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.

Fog/Mist

31°F

-1°C

Humidity 89%
Wind Speed S 6 mph
Barometer 29.97 in (1015.1 mb)
Dewpoint 28°F (-2°C)
Visibility 6.00 mi
Wind Chill25°F (-4°C)
Last update 6 Dec 5:52 am CST
Extended Forecast for

2 Miles N Saint Johns IL

  • Today

    Today: Mostly sunny, with a high near 46. Light and variable wind.

    High: 46 °F

    Mostly Sunny

  • Tonight

    Tonight: Cloudy, with a low around 34. Calm wind becoming south around 5 mph after midnight.

    Low: 34 °F

    Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 46. South wind 5 to 11 mph becoming north in the afternoon.

    High: 46 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 22. North wind 7 to 11 mph.

    Low: 22 °F

    Slight Chance
    Snow Showers
    then Mostly
    Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 36. North wind 3 to 7 mph.

    High: 36 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 24. Calm wind becoming south southwest 5 to 9 mph after midnight.

    Low: 24 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.

    High: 48 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39. Southwest wind 14 to 16 mph, with gusts as high as 24 mph.

    Low: 39 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers before noon. Partly sunny, with a high near 48. West southwest wind 10 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.

    High: 48 °F

    Slight Chance
    Showers then
    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 46. Light and variable wind.
Tonight
Cloudy, with a low around 34. Calm wind becoming south around 5 mph after midnight.
Sunday
Mostly cloudy, with a high near 46. South wind 5 to 11 mph becoming north in the afternoon.
Sunday Night
A 20 percent chance of snow showers before midnight. Mostly cloudy, with a low around 22. North wind 7 to 11 mph.
Monday
Mostly sunny, with a high near 36. North wind 3 to 7 mph.
Monday Night
Mostly clear, with a low around 24. Calm wind becoming south southwest 5 to 9 mph after midnight.
Tuesday
Mostly sunny, with a high near 48. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly cloudy, with a low around 39. Southwest wind 14 to 16 mph, with gusts as high as 24 mph.
Wednesday
A slight chance of showers before noon. Partly sunny, with a high near 48. West southwest wind 10 to 16 mph becoming northwest in the afternoon. Winds could gust as high as 24 mph.
Wednesday Night
Mostly cloudy, with a low around 27. Northwest wind 6 to 9 mph becoming northeast after midnight.
Thursday
A slight chance of rain and snow showers. Mostly cloudy, with a high near 40. Northeast wind 7 to 10 mph becoming southwest in the afternoon.
Thursday Night
Mostly cloudy, with a low around 23. East wind 6 to 8 mph becoming northwest in the evening.
Friday
Partly sunny, with a high near 31. North northwest wind 8 to 10 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:
3:16 am CST Dec 6, 2025
Forecast Valid:
6am CST Dec 6, 2025-6pm CST Dec 12, 2025
 
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