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

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

79°F

26°C

Humidity 50%
Wind Speed N 8 mph
Barometer 30.03 in (1016.6 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 19 Jun 10:52 am CDT
Extended Forecast for

Coello IL

  • Juneteenth

    Juneteenth: Sunny, with a high near 85. Light north northwest wind.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 88. Light west wind.

    High: 88 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 67. Calm wind.

    Low: 67 °F

    Increasing
    Clouds

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 86. Light and variable wind becoming south southwest 12 to 17 mph in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 80%.

    High: 86 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 69. South southwest wind 13 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.

    Low: 69 °F

    Showers

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 81. Northwest wind 10 to 13 mph.

    High: 81 °F

    Chance
    T-storms then
    Chance
    Showers

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. North wind 5 to 10 mph becoming light in the evening.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. Northeast wind around 5 mph becoming calm in the afternoon.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

Juneteenth
Sunny, with a high near 85. Light north northwest wind.
Tonight
Mostly cloudy, with a low around 64. Calm wind.
Saturday
Mostly sunny, with a high near 88. Light west wind.
Saturday Night
Increasing clouds, with a low around 67. Calm wind.
Sunday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 86. Light and variable wind becoming south southwest 12 to 17 mph in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 80%.
Sunday Night
Showers and possibly a thunderstorm. Low around 69. South southwest wind 13 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.
Monday
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 81. Northwest wind 10 to 13 mph.
Monday Night
Partly cloudy, with a low around 63. North wind 5 to 10 mph becoming light in the evening.
Tuesday
Mostly sunny, with a high near 82. Northeast wind around 5 mph becoming calm in the afternoon.
Tuesday Night
Partly cloudy, with a low around 63. Light northeast wind.
Wednesday
Mostly sunny, with a high near 84. Calm wind becoming west northwest around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 63. Light west northwest wind.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. Calm wind becoming west around 6 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Coello IL
 38.03°N 89.1°W
Last Update:
11:11 am CDT Jun 19, 2026
Forecast Valid:
11am CDT Jun 19, 2026-6pm CDT Jun 25, 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