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

36°F

2°C

Humidity 50%
Wind Speed W 9 mph
Barometer 30.52 in (1033.7 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 11 Jan 12:52 pm CST
Extended Forecast for

2 Miles ENE Saint Johns IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 39. Northwest wind 5 to 7 mph.

    High: 39 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 23. Calm wind becoming south southwest 5 to 7 mph after midnight.

    Low: 23 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 51. Southwest wind 8 to 11 mph.

    High: 51 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 34. South southwest wind 6 to 9 mph.

    Low: 34 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 59. Southwest wind 10 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 40. Southwest wind 7 to 10 mph becoming west northwest after midnight.

    Low: 40 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers. Mostly cloudy, with a high near 45. Breezy, with a northwest wind 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 28 mph.

    High: 45 °F

    Slight Chance
    Showers and
    Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 18. North northwest wind 13 to 18 mph, with gusts as high as 26 mph.

    Low: 18 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 34. North northwest wind 6 to 11 mph, with gusts as high as 20 mph.

    High: 34 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 39. Northwest wind 5 to 7 mph.
Tonight
Clear, with a low around 23. Calm wind becoming south southwest 5 to 7 mph after midnight.
Monday
Sunny, with a high near 51. Southwest wind 8 to 11 mph.
Monday Night
Mostly clear, with a low around 34. South southwest wind 6 to 9 mph.
Tuesday
Mostly sunny, with a high near 59. Southwest wind 10 to 14 mph, with gusts as high as 21 mph.
Tuesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 40. Southwest wind 7 to 10 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 9 to 14 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 28 mph.
Wednesday Night
Mostly cloudy, with a low around 18. North northwest wind 13 to 18 mph, with gusts as high as 26 mph.
Thursday
Mostly sunny, with a high near 34. North northwest wind 6 to 11 mph, with gusts as high as 20 mph.
Thursday Night
Mostly cloudy, with a low around 25. South southwest wind 5 to 9 mph.
Friday
Partly sunny, with a high near 43. Southwest wind 10 to 14 mph, with gusts as high as 21 mph.
Friday Night
Mostly cloudy, with a low around 24. West wind 6 to 9 mph.
Saturday
Partly sunny, with a high near 34. West northwest wind 9 to 14 mph, with gusts as high as 20 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Saint Johns IL
 38.03°N 89.19°W
Last Update:
1:17 pm CST Jan 11, 2026
Forecast Valid:
1pm CST Jan 11, 2026-6pm CST Jan 17, 2026
 
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