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

67°F

19°C

Humidity 93%
Wind Speed W 5 mph
Barometer 29.98 in (1014.7 mb)
Dewpoint 65°F (18°C)
Visibility 7.00 mi
Last update 19 Sep 12:53 pm CDT
Extended Forecast for

Chicago IL

Flood Watch September 19, 01:26pm until September 20, 07:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch September 19, 01:26pm until September 20, 07:00am

    NOW until 7:00am Sun

    Flood Watch

  • This Afternoon

    High: 70 °F

    Chance
    Showers

  • Tonight

    Tonight: Showers and possibly a thunderstorm. Steady temperature around 68. East wind around 5 mph becoming west after midnight. Winds could gust as high as 10 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

    Low: 68 °F

    Showers
    Likely then
    Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm before 1pm, then a chance of showers. Temperature falling to around 64 by 4pm. Breezy, with a northeast wind 10 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 68 °F⇓

    Showers and
    Breezy

  • Sunday Night

    Sunday Night: A 20 percent chance of showers before 8pm. Mostly cloudy, with a low around 58. East northeast wind around 15 mph, with gusts as high as 25 mph.

    Low: 58 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • 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 55.

    Low: 55 °F

    Cloudy then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers. Mostly cloudy, with a high near 64.

    High: 64 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 56.

    Low: 56 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
A 50 percent chance of showers and thunderstorms. Cloudy, with a high near 70. East northeast wind around 5 mph, with gusts as high as 10 mph.
Tonight
Showers and possibly a thunderstorm. Steady temperature around 68. East wind around 5 mph becoming west 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 a chance of showers. Temperature falling to around 64 by 4pm. Breezy, with a northeast wind 10 to 20 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A 20 percent chance of showers before 8pm. Mostly cloudy, with a low around 58. East northeast wind around 15 mph, with gusts as high as 25 mph.
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 55.
Tuesday
A 20 percent chance of showers. Mostly cloudy, with a high near 64.
Tuesday Night
Mostly cloudy, with a low around 56.
Wednesday
Mostly cloudy, with a high near 64.
Wednesday Night
Mostly cloudy, with a low around 56.
Thursday
Partly sunny, with a high near 66.
Thursday Night
Mostly cloudy, with a low around 57.
Friday
Partly sunny, with a high near 69.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Chicago IL
 41.84°N 87.68°W
Last Update:
1:21 pm CDT Sep 19, 2026
Forecast Valid:
1pm CDT Sep 19, 2026-6pm CDT Sep 25, 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