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

24°F

-4°C

Humidity 84%
Wind Speed Calm
Barometer 30.48 in (1032.7 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Last update 11 Jan 9:52 pm CST
Extended Forecast for

3 Miles NW Saint Johns IL

  • Tonight

    Tonight: Clear, with a low around 24. Calm wind becoming south southwest 5 to 7 mph after midnight.

    Low: 24 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 50. South southwest wind 7 to 10 mph.

    High: 50 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 35. South southwest wind 6 to 8 mph.

    Low: 35 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 59. Southwest wind 9 to 14 mph, with gusts as high as 21 mph.

    High: 59 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 41. Southwest wind 7 to 9 mph becoming west northwest after midnight.

    Low: 41 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers. Mostly cloudy, with a high near 45. Breezy, with a northwest wind 10 to 20 mph, with gusts as high as 30 mph.

    High: 45 °F

    Slight Chance
    Showers and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 19. Blustery, with a north northwest wind 14 to 20 mph, with gusts as high as 28 mph.

    Low: 19 °F

    Mostly Cloudy
    and Blustery
    then Partly
    Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 33. North northwest wind 6 to 13 mph, with gusts as high as 22 mph.

    High: 33 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 26. South southwest wind 5 to 9 mph.

    Low: 26 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 24. Calm wind becoming south southwest 5 to 7 mph after midnight.
Monday
Sunny, with a high near 50. South southwest wind 7 to 10 mph.
Monday Night
Mostly clear, with a low around 35. South southwest wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 59. Southwest wind 9 to 14 mph, with gusts as high as 21 mph.
Tuesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 41. Southwest wind 7 to 9 mph becoming west northwest after midnight.
Wednesday
A 20 percent chance of showers. Mostly cloudy, with a high near 45. Breezy, with a northwest wind 10 to 20 mph, with gusts as high as 30 mph.
Wednesday Night
Mostly cloudy, with a low around 19. Blustery, with a north northwest wind 14 to 20 mph, with gusts as high as 28 mph.
Thursday
Mostly sunny, with a high near 33. North northwest wind 6 to 13 mph, with gusts as high as 22 mph.
Thursday Night
Mostly cloudy, with a low around 26. South southwest wind 5 to 9 mph.
Friday
Partly sunny, with a high near 43. Southwest wind 8 to 14 mph, with gusts as high as 21 mph.
Friday Night
Mostly cloudy, with a low around 25. West wind 6 to 9 mph.
Saturday
Partly sunny, with a high near 33. West northwest wind 9 to 13 mph, with gusts as high as 20 mph.
Saturday Night
Partly cloudy, with a low around 18. West wind 6 to 8 mph.
Sunday
Sunny, with a high near 32. West wind 8 to 13 mph, with gusts as high as 18 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NW Saint Johns IL
 38.06°N 89.27°W
Last Update:
6:12 pm CST Jan 11, 2026
Forecast Valid:
10pm CST Jan 11, 2026-6pm CST Jan 18, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation