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

30°F

-1°C

Humidity 96%
Wind Speed N 5 mph
Barometer 29.89 in (1012.3 mb)
Dewpoint 29°F (-2°C)
Visibility 1.00 mi
Wind Chill25°F (-4°C)
Last update 1 Jan 11:52 pm CST
Extended Forecast for

2 Miles N Saint Johns IL

  • Overnight

    Overnight: Patchy fog between 3am and 4am. Otherwise, mostly cloudy, with a low around 29. Calm wind.

    Low: 29 °F

    Patchy Fog

  • Friday

    Friday: Cloudy, with a high near 40. East northeast wind 3 to 7 mph.

    High: 40 °F

    Cloudy

  • Friday Night

    Friday Night: Cloudy, with a low around 28. Northeast wind around 6 mph.

    Low: 28 °F

    Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 41. North northeast wind 5 to 7 mph.

    High: 41 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 25. Light north northwest wind.

    Low: 25 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 42. Light and variable wind.

    High: 42 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 32. Calm wind becoming south southwest 5 to 8 mph in the evening.

    Low: 32 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 56. South southwest wind 8 to 11 mph, with gusts as high as 18 mph.

    High: 56 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 44. South wind 7 to 9 mph.

    Low: 44 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy fog between 3am and 4am. Otherwise, mostly cloudy, with a low around 29. Calm wind.
Friday
Cloudy, with a high near 40. East northeast wind 3 to 7 mph.
Friday Night
Cloudy, with a low around 28. Northeast wind around 6 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 41. North northeast wind 5 to 7 mph.
Saturday Night
Mostly clear, with a low around 25. Light north northwest wind.
Sunday
Mostly sunny, with a high near 42. Light and variable wind.
Sunday Night
Partly cloudy, with a low around 32. Calm wind becoming south southwest 5 to 8 mph in the evening.
Monday
Mostly sunny, with a high near 56. South southwest wind 8 to 11 mph, with gusts as high as 18 mph.
Monday Night
Partly cloudy, with a low around 44. South wind 7 to 9 mph.
Tuesday
Partly sunny, with a high near 62. Southwest wind 8 to 11 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly cloudy, with a low around 40. South southwest wind 5 to 7 mph becoming light and variable after midnight.
Wednesday
Partly sunny, with a high near 57. Light and variable wind becoming southwest around 6 mph in the morning.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 43. Southeast wind 3 to 6 mph.
Thursday
A chance of showers. Mostly cloudy, with a high near 60. South southeast wind 6 to 9 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N Saint Johns IL
 38.06°N 89.24°W
Last Update:
10:51 pm CST Jan 1, 2026
Forecast Valid:
12am CST Jan 2, 2026-6pm CST Jan 8, 2026
 
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