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

63°F

17°C

Humidity 68%
Wind Speed S 13 mph
Barometer 30.10 in (1019.1 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 30 Mar 3:52 am CDT
Extended Forecast for

3 Miles SW Vergennes IL

  • Today

    Today: Mostly sunny, with a high near 80. Breezy, with a south southwest wind 15 to 23 mph, with gusts as high as 33 mph.

    High: 80 °F

    Mostly Sunny
    and Breezy

  • Tonight

    Tonight: Mostly clear, with a low around 64. South southwest wind 16 to 18 mph, with gusts as high as 29 mph.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. Breezy, with a south southwest wind 17 to 23 mph, with gusts as high as 36 mph.

    High: 82 °F

    Mostly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 63. South southwest wind 10 to 16 mph, with gusts as high as 25 mph.

    Low: 63 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm before 10am, then showers likely between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 80. South wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.

    High: 80 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South wind 11 to 16 mph, with gusts as high as 24 mph.

    Low: 66 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. Breezy, with a south wind 16 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 70%.

    High: 77 °F

    Breezy.
    Chance
    T-storms then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Mostly cloudy, with a low around 62. Breezy, with a south wind 16 to 20 mph, with gusts as high as 26 mph.

    Low: 62 °F

    Showers and
    Breezy

  • Friday

    Friday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. South wind around 14 mph, with gusts as high as 21 mph.

    High: 77 °F

    Showers
    Likely

Detailed Forecast

Today
Mostly sunny, with a high near 80. Breezy, with a south southwest wind 15 to 23 mph, with gusts as high as 33 mph.
Tonight
Mostly clear, with a low around 64. South southwest wind 16 to 18 mph, with gusts as high as 29 mph.
Tuesday
Mostly sunny, with a high near 82. Breezy, with a south southwest wind 17 to 23 mph, with gusts as high as 36 mph.
Tuesday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 63. South southwest wind 10 to 16 mph, with gusts as high as 25 mph.
Wednesday
Showers likely and possibly a thunderstorm before 10am, then showers likely between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 80. South wind 8 to 11 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South wind 11 to 16 mph, with gusts as high as 24 mph.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. Breezy, with a south wind 16 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 70%.
Thursday Night
Showers and possibly a thunderstorm. Mostly cloudy, with a low around 62. Breezy, with a south wind 16 to 20 mph, with gusts as high as 26 mph.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 77. South wind around 14 mph, with gusts as high as 21 mph.
Friday Night
Showers likely, mainly after 1am. Mostly cloudy, with a low around 60. South southeast wind around 14 mph, with gusts as high as 21 mph.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 71. South wind 14 to 17 mph becoming west in the afternoon. Winds could gust as high as 24 mph.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 42. West northwest wind around 15 mph, with gusts as high as 21 mph.
Sunday
A chance of showers. Mostly sunny, with a high near 59. Northwest wind around 15 mph, with gusts as high as 22 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:
1:26 am CDT Mar 30, 2026
Forecast Valid:
4am CDT Mar 30, 2026-6pm CDT Apr 5, 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