

    Tuesday: A 20 percent chance of showers. Mostly cloudy, with a high near 61.

    High: 61 °F

    Slight Chance
    Showers

Detailed Forecast

Today
Partly sunny, with a high near 69. East wind 10 to 15 mph.
Tonight
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Some of the storms could produce heavy rainfall. Low around 60. Southeast wind 10 to 15 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Saturday
Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Some of the storms could produce heavy rainfall. High near 70. Southeast wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Saturday Night
Showers and possibly a thunderstorm. Low around 58. Northeast wind around 10 mph. Chance of precipitation is 80%. New precipitation amounts between three quarters and one inch possible.
Sunday
Showers likely, mainly before 1pm. Mostly cloudy, with a high near 67. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 60%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
A 40 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 53. East wind around 15 mph, with gusts as high as 25 mph.
Monday
A 50 percent chance of showers. Cloudy, with a high near 65. Breezy, with an east wind 15 to 20 mph, with gusts as high as 35 mph.
Monday Night
A 20 percent chance of showers. Cloudy, with a low around 53. Breezy, with a northeast wind 15 to 20 mph, with gusts as high as 30 mph.
Tuesday
A 20 percent chance of showers. Mostly cloudy, with a high near 61.
Tuesday Night
Mostly cloudy, with a low around 52.
Wednesday
Partly sunny, with a high near 62.
Wednesday Night
Mostly cloudy, with a low around 52.
Thursday
Partly sunny, with a high near 64.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NE Winthrop Harbor IL
 42.49°N 87.81°W (Elev. 600 ft)
Last Update:
6:41 am CDT Sep 18, 2026
Forecast Valid:
8am CDT Sep 18, 2026-6pm CDT Sep 24, 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