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

50°F

10°C

Humidity 63%
Wind Speed NE 8 mph
Barometer 30.25 in (1024.2 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill47°F (8°C)
Last update 20 Apr 1:52 am CDT
Extended Forecast for

3 Miles SW Vergennes IL

  • Overnight

    Overnight: Mostly clear, with a low around 41. Northeast wind 3 to 5 mph.

    Low: 41 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 68. Light and variable wind becoming east around 6 mph.

    High: 68 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 50. Southeast wind 5 to 7 mph.

    Low: 50 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. South southwest wind 7 to 15 mph, with gusts as high as 23 mph.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 54. South southwest wind 7 to 11 mph, with gusts as high as 20 mph.

    Low: 54 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 77. Southwest wind 6 to 10 mph.

    High: 77 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 56. South wind around 7 mph.

    Low: 56 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 80. South wind 8 to 17 mph, with gusts as high as 25 mph.

    High: 80 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63. South wind around 14 mph, with gusts as high as 23 mph.

    Low: 63 °F

    Mostly Cloudy
    then Chance
    Showers

Detailed Forecast

Overnight
Mostly clear, with a low around 41. Northeast wind 3 to 5 mph.
Monday
Sunny, with a high near 68. Light and variable wind becoming east around 6 mph.
Monday Night
Mostly clear, with a low around 50. Southeast wind 5 to 7 mph.
Tuesday
Mostly sunny, with a high near 77. South southwest wind 7 to 15 mph, with gusts as high as 23 mph.
Tuesday Night
Mostly clear, with a low around 54. South southwest wind 7 to 11 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 77. Southwest wind 6 to 10 mph.
Wednesday Night
Mostly clear, with a low around 56. South wind around 7 mph.
Thursday
Mostly sunny, with a high near 80. South wind 8 to 17 mph, with gusts as high as 25 mph.
Thursday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63. South wind around 14 mph, with gusts as high as 23 mph.
Friday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 76. South wind 11 to 14 mph, with gusts as high as 21 mph.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 54. Southwest wind around 9 mph becoming north after midnight.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 74. North wind around 9 mph.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 52. North northeast wind around 7 mph.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 74. North northeast wind around 9 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 Apr 20, 2026
Forecast Valid:
2am CDT Apr 20, 2026-6pm CDT Apr 26, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation