National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Marshall County Airport (KC75)

Lat: 41.02°NLon: 89.39°WElev: 545ft.

Fair

76°F

24°C

Humidity 85%
Wind Speed Calm
Barometer 29.93 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index77°F (25°C)
Last update 2 Sep 11:35 pm CDT
Extended Forecast for

Chillicothe IL

Extreme Heat Warning until September 4, 07:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning until September 4, 07:00pm

    NOW until 7:00pm Fri

    Extreme Heat Warning

  • Tonight

    Low: 77 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 94. Heat index values as high as 103. Southwest wind 3 to 7 mph.

    High: 94 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 76. Light south wind.

    Low: 76 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 93. Heat index values as high as 102. Light south southwest wind.

    High: 93 °F

    Sunny

  • Friday Night

    Friday Night: A 40 percent chance of showers after 1am. Mostly clear, with a low around 74. Calm wind.

    Low: 74 °F

    Mostly Clear
    then Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 90. Calm wind.

    High: 90 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 71. Light east wind.

    Low: 71 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 77. South southwest wind around 6 mph.
Thursday
A 20 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 94. Heat index values as high as 103. Southwest wind 3 to 7 mph.
Thursday Night
A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 76. Light south wind.
Friday
Sunny, with a high near 93. Heat index values as high as 102. Light south southwest wind.
Friday Night
A 40 percent chance of showers after 1am. Mostly clear, with a low around 74. Calm wind.
Saturday
Mostly sunny, with a high near 90. Calm wind.
Saturday Night
Mostly clear, with a low around 71. Light east wind.
Sunday
Mostly sunny, with a high near 87.
Sunday Night
Mostly clear, with a low around 69.
Labor Day
Mostly sunny, with a high near 86.
Monday Night
Partly cloudy, with a low around 68.
Tuesday
Mostly sunny, with a high near 87.
Tuesday Night
Partly cloudy, with a low around 72.
Wednesday
Mostly sunny, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Chillicothe IL
 40.91°N 89.49°W (Elev. 472 ft)
Last Update:
10:36 pm CDT Sep 2, 2026
Forecast Valid:
11pm CDT Sep 2, 2026-6pm CDT Sep 9, 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