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Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Overcast

70°F

21°C

Humidity 82%
Wind Speed SW 5 mph
Barometer 30.00 in (1015.6 mb)
Dewpoint 64°F (18°C)
Visibility 9.00 mi
Last update 23 May 6:52 pm CDT
Extended Forecast for

5 Miles NNW Vergennes IL

  • Tonight

    Tonight: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 61. Calm wind.

    Low: 61 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Sunday

    Sunday: Showers and thunderstorms likely, mainly before 2pm. Partly sunny, with a high near 80. Calm wind. Chance of precipitation is 60%.

    High: 80 °F

    Showers
    Likely then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 62. Calm wind.

    Low: 62 °F

    Increasing
    Clouds

  • Memorial Day

    Memorial Day: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80. Calm wind becoming east around 6 mph in the afternoon. Chance of precipitation is 40%.

    High: 80 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Showers likely, mainly after 1am. Mostly cloudy, with a low around 64. East wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 64 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 79. East southeast wind 3 to 6 mph. Chance of precipitation is 80%.

    High: 79 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. South southeast wind 3 to 6 mph. Chance of precipitation is 70%.

    Low: 66 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 82. South wind around 6 mph.

    High: 82 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 67. South wind around 5 mph becoming calm in the evening.

    Low: 67 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 61. Calm wind.
Sunday
Showers and thunderstorms likely, mainly before 2pm. Partly sunny, with a high near 80. Calm wind. Chance of precipitation is 60%.
Sunday Night
Increasing clouds, with a low around 62. Calm wind.
Memorial Day
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80. Calm wind becoming east around 6 mph in the afternoon. Chance of precipitation is 40%.
Monday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 64. East wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%.
Tuesday
Showers and possibly a thunderstorm. High near 79. East southeast wind 3 to 6 mph. Chance of precipitation is 80%.
Tuesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. South southeast wind 3 to 6 mph. Chance of precipitation is 70%.
Wednesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 82. South wind around 6 mph.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 67. South wind around 5 mph becoming calm in the evening.
Thursday
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 84. Light southeast wind.
Thursday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 65. Light east wind.
Friday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 79. East northeast wind 3 to 8 mph.
Friday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 61. East northeast wind around 7 mph.
Saturday
A slight chance of showers. Mostly sunny, with a high near 79. East northeast wind 6 to 10 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NNW Vergennes IL
 37.97°N 89.36°W
Last Update:
5:31 pm CDT May 23, 2026
Forecast Valid:
7pm CDT May 23, 2026-6pm CDT May 30, 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