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

69°F

21°C

Humidity 84%
Wind Speed SW 10 mph
Barometer 29.99 in (1015.2 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 5 Mar 4:52 pm CST
Extended Forecast for

Anna IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 69. Southwest wind around 7 mph.

    High: 69 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 4am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 59. South wind around 6 mph. Chance of precipitation is 40%.

    Low: 59 °F

    Chance
    T-storms

  • Friday

    Friday: Partly sunny, with a high near 76. South wind 7 to 16 mph, with gusts as high as 26 mph.

    High: 76 °F

    Partly Sunny

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 63. South wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    Low: 63 °F

    Mostly Cloudy
    then Showers
    Likely

  • Saturday

    Saturday: Showers and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. High near 72. South southwest wind 9 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%.

    High: 72 °F

    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 43. North northwest wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 30%.

    Low: 43 °F

    Chance
    Showers then
    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 64. Calm wind becoming west around 5 mph.

    High: 64 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 49. South southwest wind 3 to 6 mph.

    Low: 49 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of showers after noon. Mostly sunny, with a high near 74. South southwest wind 6 to 13 mph, with gusts as high as 21 mph.

    High: 74 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 69. Southwest wind around 7 mph.
Tonight
A chance of showers and thunderstorms before 4am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 59. South wind around 6 mph. Chance of precipitation is 40%.
Friday
Partly sunny, with a high near 76. South wind 7 to 16 mph, with gusts as high as 26 mph.
Friday Night
Showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 63. South wind 10 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Saturday
Showers and possibly a thunderstorm before noon, then a chance of showers and thunderstorms after noon. High near 72. South southwest wind 9 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%.
Saturday Night
A chance of showers and thunderstorms before 9pm, then a chance of showers between 9pm and midnight. Mostly cloudy, with a low around 43. North northwest wind 5 to 8 mph becoming calm after midnight. Chance of precipitation is 30%.
Sunday
Mostly sunny, with a high near 64. Calm wind becoming west around 5 mph.
Sunday Night
Mostly clear, with a low around 49. South southwest wind 3 to 6 mph.
Monday
A slight chance of showers after noon. Mostly sunny, with a high near 74. South southwest wind 6 to 13 mph, with gusts as high as 21 mph.
Monday Night
A chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 61. South southwest wind around 9 mph.
Tuesday
Showers and thunderstorms likely. Mostly cloudy, with a high near 76. South southwest wind 8 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 61. South southwest wind around 14 mph, with gusts as high as 23 mph.
Wednesday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 70. South southwest wind 13 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 24 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 40. North wind 8 to 13 mph, with gusts as high as 21 mph.
Thursday
Mostly sunny, with a high near 55. North wind 7 to 9 mph becoming east in the afternoon.
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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:
1:46 pm CST Mar 5, 2026
Forecast Valid:
5pm CST Mar 5, 2026-6pm CDT Mar 12, 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