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

Lansing Municipal Airport (KIGQ)

Lat: 41.54°NLon: 87.53°WElev: 607ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Chicago Heights IL

Flood Watch September 20, 02:23am until September 20, 01:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch September 20, 02:23am until September 20, 01:00pm

    NOW until 1:00pm Sun

    Flood Watch

  • Overnight

    Low: 68 °F

    Heavy Rain
    and Patchy
    Fog

  • Sunday

    Sunday: Showers and possibly a thunderstorm, mainly before 5pm, then a chance of showers and thunderstorms after 5pm. Patchy fog before 10am. High near 70. North northeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

    High: 70 °F

    Showers and
    Patchy Fog

  • Sunday Night

    Sunday Night: A chance of showers before 7pm, then a chance of showers after 1am. Cloudy, with a low around 57. East northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    Low: 57 °F

    Chance
    Showers

  • Monday

    Monday: A 30 percent chance of showers, mainly before 9am. Mostly 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. Mostly cloudy, with a low around 54. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 63.

    High: 63 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 53.

    Low: 53 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 65.

    High: 65 °F

    Partly Sunny

Detailed Forecast

Overnight
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Patchy fog. Low around 68. East southeast wind around 5 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Sunday
Showers and possibly a thunderstorm, mainly before 5pm, then a chance of showers and thunderstorms after 5pm. Patchy fog before 10am. High near 70. North northeast wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.
Sunday Night
A chance of showers before 7pm, then a chance of showers after 1am. Cloudy, with a low around 57. East northeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Monday
A 30 percent chance of showers, mainly before 9am. Mostly 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. Mostly cloudy, with a low around 54. Northeast wind 10 to 15 mph, with gusts as high as 20 mph.
Tuesday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 63.
Tuesday Night
Partly cloudy, with a low around 53.
Wednesday
Partly sunny, with a high near 65.
Wednesday Night
Mostly cloudy, with a low around 53.
Thursday
Partly sunny, with a high near 66.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
Mostly sunny, with a high near 70.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 72.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Chicago Heights IL
 41.51°N 87.64°W
Last Update:
1:35 am CDT Sep 20, 2026
Forecast Valid:
2am CDT Sep 20, 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