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

42°F

6°C

Humidity 60%
Wind Speed Calm
Barometer 30.02 in (1016.6 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 16 Nov 6:52 pm CST
Extended Forecast for

Anna IL

  • Tonight

    Tonight: Clear, with a low around 36. Light and variable wind.

    Low: 36 °F

    Clear

  • Monday

    Monday: A 20 percent chance of showers after 5pm. Sunny, with a high near 59. Light east northeast wind becoming east southeast 5 to 9 mph in the morning.

    High: 59 °F

    Sunny then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 50. Southeast wind 6 to 10 mph. Chance of precipitation is 70%.

    Low: 50 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers likely and possibly a thunderstorm before noon, then a slight chance of showers and thunderstorms between noon and 3pm, then a slight chance of showers after 3pm. Partly sunny, with a high near 71. South southwest wind 8 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

    High: 71 °F

    Showers
    Likely then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 40 percent chance of showers, mainly before midnight. Mostly cloudy, with a low around 53. South southwest wind 5 to 7 mph becoming light and variable after midnight.

    Low: 53 °F

    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 70. West wind 3 to 6 mph.

    High: 70 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 56. Calm wind becoming southeast around 5 mph after midnight. Chance of precipitation is 60%.

    Low: 56 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm before noon, then showers likely. Mostly cloudy, with a high near 69. South wind 6 to 9 mph.

    High: 69 °F

    Showers

  • Thursday Night

    Thursday Night: Showers. Mostly cloudy, with a low around 57. South wind 7 to 10 mph.

    Low: 57 °F

    Showers

Detailed Forecast

Tonight
Clear, with a low around 36. Light and variable wind.
Monday
A 20 percent chance of showers after 5pm. Sunny, with a high near 59. Light east northeast wind becoming east southeast 5 to 9 mph in the morning.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 50. Southeast wind 6 to 10 mph. Chance of precipitation is 70%.
Tuesday
Showers likely and possibly a thunderstorm before noon, then a slight chance of showers and thunderstorms between noon and 3pm, then a slight chance of showers after 3pm. Partly sunny, with a high near 71. South southwest wind 8 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Tuesday Night
A 40 percent chance of showers, mainly before midnight. Mostly cloudy, with a low around 53. South southwest wind 5 to 7 mph becoming light and variable after midnight.
Wednesday
A 20 percent chance of showers and thunderstorms after noon. Mostly cloudy, with a high near 70. West wind 3 to 6 mph.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 56. Calm wind becoming southeast around 5 mph after midnight. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm before noon, then showers likely. Mostly cloudy, with a high near 69. South wind 6 to 9 mph.
Thursday Night
Showers. Mostly cloudy, with a low around 57. South wind 7 to 10 mph.
Friday
Showers likely, mainly before noon. Partly sunny, with a high near 68. South southwest wind 9 to 11 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers. Partly cloudy, with a low around 47. South southwest wind 6 to 8 mph becoming west after midnight.
Saturday
A slight chance of showers. Partly sunny, with a high near 58. West wind 5 to 8 mph.
Saturday Night
A slight chance of showers. Partly cloudy, with a low around 41. Light west northwest wind.
Sunday
A slight chance of showers. Mostly sunny, with a high near 58. Light and variable wind becoming west southwest 5 to 7 mph in the morning.
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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:
7:21 pm CST Nov 16, 2025
Forecast Valid:
7pm CST Nov 16, 2025-6pm CST Nov 23, 2025
 
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