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.

A Few Clouds

93°F

34°C

Humidity 39%
Wind Speed SW 10 mph
Barometer 29.86 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 20 Sep 2:57 pm CDT
Extended Forecast for

Carbondale IL

Heat Advisory September 20, 04:44pm until September 20, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 20, 04:44pm until September 20, 07:00pm

    NOW until 7:00pm Sun

    Heat Advisory

  • This Afternoon

    High: 96 °F

    Mostly Sunny

  • Tonight

    Tonight: A slight chance of showers and thunderstorms between 1am and 3am. Partly cloudy, with a low around 70. Light and variable wind. Chance of precipitation is 20%.

    Low: 70 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Partly sunny, with a high near 86. North wind 3 to 7 mph.

    High: 86 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms, mainly between 1am and 2am. Mostly cloudy, with a low around 63. North northeast wind 3 to 7 mph.

    Low: 63 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: Partly sunny, with a high near 78. North northeast wind 6 to 9 mph.

    High: 78 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 57. North wind 5 to 9 mph.

    Low: 57 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 76. North wind 6 to 9 mph.

    High: 76 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 55. North northeast wind 5 to 8 mph becoming calm in the evening.

    Low: 55 °F

    Mostly Clear

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 96. West southwest wind around 6 mph.
Tonight
A slight chance of showers and thunderstorms between 1am and 3am. Partly cloudy, with a low around 70. Light and variable wind. Chance of precipitation is 20%.
Monday
A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Partly sunny, with a high near 86. North wind 3 to 7 mph.
Monday Night
A 20 percent chance of showers and thunderstorms, mainly between 1am and 2am. Mostly cloudy, with a low around 63. North northeast wind 3 to 7 mph.
Tuesday
Partly sunny, with a high near 78. North northeast wind 6 to 9 mph.
Tuesday Night
Partly cloudy, with a low around 57. North wind 5 to 9 mph.
Wednesday
Mostly sunny, with a high near 76. North wind 6 to 9 mph.
Wednesday Night
Mostly clear, with a low around 55. North northeast wind 5 to 8 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 77. North northeast wind 3 to 8 mph.
Thursday Night
Partly cloudy, with a low around 56. North northeast wind around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 78. Calm wind becoming northeast 5 to 7 mph in the morning.
Friday Night
A slight chance of showers. Mostly cloudy, with a low around 57. Light east northeast wind.
Saturday
A slight chance of showers. Partly sunny, with a high near 79. Calm wind becoming east northeast around 5 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Carbondale IL
 37.72°N 89.23°W
Last Update:
1:26 pm CDT Sep 20, 2026
Forecast Valid:
4pm CDT Sep 20, 2026-6pm CDT Sep 26, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation