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

87°F

31°C

Humidity 65%
Wind Speed SW 5 mph
Barometer 30.03 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 17 Aug 2:15 pm CDT
Extended Forecast for

Chillicothe IL

Heat Advisory August 17, 02:33pm until August 17, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 17, 02:33pm until August 17, 08:00pm

    NOW until 8:00pm Sun

    Heat Advisory

  • This Afternoon

    High: 90 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 11pm. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 72. East wind around 7 mph.

    Low: 72 °F

    Slight Chance
    T-storms then
    Patchy Fog

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms. Patchy fog before 8am. Otherwise, partly sunny, with a high near 90. Heat index values as high as 101. South wind 7 to 9 mph, with gusts as high as 15 mph.

    High: 90 °F

    Slight Chance
    T-storms and
    Patchy Fog

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. Light south wind.

    Low: 74 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Mostly sunny, with a high near 88. Light and variable wind becoming west around 6 mph in the morning. Chance of precipitation is 40%.

    High: 88 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 69. North northeast wind 3 to 5 mph.

    Low: 69 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 82. North northeast wind 5 to 8 mph, with gusts as high as 15 mph.

    High: 82 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 64.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 90. Light east southeast wind.
Tonight
A 20 percent chance of showers and thunderstorms before 11pm. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 72. East wind around 7 mph.
Monday
A 20 percent chance of showers and thunderstorms. Patchy fog before 8am. Otherwise, partly sunny, with a high near 90. Heat index values as high as 101. South wind 7 to 9 mph, with gusts as high as 15 mph.
Monday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. Light south wind.
Tuesday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm. Mostly sunny, with a high near 88. Light and variable wind becoming west around 6 mph in the morning. Chance of precipitation is 40%.
Tuesday Night
Partly cloudy, with a low around 69. North northeast wind 3 to 5 mph.
Wednesday
Mostly sunny, with a high near 82. North northeast wind 5 to 8 mph, with gusts as high as 15 mph.
Wednesday Night
Mostly clear, with a low around 64.
Thursday
Sunny, with a high near 83.
Thursday Night
Mostly clear, with a low around 63.
Friday
Sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 66.
Saturday
Mostly sunny, with a high near 82.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Chillicothe IL
 40.91°N 89.49°W (Elev. 472 ft)
Last Update:
2:25 pm CDT Aug 17, 2025
Forecast Valid:
2pm CDT Aug 17, 2025-6pm CDT Aug 23, 2025
 
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