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

61°F

16°C

Humidity 93%
Wind Speed Calm
Barometer 30.11 in (1019.4 mb)
Dewpoint 59°F (15°C)
Visibility 9.00 mi
Last update 13 Oct 8:52 pm CDT
Extended Forecast for

Alto Pass IL

  • Tonight

    Tonight: Clear, with a low around 57. Calm wind.

    Low: 57 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 80. Calm wind becoming northeast around 6 mph in the afternoon.

    High: 80 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 56. Calm wind.

    Low: 56 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 80. Calm wind becoming east northeast around 6 mph in the afternoon.

    High: 80 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 57. Light east wind.

    Low: 57 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 78. Calm wind becoming east southeast around 6 mph in the morning.

    High: 78 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 56. East wind around 5 mph.

    Low: 56 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 80. South wind 5 to 8 mph.

    High: 80 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 63. South southeast wind around 7 mph.

    Low: 63 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 57. Calm wind.
Tuesday
Sunny, with a high near 80. Calm wind becoming northeast around 6 mph in the afternoon.
Tuesday Night
Clear, with a low around 56. Calm wind.
Wednesday
Sunny, with a high near 80. Calm wind becoming east northeast around 6 mph in the afternoon.
Wednesday Night
Clear, with a low around 57. Light east wind.
Thursday
Sunny, with a high near 78. Calm wind becoming east southeast around 6 mph in the morning.
Thursday Night
Partly cloudy, with a low around 56. East wind around 5 mph.
Friday
Partly sunny, with a high near 80. South wind 5 to 8 mph.
Friday Night
Mostly clear, with a low around 63. South southeast wind around 7 mph.
Saturday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 76. South southwest wind 9 to 11 mph, with gusts as high as 20 mph.
Saturday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 54. South southwest wind 7 to 9 mph.
Sunday
A chance of showers. Sunny, with a high near 69. West northwest wind around 10 mph, with gusts as high as 20 mph.
Sunday Night
Mostly clear, with a low around 47. West northwest wind 3 to 7 mph.
Monday
Sunny, with a high near 71. South southwest wind 5 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Alto Pass IL
 37.57°N 89.32°W
Last Update:
6:46 pm CDT Oct 13, 2025
Forecast Valid:
9pm CDT Oct 13, 2025-6pm CDT Oct 20, 2025
 
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