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

56°F

13°C

Humidity 100%
Wind Speed Calm
Barometer 30.16 in (1021.2 mb)
Dewpoint 56°F (13°C)
Visibility 9.00 mi
Last update 5 Oct 7:52 am CDT
Extended Forecast for

2 Miles N Saint Johns IL

  • Today

    Today: Sunny, with a high near 86. Light and variable wind becoming south 6 to 11 mph in the morning. Winds could gust as high as 20 mph.

    High: 86 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 63. South southeast wind around 6 mph.

    Low: 63 °F

    Mostly Clear

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 84. South wind 5 to 9 mph. Chance of precipitation is 50%.

    High: 84 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. South southeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 66 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79. Calm wind becoming north northwest 5 to 8 mph in the morning. Chance of precipitation is 60%.

    High: 79 °F

    Showers
    Likely

  • Tuesday Night

    Tuesday Night: A slight chance of showers before 10pm, then a slight chance of showers and thunderstorms between 10pm and 1am. Mostly cloudy, with a low around 57. North northeast wind around 8 mph. Chance of precipitation is 20%.

    Low: 57 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 76. Northeast wind 8 to 11 mph.

    High: 76 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 52. East northeast wind 5 to 7 mph.

    Low: 52 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 77. East northeast wind 6 to 8 mph.

    High: 77 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 86. Light and variable wind becoming south 6 to 11 mph in the morning. Winds could gust as high as 20 mph.
Tonight
Mostly clear, with a low around 63. South southeast wind around 6 mph.
Monday
A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 84. South wind 5 to 9 mph. Chance of precipitation is 50%.
Monday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 66. South southeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%.
Tuesday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 79. Calm wind becoming north northwest 5 to 8 mph in the morning. Chance of precipitation is 60%.
Tuesday Night
A slight chance of showers before 10pm, then a slight chance of showers and thunderstorms between 10pm and 1am. Mostly cloudy, with a low around 57. North northeast wind around 8 mph. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 76. Northeast wind 8 to 11 mph.
Wednesday Night
Mostly clear, with a low around 52. East northeast wind 5 to 7 mph.
Thursday
Sunny, with a high near 77. East northeast wind 6 to 8 mph.
Thursday Night
Mostly clear, with a low around 51. East wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 81. Calm wind becoming south 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 54. East southeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 81. Southeast wind 3 to 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N Saint Johns IL
 38.06°N 89.24°W
Last Update:
8:32 am CDT Oct 5, 2025
Forecast Valid:
8am CDT Oct 5, 2025-6pm CDT Oct 11, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation