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

46°F

8°C

Humidity 83%
Wind Speed SE 3 mph
Barometer 30.04 in (1017.1 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 10 Nov 11:52 pm CST
Extended Forecast for

2 Miles WSW Alto Pass IL

  • Overnight

    Overnight: Clear, with a low around 46. Light south southwest wind.

    Low: 46 °F

    Clear

  • Veterans Day

    Veterans Day: Partly sunny, then gradually becoming sunny, with a high near 72. South southwest wind 5 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.

    High: 72 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 43. North northwest wind 8 to 11 mph, with gusts as high as 18 mph.

    Low: 43 °F

    Mostly Clear

  • Thursday

    Thursday: Increasing clouds, with a high near 52. Northwest wind 7 to 15 mph, with gusts as high as 23 mph.

    High: 52 °F

    Increasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 34. North northwest wind 6 to 10 mph.

    Low: 34 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 45. North northwest wind 6 to 11 mph.

    High: 45 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 27. Light north northwest wind.

    Low: 27 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 48. Light north wind.

    High: 48 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 27. Calm wind.

    Low: 27 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 46. Light south southwest wind.
Veterans Day
Partly sunny, then gradually becoming sunny, with a high near 72. South southwest wind 5 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph.
Wednesday Night
Mostly clear, with a low around 43. North northwest wind 8 to 11 mph, with gusts as high as 18 mph.
Thursday
Increasing clouds, with a high near 52. Northwest wind 7 to 15 mph, with gusts as high as 23 mph.
Thursday Night
Mostly clear, with a low around 34. North northwest wind 6 to 10 mph.
Friday
Sunny, with a high near 45. North northwest wind 6 to 11 mph.
Friday Night
Mostly clear, with a low around 27. Light north northwest wind.
Saturday
Sunny, with a high near 48. Light north wind.
Saturday Night
Mostly clear, with a low around 27. Calm wind.
Sunday
Mostly sunny, with a high near 51. Calm wind becoming east around 5 mph.
Sunday Night
Partly cloudy, with a low around 31. Calm wind.
Monday
Mostly sunny, with a high near 51. Calm wind becoming east around 5 mph.
Monday Night
Mostly clear, with a low around 30. Calm wind.
Tuesday
Sunny, with a high near 54. Light northeast wind.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles WSW Alto Pass IL
 37.57°N 89.35°W
Last Update:
12:16 am CST Nov 11, 2026
Forecast Valid:
12am CST Nov 11, 2026-6pm CST Nov 17, 2026
 
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