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.

Mostly Cloudy

61°F

16°C

Humidity 42%
Wind Speed SE 7 mph
Barometer 29.99 in
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Last update 28 Feb 6:52 pm CST
Extended Forecast for

Anna IL

  • Tonight

    Tonight: Scattered showers, mainly before 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 36. East wind 5 to 11 mph becoming west southwest in the evening. Winds could gust as high as 18 mph. Chance of precipitation is 30%.

    Low: 36 °F

    Scattered
    Showers then
    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 50. North northeast wind 10 to 13 mph, with gusts as high as 20 mph.

    High: 50 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Showers likely, mainly after midnight. Cloudy, with a low around 36. East northeast wind around 9 mph. Chance of precipitation is 70%.

    Low: 36 °F

    Showers
    Likely

  • Monday

    Monday: Showers likely, mainly before noon. Cloudy, with a high near 49. East wind 6 to 8 mph. Chance of precipitation is 60%.

    High: 49 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 44. East wind 6 to 9 mph becoming south after midnight.

    Low: 44 °F

    Chance
    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers, mainly before noon. Mostly cloudy, with a high near 70. South southwest wind 10 to 17 mph, with gusts as high as 28 mph.

    High: 70 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers. Mostly cloudy, with a low around 57. South wind 7 to 10 mph.

    Low: 57 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Showers likely, with thunderstorms also possible after noon. Cloudy, with a high near 70. South southwest wind 9 to 11 mph, with gusts as high as 20 mph.

    High: 70 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 58. South southwest wind around 9 mph.

    Low: 58 °F

    Showers
    Likely

Detailed Forecast

Tonight
Scattered showers, mainly before 9pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 36. East wind 5 to 11 mph becoming west southwest in the evening. Winds could gust as high as 18 mph. Chance of precipitation is 30%.
Sunday
Partly sunny, with a high near 50. North northeast wind 10 to 13 mph, with gusts as high as 20 mph.
Sunday Night
Showers likely, mainly after midnight. Cloudy, with a low around 36. East northeast wind around 9 mph. Chance of precipitation is 70%.
Monday
Showers likely, mainly before noon. Cloudy, with a high near 49. East wind 6 to 8 mph. Chance of precipitation is 60%.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 44. East wind 6 to 9 mph becoming south after midnight.
Tuesday
A 30 percent chance of showers, mainly before noon. Mostly cloudy, with a high near 70. South southwest wind 10 to 17 mph, with gusts as high as 28 mph.
Tuesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 57. South wind 7 to 10 mph.
Wednesday
Showers likely, with thunderstorms also possible after noon. Cloudy, with a high near 70. South southwest wind 9 to 11 mph, with gusts as high as 20 mph.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 58. South southwest wind around 9 mph.
Thursday
Showers likely, with thunderstorms also possible after noon. Mostly cloudy, with a high near 71. South southwest wind 9 to 13 mph, with gusts as high as 21 mph.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. South wind 7 to 9 mph.
Friday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 73. South southwest wind 8 to 13 mph, with gusts as high as 22 mph.
Friday Night
Showers likely. Mostly cloudy, with a low around 57. South southwest wind 8 to 10 mph, with gusts as high as 20 mph.
Saturday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 66. Southwest wind 9 to 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:
7:01 pm CST Feb 28, 2026
Forecast Valid:
7pm CST Feb 28, 2026-6pm CST Mar 7, 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