National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fog/Mist

43°F

6°C

Humidity 100%
Wind Speed Calm
Barometer 30.20 in (1022.7 mb)
Dewpoint 43°F (6°C)
Visibility 1.00 mi
Last update 23 Nov 5:52 am CST
Extended Forecast for

2 Miles N Saint Johns IL

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 58. Light and variable wind.

    High: 58 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Patchy fog between 9pm and midnight. Otherwise, increasing clouds, with a low around 42. Light and variable wind.

    Low: 42 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Monday

    Monday: Showers likely after noon. Cloudy, with a high near 58. Light southeast wind becoming south southeast 5 to 9 mph in the morning. Chance of precipitation is 60%.

    High: 58 °F

    Mostly Cloudy
    then Showers
    Likely

  • Monday Night

    Monday Night: Showers. Low around 50. Southeast wind around 6 mph becoming south southwest after midnight. Chance of precipitation is 100%.

    Low: 50 °F

    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers. Mostly cloudy, with a high near 63. West wind 5 to 9 mph.

    High: 63 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 37. West wind 5 to 13 mph, with gusts as high as 20 mph.

    Low: 37 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 48. West northwest wind 8 to 15 mph, with gusts as high as 21 mph.

    High: 48 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 28. West northwest wind around 6 mph.

    Low: 28 °F

    Partly Cloudy

  • Thanksgiving Day

    Thanksgiving Day: Sunny, with a high near 46. West northwest wind 5 to 9 mph.

    High: 46 °F

    Sunny

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 58. Light and variable wind.
Tonight
Patchy fog between 9pm and midnight. Otherwise, increasing clouds, with a low around 42. Light and variable wind.
Monday
Showers likely after noon. Cloudy, with a high near 58. Light southeast wind becoming south southeast 5 to 9 mph in the morning. Chance of precipitation is 60%.
Monday Night
Showers. Low around 50. Southeast wind around 6 mph becoming south southwest after midnight. Chance of precipitation is 100%.
Tuesday
A 20 percent chance of showers. Mostly cloudy, with a high near 63. West wind 5 to 9 mph.
Tuesday Night
Partly cloudy, with a low around 37. West wind 5 to 13 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 48. West northwest wind 8 to 15 mph, with gusts as high as 21 mph.
Wednesday Night
Partly cloudy, with a low around 28. West northwest wind around 6 mph.
Thanksgiving Day
Sunny, with a high near 46. West northwest wind 5 to 9 mph.
Thursday Night
Partly cloudy, with a low around 26. Light and variable wind.
Friday
Partly sunny, with a high near 46. Calm wind becoming south 5 to 7 mph in the morning.
Friday Night
Mostly cloudy, with a low around 33. South southeast wind 3 to 7 mph.
Saturday
A chance of showers. Mostly cloudy, with a high near 49. South southeast wind 7 to 10 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:
4:21 am CST Nov 23, 2025
Forecast Valid:
6am CST Nov 23, 2025-6pm CST Nov 29, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation