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.

A Few Clouds

53°F

12°C

Humidity 86%
Wind Speed NE 7 mph
Barometer 30.32 in (1026.5 mb)
Dewpoint 49°F (9°C)
Visibility 8.00 mi
Wind Chill51°F (11°C)
Last update 11 Apr 3:52 am CDT
Extended Forecast for

2 Miles N Saint Johns IL

  • Today

    Today: Isolated showers and thunderstorms after 1pm. Mostly sunny, with a high near 74. East northeast wind around 6 mph becoming south southeast in the afternoon. Chance of precipitation is 20%.

    High: 74 °F

    Mostly Sunny
    then Isolated
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 59. Southeast wind around 6 mph.

    Low: 59 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 80. Breezy, with a south wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 29 mph.

    High: 80 °F

    Mostly Sunny
    then Partly
    Sunny and
    Breezy

  • Sunday Night

    Sunday Night: A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67. South southwest wind around 16 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.

    Low: 67 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. South southwest wind 14 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    High: 81 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 68. South southwest wind 11 to 15 mph, with gusts as high as 24 mph.

    Low: 68 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 85. South southwest wind 11 to 17 mph, with gusts as high as 25 mph.

    High: 85 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 69. South southwest wind 11 to 14 mph, with gusts as high as 23 mph.

    Low: 69 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms. Partly sunny, with a high near 84. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.

    High: 84 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Isolated showers and thunderstorms after 1pm. Mostly sunny, with a high near 74. East northeast wind around 6 mph becoming south southeast in the afternoon. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 59. Southeast wind around 6 mph.
Sunday
Partly sunny, with a high near 80. Breezy, with a south wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 29 mph.
Sunday Night
A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 67. South southwest wind around 16 mph, with gusts as high as 26 mph. Chance of precipitation is 50%.
Monday
A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. South southwest wind 14 to 17 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Monday Night
Mostly cloudy, with a low around 68. South southwest wind 11 to 15 mph, with gusts as high as 24 mph.
Tuesday
Mostly sunny, with a high near 85. South southwest wind 11 to 17 mph, with gusts as high as 25 mph.
Tuesday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 69. South southwest wind 11 to 14 mph, with gusts as high as 23 mph.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 84. South southwest wind 10 to 14 mph, with gusts as high as 21 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. South southwest wind 8 to 10 mph, with gusts as high as 18 mph.
Thursday
Showers and thunderstorms likely. Partly sunny, with a high near 81. South southwest wind 8 to 13 mph, with gusts as high as 20 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 61. South southwest wind 6 to 8 mph.
Friday
A chance of showers and thunderstorms. Mostly sunny, with a high near 84. South southwest wind 6 to 11 mph, with gusts as high as 18 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:
3:41 am CDT Apr 11, 2026
Forecast Valid:
4am CDT Apr 11, 2026-6pm CDT Apr 17, 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