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

47°F

8°C

Humidity 50%
Wind Speed SE 6 mph
Barometer 30.32 in (1026.8 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 29 Mar 2:52 am CDT
Extended Forecast for

Anna IL

  • Overnight

    Overnight: Partly cloudy, with a low around 38. South southeast wind around 5 mph.

    Low: 38 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 69. South southwest wind 5 to 14 mph, with gusts as high as 23 mph.

    High: 69 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 56. South wind around 10 mph, with gusts as high as 20 mph.

    Low: 56 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 78. Breezy, with a south southwest wind 11 to 20 mph, with gusts as high as 31 mph.

    High: 78 °F

    Mostly Sunny
    then Mostly
    Sunny and
    Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 64. South wind around 15 mph, with gusts as high as 25 mph.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. Breezy, with a south southwest wind 14 to 20 mph, with gusts as high as 34 mph.

    High: 82 °F

    Mostly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: A slight chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 56. South southwest wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    Low: 56 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. Mostly cloudy, with a high near 69. West northwest wind around 11 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph.

    High: 69 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Cloudy, with a low around 55. Northeast wind 8 to 10 mph becoming southeast after midnight.

    Low: 55 °F

    Showers
    Likely

Detailed Forecast

Overnight
Partly cloudy, with a low around 38. South southeast wind around 5 mph.
Sunday
Mostly sunny, with a high near 69. South southwest wind 5 to 14 mph, with gusts as high as 23 mph.
Sunday Night
Partly cloudy, with a low around 56. South wind around 10 mph, with gusts as high as 20 mph.
Monday
Mostly sunny, with a high near 78. Breezy, with a south southwest wind 11 to 20 mph, with gusts as high as 31 mph.
Monday Night
Mostly clear, with a low around 64. South wind around 15 mph, with gusts as high as 25 mph.
Tuesday
Mostly sunny, with a high near 82. Breezy, with a south southwest wind 14 to 20 mph, with gusts as high as 34 mph.
Tuesday Night
A slight chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 56. South southwest wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 69. West northwest wind around 11 mph becoming north northeast in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Showers likely and possibly a thunderstorm. Cloudy, with a low around 55. Northeast wind 8 to 10 mph becoming southeast after midnight.
Thursday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 68. South southeast wind 8 to 10 mph becoming southwest in the afternoon. Winds could gust as high as 18 mph.
Thursday Night
Showers likely. Mostly cloudy, with a low around 53. South wind around 9 mph.
Friday
A chance of showers. Mostly cloudy, with a high near 75. South wind around 9 mph.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. South wind around 8 mph.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 71. South wind 11 to 14 mph, with gusts as high as 22 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:
1:26 am CDT Mar 29, 2026
Forecast Valid:
3am CDT Mar 29, 2026-6pm CDT Apr 4, 2026
 
Forecast Discussion
 
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Additional Resources

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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