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.

Overcast

34°F

1°C

Humidity 50%
Wind Speed SE 10 mph
Barometer 30.18 in (1022.2 mb)
Dewpoint 17°F (-8°C)
Visibility 10.00 mi
Wind Chill26°F (-3°C)
Last update 18 Mar 12:52 am CDT
Extended Forecast for

Anna IL

  • Overnight

    Overnight: A slight chance of snow showers before 3am, then a slight chance of snow showers after 5am. Mostly cloudy, with a low around 32. South wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

    Low: 32 °F

    Slight Chance
    Snow Showers

  • Wednesday

    Wednesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 60. South wind 10 to 14 mph, with gusts as high as 23 mph.

    High: 60 °F

    Becoming
    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 43. South wind around 6 mph.

    Low: 43 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly cloudy, then gradually becoming sunny, with a high near 71. South southwest wind around 7 mph.

    High: 71 °F

    Decreasing
    Clouds

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 49. Light and variable wind.

    Low: 49 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 76. Southwest wind 3 to 8 mph.

    High: 76 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 54. South southwest wind around 6 mph.

    Low: 54 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 78. West wind 5 to 7 mph.

    High: 78 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 56. South southwest wind around 7 mph.

    Low: 56 °F

    Clear

Detailed Forecast

Overnight
A slight chance of snow showers before 3am, then a slight chance of snow showers after 5am. Mostly cloudy, with a low around 32. South wind 7 to 11 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 60. South wind 10 to 14 mph, with gusts as high as 23 mph.
Wednesday Night
Increasing clouds, with a low around 43. South wind around 6 mph.
Thursday
Mostly cloudy, then gradually becoming sunny, with a high near 71. South southwest wind around 7 mph.
Thursday Night
Mostly clear, with a low around 49. Light and variable wind.
Friday
Sunny, with a high near 76. Southwest wind 3 to 8 mph.
Friday Night
Partly cloudy, with a low around 54. South southwest wind around 6 mph.
Saturday
Sunny, with a high near 78. West wind 5 to 7 mph.
Saturday Night
Clear, with a low around 56. South southwest wind around 7 mph.
Sunday
Sunny, with a high near 82. South southwest wind 8 to 14 mph, with gusts as high as 23 mph.
Sunday Night
Partly cloudy, with a low around 41. North wind around 13 mph, with gusts as high as 21 mph.
Monday
Mostly cloudy, with a high near 56. North northeast wind 11 to 13 mph, with gusts as high as 20 mph.
Monday Night
Mostly cloudy, with a low around 37. Northeast wind 6 to 8 mph.
Tuesday
A slight chance of showers. Partly sunny, with a high near 60. East wind 6 to 8 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Anna IL
 37.45°N 89.24°W
Last Update:
12:21 am CDT Mar 18, 2026
Forecast Valid:
1am CDT Mar 18, 2026-6pm CDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation