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

26°F

-3°C

Humidity 75%
Wind Speed Calm
Barometer 30.52 in (1033.9 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 11 Jan 7:52 pm CST
Extended Forecast for

3 Miles SSE Alto Pass IL

  • Tonight

    Tonight: Clear, with a low around 24. Calm wind becoming south southwest around 6 mph after midnight.

    Low: 24 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 49. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.

    High: 49 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 34. South southwest wind around 7 mph.

    Low: 34 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 58. Southwest wind 8 to 13 mph, with gusts as high as 22 mph.

    High: 58 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 41. West southwest wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 41 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers. Partly sunny, with a high near 47. Northwest wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 29 mph.

    High: 47 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 19. North northwest wind 13 to 18 mph, with gusts as high as 29 mph.

    Low: 19 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 34. North northwest wind 5 to 11 mph, with gusts as high as 21 mph.

    High: 34 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 25. South southwest wind 3 to 7 mph.

    Low: 25 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 24. Calm wind becoming south southwest around 6 mph after midnight.
Monday
Sunny, with a high near 49. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 34. South southwest wind around 7 mph.
Tuesday
Mostly sunny, with a high near 58. Southwest wind 8 to 13 mph, with gusts as high as 22 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 41. West southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 47. Northwest wind 7 to 12 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 29 mph.
Wednesday Night
Mostly cloudy, with a low around 19. North northwest wind 13 to 18 mph, with gusts as high as 29 mph.
Thursday
Sunny, with a high near 34. North northwest wind 5 to 11 mph, with gusts as high as 21 mph.
Thursday Night
Mostly cloudy, with a low around 25. South southwest wind 3 to 7 mph.
Friday
Partly sunny, with a high near 44. West southwest wind 7 to 10 mph, with gusts as high as 20 mph.
Friday Night
Mostly cloudy, with a low around 25. West wind around 7 mph.
Saturday
Partly sunny, with a high near 35. West northwest wind 7 to 10 mph, with gusts as high as 18 mph.
Saturday Night
Partly cloudy, with a low around 18. Northwest wind around 6 mph.
Sunday
Sunny, with a high near 32. West wind 6 to 10 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SSE Alto Pass IL
 37.52°N 89.3°W
Last Update:
6:12 pm CST Jan 11, 2026
Forecast Valid:
8pm CST Jan 11, 2026-6pm CST Jan 18, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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