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.

Mostly Cloudy

70°F

21°C

Humidity 64%
Wind Speed E 12 mph
Barometer 30.13 in (1019.5 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 18 Sep 8:53 pm CDT
Extended Forecast for

Chicago IL

Flood Watch September 19, 04:00am until September 19, 01:00pm
Click here for hazard details and duration
Flood Watch

  • Tonight

    Tonight: A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62. East southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

    Low: 62 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms, mainly before 1pm. High near 76. South wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    High: 76 °F

    T-storms then
    T-storms
    Likely

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm. Low around 65. Southeast wind around 5 mph becoming northwest in the evening. Winds could gust as high as 10 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

    Low: 65 °F

    T-storms

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 68. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%.

    High: 68 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 57. East northeast wind around 15 mph, with gusts as high as 30 mph.

    Low: 57 °F

    Chance
    Showers

  • Monday

    Monday: A 50 percent chance of showers. Cloudy, with a high near 66.

    High: 66 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 55.

    Low: 55 °F

    Cloudy then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

  • Tuesday Night

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

    Low: 55 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 62. East southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.
Saturday
Showers and thunderstorms, mainly before 1pm. High near 76. South wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Saturday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm. Low around 65. Southeast wind around 5 mph becoming northwest in the evening. Winds could gust as high as 10 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 68. Northeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 70%.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 57. East northeast wind around 15 mph, with gusts as high as 30 mph.
Monday
A 50 percent chance of showers. Cloudy, with a high near 66.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 55.
Tuesday
Mostly cloudy, with a high near 64.
Tuesday Night
Mostly cloudy, with a low around 55.
Wednesday
Partly sunny, with a high near 65.
Wednesday Night
Mostly cloudy, with a low around 56.
Thursday
Partly sunny, with a high near 68.
Thursday Night
Mostly cloudy, with a low around 57.
Friday
Mostly sunny, with a high near 70.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Chicago IL
 41.84°N 87.68°W
Last Update:
9:51 pm CDT Sep 18, 2026
Forecast Valid:
10pm CDT Sep 18, 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