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

37°F

3°C

Humidity 65%
Wind Speed NW 5 mph
Barometer 30.08 in (1018.6 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 21 Feb 12:52 am CST
Extended Forecast for

Carbondale IL

  • Overnight

    Overnight: A 30 percent chance of snow showers, mainly between 3am and 4am. Mostly cloudy, with a low around 33. Calm wind becoming north around 5 mph.

    Low: 33 °F

    Chance Snow
    Showers

  • Saturday

    Saturday: A chance of snow showers before 1pm, then a chance of sprinkles between 1pm and 2pm. Mostly cloudy, with a high near 42. North wind 6 to 8 mph. Chance of precipitation is 20%.

    High: 42 °F

    Slight Chance
    Snow Showers
    then Slight
    Chance
    Sprinkles/Snow

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 24. Northwest wind 7 to 13 mph, with gusts as high as 22 mph.

    Low: 24 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 36. Northwest wind 14 to 18 mph, with gusts as high as 30 mph.

    High: 36 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 17. North northwest wind around 15 mph, with gusts as high as 24 mph.

    Low: 17 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 34. North northwest wind 7 to 14 mph, with gusts as high as 23 mph.

    High: 34 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 18. Northwest wind around 6 mph becoming calm in the evening.

    Low: 18 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 49. South southwest wind 5 to 14 mph, with gusts as high as 25 mph.

    High: 49 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40. South southwest wind 11 to 13 mph, with gusts as high as 22 mph.

    Low: 40 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of snow showers, mainly between 3am and 4am. Mostly cloudy, with a low around 33. Calm wind becoming north around 5 mph.
Saturday
A chance of snow showers before 1pm, then a chance of sprinkles between 1pm and 2pm. Mostly cloudy, with a high near 42. North wind 6 to 8 mph. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 24. Northwest wind 7 to 13 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 36. Northwest wind 14 to 18 mph, with gusts as high as 30 mph.
Sunday Night
Mostly clear, with a low around 17. North northwest wind around 15 mph, with gusts as high as 24 mph.
Monday
Sunny, with a high near 34. North northwest wind 7 to 14 mph, with gusts as high as 23 mph.
Monday Night
Mostly clear, with a low around 18. Northwest wind around 6 mph becoming calm in the evening.
Tuesday
Partly sunny, with a high near 49. South southwest wind 5 to 14 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 40. South southwest wind 11 to 13 mph, with gusts as high as 22 mph.
Wednesday
Partly sunny, with a high near 62. South southwest wind 11 to 14 mph, with gusts as high as 23 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 41. South southwest wind 7 to 10 mph becoming northwest after midnight.
Thursday
A chance of showers. Partly sunny, with a high near 54. Northwest wind 7 to 9 mph.
Thursday Night
A slight chance of showers. Mostly clear, with a low around 31. Northwest wind around 6 mph becoming southwest after midnight.
Friday
Sunny, with a high near 59. South southwest wind 5 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Carbondale IL
 37.72°N 89.23°W
Last Update:
1:31 am CST Feb 21, 2026
Forecast Valid:
1am CST Feb 21, 2026-6pm CST Feb 27, 2026
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation