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.

Light Rain

53°F

12°C

Humidity 80%
Wind Speed NW 13 G 23 mph
Barometer 30.30 in (1026.0 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Wind Chill49°F (9°C)
Last update 16 Oct 6:52 pm CDT
Extended Forecast for

3 Miles NNE Saint Johns IL

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 39. North wind 11 to 16 mph, with gusts as high as 21 mph.

    Low: 39 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 61. North northeast wind 7 to 10 mph.

    High: 61 °F

    Sunny

  • Saturday Night

    Saturday Night: Areas of frost after 4am. Otherwise, clear, with a low around 34. Calm wind.

    Low: 34 °F

    Clear then
    Areas Frost

  • Sunday

    Sunday: Areas of frost before 8am. Otherwise, sunny, with a high near 67. Calm wind becoming southeast around 6 mph in the morning.

    High: 67 °F

    Areas Frost
    then Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 37. Light east southeast wind.

    Low: 37 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 71. Light east wind.

    High: 71 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 39. Calm wind.

    Low: 39 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 74. Calm wind becoming east northeast around 5 mph in the afternoon.

    High: 74 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 41. Calm wind.

    Low: 41 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 39. North wind 11 to 16 mph, with gusts as high as 21 mph.
Saturday
Sunny, with a high near 61. North northeast wind 7 to 10 mph.
Saturday Night
Areas of frost after 4am. Otherwise, clear, with a low around 34. Calm wind.
Sunday
Areas of frost before 8am. Otherwise, sunny, with a high near 67. Calm wind becoming southeast around 6 mph in the morning.
Sunday Night
Clear, with a low around 37. Light east southeast wind.
Monday
Sunny, with a high near 71. Light east wind.
Monday Night
Mostly clear, with a low around 39. Calm wind.
Tuesday
Sunny, with a high near 74. Calm wind becoming east northeast around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 41. Calm wind.
Wednesday
Sunny, with a high near 77. Light east wind.
Wednesday Night
Clear, with a low around 43. Calm wind.
Thursday
Sunny, with a high near 80. Light and variable wind.
Thursday Night
Mostly clear, with a low around 47. Calm wind.
Friday
Sunny, with a high near 81. Calm wind becoming east around 5 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNE Saint Johns IL
 38.08°N 89.21°W
Last Update:
4:36 pm CDT Oct 16, 2026
Forecast Valid:
7pm CDT Oct 16, 2026-6pm CDT Oct 23, 2026
 
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