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-O'Hare International Airport (KORD)

Lat: 41.98°NLon: 87.9°WElev: 666ft.

Light Rain

69°F

21°C

Humidity 63%
Wind Speed E 13 mph
Barometer 30.26 in (1024.2 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 18 Sep 12:51 pm CDT
Extended Forecast for

Oak Brook IL

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

  • This Afternoon

    This Afternoon: Isolated showers. Mostly cloudy, with a high near 72. East northeast wind 10 to 15 mph. Chance of precipitation is 20%.

    High: 72 °F

    Isolated
    Showers

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 63. East southeast wind 10 to 15 mph.

    Low: 63 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms, mainly before noon. High near 77. East southeast wind 10 to 15 mph becoming south in the afternoon. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

    High: 77 °F

    T-storms then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 10pm. Low around 65. East southeast wind 5 to 10 mph becoming north northwest in the evening. Chance of precipitation is 80%.

    Low: 65 °F

    T-storms

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Cloudy, with a high near 69. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.

    High: 69 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 57.

    Low: 57 °F

    Chance
    Showers

  • Monday

    Monday: A 50 percent chance of showers. Cloudy, with a high near 64.

    High: 64 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 63.

    High: 63 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Isolated showers. Mostly cloudy, with a high near 72. East northeast wind 10 to 15 mph. Chance of precipitation is 20%.
Tonight
A 40 percent chance of showers and thunderstorms, mainly after 2am. Mostly cloudy, with a low around 63. East southeast wind 10 to 15 mph.
Saturday
Showers and thunderstorms, mainly before noon. High near 77. East southeast wind 10 to 15 mph becoming south in the afternoon. Chance of precipitation is 80%. 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. East southeast wind 5 to 10 mph becoming north northwest in the evening. Chance of precipitation is 80%.
Sunday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 69. Northeast wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 57.
Monday
A 50 percent chance of showers. Cloudy, with a high near 64.
Monday Night
Mostly cloudy, with a low around 54.
Tuesday
Mostly cloudy, with a high near 63.
Tuesday Night
Mostly cloudy, with a low around 54.
Wednesday
Mostly cloudy, with a high near 65.
Wednesday Night
Mostly cloudy, with a low around 54.
Thursday
Partly sunny, with a high near 68.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Oak Brook IL
 41.85°N 87.94°W
Last Update:
1:51 pm CDT Sep 18, 2026
Forecast Valid:
1pm CDT Sep 18, 2026-6pm CDT Sep 24, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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