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

55°F

13°C

Humidity 44%
Wind Speed E 8 mph
Barometer 30.34 in (1027.5 mb)
Dewpoint 33°F (1°C)
Visibility 10.00 mi
Wind Chill53°F (12°C)
Last update 20 Apr 9:52 am CDT
Extended Forecast for

2 Miles N Saint Johns IL

  • Today

    Today: Sunny, with a high near 67. East wind around 6 mph becoming light and variable in the afternoon.

    High: 67 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 49. South southeast wind 5 to 7 mph.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. 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: Clear, with a low around 56. South wind around 6 mph.

    Low: 56 °F

    Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 80. South wind 7 to 16 mph, with gusts as high as 24 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 11 to 13 mph, with gusts as high as 22 mph.

    Low: 63 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Friday

    Friday: Showers and possibly a thunderstorm. Mostly cloudy, with a high near 75. South wind 11 to 13 mph, with gusts as high as 21 mph.

    High: 75 °F

    Showers

Detailed Forecast

Today
Sunny, with a high near 67. East wind around 6 mph becoming light and variable in the afternoon.
Tonight
Mostly clear, with a low around 49. South southeast wind 5 to 7 mph.
Tuesday
Mostly sunny, with a high near 77. 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
Clear, with a low around 56. South wind around 6 mph.
Thursday
Mostly sunny, with a high near 80. South wind 7 to 16 mph, with gusts as high as 24 mph.
Thursday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63. South wind 11 to 13 mph, with gusts as high as 22 mph.
Friday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 75. South wind 11 to 13 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 8 mph becoming north northwest after midnight.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 74. North wind 7 to 9 mph.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 52. North northeast wind around 6 mph.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 74. North northeast wind 7 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N Saint Johns IL
 38.06°N 89.24°W
Last Update:
7:36 am CDT Apr 20, 2026
Forecast Valid:
10am CDT Apr 20, 2026-6pm CDT Apr 26, 2026
 
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Additional Resources

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Chance of Precipitation