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

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

95°F

35°C

Humidity 46%
Wind Speed E 6 mph
Barometer 30.02 in (1016.1 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index103°F (39°C)
Last update 17 Aug 1:52 pm CDT
Extended Forecast for

Coello IL

Heat Advisory August 17, 02:34pm until August 19, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 17, 02:34pm until August 19, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • This Afternoon

    High: 99 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 75. Light east southeast wind.

    Low: 75 °F

    Partly Cloudy

  • Monday

    Monday: Sunny and hot, with a high near 98. Heat index values as high as 109. Calm wind becoming east southeast around 5 mph in the afternoon.

    High: 98 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 74. East southeast wind around 5 mph becoming calm in the evening.

    Low: 74 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 97. Calm wind becoming west northwest around 6 mph in the afternoon.

    High: 97 °F

    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 73 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 7am. Partly sunny, with a high near 90. Light north wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 30%.

    High: 90 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 68. North northeast wind 6 to 9 mph.

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 99. Heat index values as high as 105. East wind 3 to 5 mph.
Tonight
Partly cloudy, with a low around 75. Light east southeast wind.
Monday
Sunny and hot, with a high near 98. Heat index values as high as 109. Calm wind becoming east southeast around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 74. East southeast wind around 5 mph becoming calm in the evening.
Tuesday
A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 97. Calm wind becoming west northwest around 6 mph in the afternoon.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 73. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Wednesday
A chance of showers, with thunderstorms also possible after 7am. Partly sunny, with a high near 90. Light north wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 30%.
Wednesday Night
Partly cloudy, with a low around 68. North northeast wind 6 to 9 mph.
Thursday
Mostly sunny, with a high near 88. North northeast wind 6 to 10 mph.
Thursday Night
Mostly clear, with a low around 67. North northeast wind 5 to 8 mph becoming calm in the evening.
Friday
Sunny, with a high near 90. North northeast wind 3 to 7 mph.
Friday Night
Mostly clear, with a low around 68. North northeast wind around 6 mph becoming calm in the evening.
Saturday
Sunny, with a high near 91. Calm wind becoming north northwest 5 to 7 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Coello IL
 38.03°N 89.1°W
Last Update:
1:15 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