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.

Overcast

60°F

16°C

Humidity 90%
Wind Speed Calm
Barometer 30.08 in (1018.6 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 3 Mar 9:52 pm CST
Extended Forecast for

3 Miles SW Vergennes IL

  • Tonight

    Tonight: A slight chance of showers before 3am, then a chance of showers and thunderstorms between 3am and 5am, then showers likely and possibly a thunderstorm after 5am. Cloudy, with a low around 57. South southwest wind 3 to 7 mph. Chance of precipitation is 60%.

    Low: 57 °F

    Mostly Cloudy
    then Showers
    Likely

  • Wednesday

    Wednesday: Showers and thunderstorms before 3pm, then showers and possibly a thunderstorm, mainly after 3pm. High near 70. South southwest wind 5 to 10 mph. Chance of precipitation is 90%.

    High: 70 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms before midnight, then showers and possibly a thunderstorm, mainly after midnight. Some of the storms could produce heavy rainfall. Low around 58. South wind 6 to 10 mph. Chance of precipitation is 90%.

    Low: 58 °F

    Heavy Rain

  • Thursday

    Thursday: Showers and possibly a thunderstorm before 9am, then showers between 9am and noon, then a chance of showers and thunderstorms after noon. High near 71. Southwest wind 7 to 11 mph. Chance of precipitation is 90%.

    High: 71 °F

    Showers then
    Chance
    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59. South wind 6 to 9 mph.

    Low: 59 °F

    Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers. Partly sunny, with a high near 78. South wind 10 to 18 mph, with gusts as high as 26 mph.

    High: 78 °F

    Slight Chance
    Showers

  • Friday Night

    Friday Night: A slight chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 61. South wind 11 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 70%.

    Low: 61 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Showers and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 70. South southwest wind 7 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 70 °F

    Showers

  • Saturday Night

    Saturday Night: A slight chance of showers after midnight. Partly cloudy, with a low around 46. North northwest wind 3 to 6 mph.

    Low: 46 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
A slight chance of showers before 3am, then a chance of showers and thunderstorms between 3am and 5am, then showers likely and possibly a thunderstorm after 5am. Cloudy, with a low around 57. South southwest wind 3 to 7 mph. Chance of precipitation is 60%.
Wednesday
Showers and thunderstorms before 3pm, then showers and possibly a thunderstorm, mainly after 3pm. High near 70. South southwest wind 5 to 10 mph. Chance of precipitation is 90%.
Wednesday Night
Showers and thunderstorms before midnight, then showers and possibly a thunderstorm, mainly after midnight. Some of the storms could produce heavy rainfall. Low around 58. South wind 6 to 10 mph. Chance of precipitation is 90%.
Thursday
Showers and possibly a thunderstorm before 9am, then showers between 9am and noon, then a chance of showers and thunderstorms after noon. High near 71. Southwest wind 7 to 11 mph. Chance of precipitation is 90%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 59. South wind 6 to 9 mph.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 78. South wind 10 to 18 mph, with gusts as high as 26 mph.
Friday Night
A slight chance of showers, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 61. South wind 11 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 70%.
Saturday
Showers and possibly a thunderstorm before noon, then a chance of showers. Mostly cloudy, with a high near 70. South southwest wind 7 to 14 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph.
Saturday Night
A slight chance of showers after midnight. Partly cloudy, with a low around 46. North northwest wind 3 to 6 mph.
Sunday
A slight chance of showers before noon. Mostly sunny, with a high near 67. Light and variable wind becoming southwest 5 to 8 mph in the morning.
Sunday Night
A slight chance of showers. Mostly clear, with a low around 50. Southwest wind around 6 mph.
Monday
A slight chance of showers. Sunny, with a high near 74. South southwest wind 6 to 10 mph.
Monday Night
A chance of showers and thunderstorms. Mostly clear, with a low around 58. South southwest wind 10 to 13 mph, with gusts as high as 20 mph.
Tuesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 77. South southwest wind 13 to 17 mph, with gusts as high as 25 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles SW Vergennes IL
 37.86°N 89.39°W
Last Update:
9:46 pm CST Mar 3, 2026
Forecast Valid:
10pm CST Mar 3, 2026-6pm CDT Mar 10, 2026
 
Forecast Discussion
 
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Additional Resources

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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