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

84°F

29°C

Humidity 51%
Wind Speed Calm
Barometer 29.94 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 3 Aug 3:52 pm CDT
Extended Forecast for

Carbondale IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 85. North northeast wind around 5 mph.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Patchy fog after 5am. Otherwise, mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear
    then Patchy
    Fog

  • Tuesday

    Tuesday: Patchy fog before 8am. Otherwise, sunny, with a high near 87. Calm wind.

    High: 87 °F

    Patchy Fog
    then Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 65. Calm wind.

    Low: 65 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 89. Calm wind.

    High: 89 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 69. Calm wind.

    Low: 69 °F

    Mostly Clear

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 87. Calm wind becoming south southwest around 6 mph in the morning.

    High: 87 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms. Partly sunny, with a high near 87. Calm wind becoming south southwest around 5 mph in the afternoon.

    High: 87 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 85. North northeast wind around 5 mph.
Tonight
Patchy fog after 5am. Otherwise, mostly clear, with a low around 64. Calm wind.
Tuesday
Patchy fog before 8am. Otherwise, sunny, with a high near 87. Calm wind.
Tuesday Night
Clear, with a low around 65. Calm wind.
Wednesday
Sunny, with a high near 89. Calm wind.
Wednesday Night
Mostly clear, with a low around 69. Calm wind.
Thursday
A 30 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 87. Calm wind becoming south southwest around 6 mph in the morning.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 70. Calm wind.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Calm wind becoming south southwest around 5 mph in the afternoon.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 69. Calm wind.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 88. Calm wind becoming south southwest around 5 mph.
Saturday Night
Mostly clear, with a low around 70. Light south wind.
Sunday
Mostly sunny, with a high near 91. Calm wind becoming south southwest 5 to 7 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Carbondale IL
 37.72°N 89.2°W
Last Update:
1:26 pm CDT Aug 3, 2026
Forecast Valid:
4pm CDT Aug 3, 2026-6pm CDT Aug 9, 2026
 
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Additional Resources

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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