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.

Partly Cloudy

66°F

19°C

Humidity 90%
Wind Speed SW 9 mph
Barometer 29.92 in (1013.1 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 10 Mar 2:52 am CDT
Extended Forecast for

Anna IL

  • Overnight

    Overnight: Cloudy, with a low around 62. South southwest wind around 10 mph, with gusts as high as 18 mph.

    Low: 62 °F

    Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 78. South southwest wind 9 to 15 mph, with gusts as high as 25 mph.

    High: 78 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms, mainly after midnight. Cloudy, with a low around 65. South southwest wind around 16 mph, with gusts as high as 26 mph.

    Low: 65 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm before 4pm, then showers likely. High near 71. Southwest wind 15 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 100%.

    High: 71 °F

    Showers
    Likely then
    Showers

  • Wednesday Night

    Wednesday Night: Showers likely, mainly before 7pm. Mostly cloudy, with a low around 36. Breezy, with a north wind 10 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 60%.

    Low: 36 °F

    Showers
    Likely and
    Breezy then
    Slight Chance
    Showers

  • Thursday

    Thursday: Sunny, with a high near 54. North wind around 7 mph becoming west in the afternoon.

    High: 54 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 41. South wind 6 to 15 mph, with gusts as high as 25 mph.

    Low: 41 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 64. South southwest wind 9 to 15 mph, with gusts as high as 25 mph.

    High: 64 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 42. South southwest wind around 6 mph becoming northeast in the evening.

    Low: 42 °F

    Mostly Clear

Detailed Forecast

Overnight
Cloudy, with a low around 62. South southwest wind around 10 mph, with gusts as high as 18 mph.
Tuesday
Mostly cloudy, with a high near 78. South southwest wind 9 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms, mainly after midnight. Cloudy, with a low around 65. South southwest wind around 16 mph, with gusts as high as 26 mph.
Wednesday
Showers and possibly a thunderstorm before 4pm, then showers likely. High near 71. Southwest wind 15 to 18 mph becoming northwest in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 100%.
Wednesday Night
Showers likely, mainly before 7pm. Mostly cloudy, with a low around 36. Breezy, with a north wind 10 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 60%.
Thursday
Sunny, with a high near 54. North wind around 7 mph becoming west in the afternoon.
Thursday Night
Partly cloudy, with a low around 41. South wind 6 to 15 mph, with gusts as high as 25 mph.
Friday
Partly sunny, with a high near 64. South southwest wind 9 to 15 mph, with gusts as high as 25 mph.
Friday Night
Mostly clear, with a low around 42. South southwest wind around 6 mph becoming northeast in the evening.
Saturday
Sunny, with a high near 69. East southeast wind 7 to 13 mph becoming south in the afternoon. Winds could gust as high as 22 mph.
Saturday Night
Partly cloudy, with a low around 55. South wind 10 to 14 mph, with gusts as high as 24 mph.
Sunday
Showers and thunderstorms likely. Mostly cloudy, with a high near 67. Breezy, with a south southwest wind 15 to 20 mph becoming northwest in the afternoon. Winds could gust as high as 32 mph.
Sunday Night
A chance of rain and snow showers. Mostly cloudy, with a low around 27. Northwest wind 15 to 18 mph, with gusts as high as 28 mph.
Monday
A slight chance of snow showers. Mostly sunny, with a high near 39. Northwest wind 11 to 13 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:
2:26 am CDT Mar 10, 2026
Forecast Valid:
2am CDT Mar 10, 2026-6pm CDT Mar 16, 2026
 
Forecast Discussion
 
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Additional Resources

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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