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 70%
Wind Speed S 18 G 29 mph
Barometer 30.10 in (1019.0 mb)
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 30 Mar 5:52 am CDT
Extended Forecast for

Anna IL

  • Today

    Today: Mostly cloudy, then gradually becoming sunny, with a high near 79. South southwest wind 10 to 18 mph, with gusts as high as 32 mph.

    High: 79 °F

    Decreasing
    Clouds

  • Tonight

    Tonight: Mostly clear, with a low around 64. South southwest wind around 15 mph, with gusts as high as 28 mph.

    Low: 64 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 82. Breezy, with a south southwest wind 14 to 21 mph, with gusts as high as 33 mph.

    High: 82 °F

    Partly Sunny
    and Breezy

  • Tuesday Night

    Tuesday Night: A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 64. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 64 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 81. South southwest wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    High: 81 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 65. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.

    Low: 65 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. South wind 14 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 70%.

    High: 77 °F

    Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Mostly cloudy, with a low around 62. South wind 14 to 16 mph, with gusts as high as 26 mph.

    Low: 62 °F

    Showers

  • Friday

    Friday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 76. South wind 10 to 13 mph, with gusts as high as 20 mph.

    High: 76 °F

    Showers
    Likely

Detailed Forecast

Today
Mostly cloudy, then gradually becoming sunny, with a high near 79. South southwest wind 10 to 18 mph, with gusts as high as 32 mph.
Tonight
Mostly clear, with a low around 64. South southwest wind around 15 mph, with gusts as high as 28 mph.
Tuesday
Partly sunny, with a high near 82. Breezy, with a south southwest wind 14 to 21 mph, with gusts as high as 33 mph.
Tuesday Night
A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Partly cloudy, with a low around 64. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Wednesday
A chance of showers and thunderstorms before 7am, then a chance of showers between 7am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 81. South southwest wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Wednesday Night
A chance of showers, with thunderstorms also possible after 1am. Mostly cloudy, with a low around 65. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 40%.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. South wind 14 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 70%.
Thursday Night
Showers and possibly a thunderstorm. Mostly cloudy, with a low around 62. South wind 14 to 16 mph, with gusts as high as 26 mph.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 76. South wind 10 to 13 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 60. South wind 9 to 11 mph, with gusts as high as 18 mph.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 71. South wind 11 to 15 mph becoming west in the afternoon. Winds could gust as high as 23 mph.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 43. West northwest wind 11 to 13 mph, with gusts as high as 20 mph.
Sunday
A chance of showers. Mostly sunny, with a high near 59. Northwest wind 11 to 14 mph, with gusts as high as 21 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Anna IL
 37.45°N 89.24°W
Last Update:
5:22 am CDT Mar 30, 2026
Forecast Valid:
6am CDT Mar 30, 2026-6pm CDT Apr 5, 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