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

64°F

18°C

Humidity 78%
Wind Speed Calm
Barometer 29.88 in (1011.6 mb)
Dewpoint 57°F (14°C)
Visibility 9.00 mi
Last update 21 Mar 9:52 am CDT
Extended Forecast for

Anna IL

  • Today

    Today: Sunny, with a high near 84. West southwest wind 5 to 7 mph.

    High: 84 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 61. South southwest wind 6 to 9 mph.

    Low: 61 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 83. South southwest wind 9 to 17 mph, with gusts as high as 26 mph.

    High: 83 °F

    Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 40. West wind 11 to 18 mph becoming north after midnight. Winds could gust as high as 28 mph.

    Low: 40 °F

    Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 58. North northeast wind 10 to 13 mph, with gusts as high as 22 mph.

    High: 58 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 42. Northeast wind around 7 mph.

    Low: 42 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 60. South southeast wind around 6 mph.

    High: 60 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers after 1am. Mostly cloudy, with a low around 46. Southeast wind 3 to 5 mph.

    Low: 46 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 71. South wind 5 to 8 mph.

    High: 71 °F

    Slight Chance
    T-storms

Detailed Forecast

Today
Sunny, with a high near 84. West southwest wind 5 to 7 mph.
Tonight
Clear, with a low around 61. South southwest wind 6 to 9 mph.
Sunday
Sunny, with a high near 83. South southwest wind 9 to 17 mph, with gusts as high as 26 mph.
Sunday Night
A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 40. West wind 11 to 18 mph becoming north after midnight. Winds could gust as high as 28 mph.
Monday
Mostly sunny, with a high near 58. North northeast wind 10 to 13 mph, with gusts as high as 22 mph.
Monday Night
Mostly cloudy, with a low around 42. Northeast wind around 7 mph.
Tuesday
Partly sunny, with a high near 60. South southeast wind around 6 mph.
Tuesday Night
A slight chance of showers after 1am. Mostly cloudy, with a low around 46. Southeast wind 3 to 5 mph.
Wednesday
A slight chance of showers and thunderstorms before 1pm. Partly sunny, with a high near 71. South wind 5 to 8 mph.
Wednesday Night
A slight chance of showers. Partly cloudy, with a low around 56. South wind 6 to 8 mph.
Thursday
A slight chance of showers and thunderstorms. Sunny, with a high near 81. Southwest wind 8 to 13 mph, with gusts as high as 21 mph.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 50. Southwest wind around 11 mph becoming north after midnight. Winds could gust as high as 20 mph.
Friday
A chance of showers. Partly sunny, with a high near 63. North northeast wind around 11 mph, with gusts as high as 21 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Anna IL
 37.45°N 89.24°W
Last Update:
6:36 am CDT Mar 21, 2026
Forecast Valid:
10am CDT Mar 21, 2026-6pm CDT Mar 27, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation