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.

Mostly Cloudy

81°F

27°C

Humidity 74%
Wind Speed N 9 mph
Barometer 30.12 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 12 Jul 11:52 am CDT
Extended Forecast for

Altenburg MO

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 85. North northeast wind around 9 mph.

    High: 85 °F

    Mostly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 68. North wind 3 to 7 mph.

    Low: 68 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 86. North northeast wind 5 to 9 mph.

    High: 86 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 68. North northeast wind 3 to 6 mph.

    Low: 68 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 88. Northeast wind 3 to 8 mph.

    High: 88 °F

    Sunny then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 70. East northeast wind around 5 mph becoming calm in the evening.

    Low: 70 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Light and variable wind.

    High: 89 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 72. Calm wind.

    Low: 72 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 91. Calm wind.

    High: 91 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 85. North northeast wind around 9 mph.
Tonight
Mostly clear, with a low around 68. North wind 3 to 7 mph.
Monday
Sunny, with a high near 86. North northeast wind 5 to 9 mph.
Monday Night
Mostly clear, with a low around 68. North northeast wind 3 to 6 mph.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 88. Northeast wind 3 to 8 mph.
Tuesday Night
Mostly clear, with a low around 70. East northeast wind around 5 mph becoming calm in the evening.
Wednesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Light and variable wind.
Wednesday Night
Mostly clear, with a low around 72. Calm wind.
Thursday
Sunny, with a high near 91. Calm wind.
Thursday Night
Mostly clear, with a low around 73. Calm wind.
Friday
Sunny, with a high near 92. Light west wind.
Friday Night
Mostly clear, with a low around 74. Southwest wind 3 to 5 mph.
Saturday
Sunny, with a high near 94. West southwest wind 3 to 6 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Altenburg MO
 37.62°N 89.57°W
Last Update:
10:36 am CDT Jul 12, 2026
Forecast Valid:
12pm CDT Jul 12, 2026-6pm CDT Jul 18, 2026
 
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