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Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

75°F

24°C

Humidity 79%
Wind Speed SE 6 mph
Barometer 29.94 in (1013.6 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Last update 13 Oct 9:52 pm CDT
Extended Forecast for

Alto Pass IL

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 71. South southwest wind around 5 mph.

    Low: 71 °F

    Clear then
    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms before 11am, then showers likely and possibly a thunderstorm between 11am and 3pm, then a chance of showers and thunderstorms after 3pm. High near 83. South southwest wind 5 to 7 mph becoming north in the morning. Chance of precipitation is 80%.

    High: 83 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 60%.

    Low: 67 °F

    Showers
    Likely

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85. Light and variable wind becoming southwest 5 to 10 mph in the morning.

    High: 85 °F

    Chance
    T-storms then
    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 4am, then a chance of showers after 4am. Partly cloudy, with a low around 55. South southwest wind 6 to 15 mph becoming north northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 40%.

    Low: 55 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 60. North northwest wind around 18 mph, with gusts as high as 29 mph.

    High: 60 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 40. North wind 7 to 15 mph, with gusts as high as 21 mph.

    Low: 40 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 61. Northeast wind 5 to 7 mph.

    High: 61 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 39. Calm wind.

    Low: 39 °F

    Clear

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms after 4am. Mostly clear, with a low around 71. South southwest wind around 5 mph.
Wednesday
Showers and thunderstorms before 11am, then showers likely and possibly a thunderstorm between 11am and 3pm, then a chance of showers and thunderstorms after 3pm. High near 83. South southwest wind 5 to 7 mph becoming north in the morning. Chance of precipitation is 80%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 67. Calm wind. Chance of precipitation is 60%.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85. Light and variable wind becoming southwest 5 to 10 mph in the morning.
Thursday Night
A chance of showers before 10pm, then a chance of showers and thunderstorms between 10pm and 4am, then a chance of showers after 4am. Partly cloudy, with a low around 55. South southwest wind 6 to 15 mph becoming north northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 40%.
Friday
Mostly sunny, with a high near 60. North northwest wind around 18 mph, with gusts as high as 29 mph.
Friday Night
Mostly clear, with a low around 40. North wind 7 to 15 mph, with gusts as high as 21 mph.
Saturday
Sunny, with a high near 61. Northeast wind 5 to 7 mph.
Saturday Night
Clear, with a low around 39. Calm wind.
Sunday
Sunny, with a high near 68. Calm wind becoming south around 6 mph in the morning.
Sunday Night
Partly cloudy, with a low around 48. Light south wind.
Monday
Mostly sunny, with a high near 70. South wind 3 to 7 mph.
Monday Night
Partly cloudy, with a low around 52. Calm wind.
Tuesday
Mostly sunny, with a high near 76. Calm wind becoming south around 5 mph in the afternoon.
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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:
6:01 pm CDT Oct 13, 2026
Forecast Valid:
10pm CDT Oct 13, 2026-6pm CDT Oct 20, 2026
 
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