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

50°F

10°C

Humidity 96%
Wind Speed S 3 mph
Barometer 30.01 in (1015.9 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 6 Oct 11:52 pm CDT
Extended Forecast for

2 Miles N Saint Johns IL

  • Overnight

    Overnight: Clear, with a low around 52. Calm wind.

    Low: 52 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88. Light south southwest wind becoming west southwest 5 to 9 mph in the morning.

    High: 88 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 57. Light and variable wind.

    Low: 57 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 85. Calm wind becoming north 5 to 7 mph in the afternoon.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 53. Light northeast wind.

    Low: 53 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 84. Light and variable wind becoming southeast 5 to 8 mph in the morning.

    High: 84 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 56. Southeast wind around 5 mph becoming calm in the evening.

    Low: 56 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 87. Light south southeast wind increasing to 8 to 13 mph in the morning.

    High: 87 °F

    Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 58. Southeast wind 5 to 7 mph.

    Low: 58 °F

    Chance
    Showers

Detailed Forecast

Overnight
Clear, with a low around 52. Calm wind.
Wednesday
Sunny, with a high near 88. Light south southwest wind becoming west southwest 5 to 9 mph in the morning.
Wednesday Night
Clear, with a low around 57. Light and variable wind.
Thursday
Sunny, with a high near 85. Calm wind becoming north 5 to 7 mph in the afternoon.
Thursday Night
Clear, with a low around 53. Light northeast wind.
Friday
Sunny, with a high near 84. Light and variable wind becoming southeast 5 to 8 mph in the morning.
Friday Night
Clear, with a low around 56. Southeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 87. Light south southeast wind increasing to 8 to 13 mph in the morning.
Saturday Night
A slight chance of showers, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 58. Southeast wind 5 to 7 mph.
Sunday
A chance of showers, mainly before 1pm. Partly sunny, with a high near 78. East wind 6 to 10 mph.
Sunday Night
Partly cloudy, with a low around 57. North wind around 5 mph becoming calm in the evening.
Columbus Day
Mostly sunny, with a high near 82. Calm wind becoming north northwest 5 to 9 mph in the morning.
Monday Night
Partly cloudy, with a low around 57. East wind around 6 mph becoming light and variable.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 82. South southwest wind 5 to 11 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:
11:36 pm CDT Oct 6, 2026
Forecast Valid:
12am CDT Oct 7, 2026-6pm CDT Oct 13, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation