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.

Partly Cloudy

80°F

27°C

Humidity 47%
Wind Speed Vrbl 6 mph
Barometer 30.02 in (1016.3 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 19 Jun 11:52 am CDT
Extended Forecast for

Altenburg MO

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 84. Calm wind.

    High: 84 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 86. Light southwest wind.

    High: 86 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 67. Light and variable wind.

    Low: 67 °F

    Partly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 85. South southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

    High: 85 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm. Low around 69. South southwest wind 11 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.

    Low: 69 °F

    Showers

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 81. Northwest wind around 9 mph.

    High: 81 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. North wind 5 to 9 mph becoming calm in the evening.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 81. Light north northeast wind.

    High: 81 °F

    Mostly Sunny

Detailed Forecast

Juneteenth
Mostly sunny, with a high near 84. Calm wind.
Tonight
Mostly cloudy, with a low around 63. Calm wind.
Saturday
Mostly sunny, with a high near 86. Light southwest wind.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 67. Light and variable wind.
Sunday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 85. South southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Sunday Night
Showers and possibly a thunderstorm. Low around 69. South southwest wind 11 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.
Monday
A 40 percent chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 81. Northwest wind around 9 mph.
Monday Night
Partly cloudy, with a low around 63. North wind 5 to 9 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 81. Light north northeast wind.
Tuesday Night
A slight chance of showers after 1am. Partly cloudy, with a low around 63. Light north wind.
Wednesday
Mostly sunny, with a high near 83. Light west northwest wind.
Wednesday Night
Mostly clear, with a low around 63. Light northwest wind.
Thursday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. Calm wind becoming west southwest around 5 mph in the afternoon.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Altenburg MO
 37.62°N 89.57°W
Last Update:
11:11 am CDT Jun 19, 2026
Forecast Valid:
12pm CDT Jun 19, 2026-6pm CDT Jun 25, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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