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, Chicago Midway Airport (KMDW)

Lat: 41.78°NLon: 87.76°WElev: 617ft.

Overcast

71°F

22°C

Humidity 90%
Wind Speed SE 3 mph
Barometer 29.92 in (1012.6 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 19 Sep 5:53 pm CDT
Extended Forecast for

Westchester IL

Flood Watch September 19, 06:26pm until September 20, 07:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch September 19, 06:26pm until September 20, 07:00am

    NOW until 7:00am Sun

    Flood Watch

  • Tonight

    Low: 69 °F

    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm before 1pm, then showers likely. Temperature falling to around 64 by 5pm. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 67 °F⇓

    Showers

  • Sunday Night

    Sunday Night: A chance of showers before 8pm, then a slight chance of showers after 1am. Mostly cloudy, with a low around 58. East northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    Low: 58 °F

    Chance
    Showers

  • Monday

    Monday: A 40 percent chance of showers. Cloudy, with a high near 65. East northeast wind around 15 mph, with gusts as high as 25 mph.

    High: 65 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Cloudy, with a low around 56. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Cloudy then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 63.

    High: 63 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Steady temperature around 69. East wind around 5 mph becoming west northwest after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Sunday
Showers and possibly a thunderstorm before 1pm, then showers likely. Temperature falling to around 64 by 5pm. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A chance of showers before 8pm, then a slight chance of showers after 1am. Mostly cloudy, with a low around 58. East northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Monday
A 40 percent chance of showers. Cloudy, with a high near 65. East northeast wind around 15 mph, with gusts as high as 25 mph.
Monday Night
A 20 percent chance of showers after 1am. Cloudy, with a low around 56. East northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
A 30 percent chance of showers, mainly before 1pm. Mostly cloudy, with a high near 63.
Tuesday Night
Mostly cloudy, with a low around 55.
Wednesday
Mostly cloudy, with a high near 64.
Wednesday Night
Mostly cloudy, with a low around 56.
Thursday
Partly sunny, with a high near 67.
Thursday Night
Mostly cloudy, with a low around 56.
Friday
Partly sunny, with a high near 71.
Friday Night
Partly cloudy, with a low around 57.
Saturday
Mostly sunny, with a high near 73.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Westchester IL
 41.84°N 87.88°W
Last Update:
4:01 pm CDT Sep 19, 2026
Forecast Valid:
6pm CDT Sep 19, 2026-6pm CDT Sep 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