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

22°F

-6°C

Humidity 89%
Wind Speed Calm
Barometer 30.46 in (1031.8 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Last update 12 Jan 12:52 am CST
Extended Forecast for

Anna IL

  • Overnight

    Overnight: Clear, with a low around 24. South southwest wind 3 to 6 mph.

    Low: 24 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 48. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.

    High: 48 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 33. South southwest wind 6 to 8 mph.

    Low: 33 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 56. Southwest wind 8 to 14 mph, with gusts as high as 22 mph.

    High: 56 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 41. West southwest wind 6 to 10 mph, with gusts as high as 18 mph.

    Low: 41 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers. Partly sunny, with a high near 46. Northwest wind 8 to 18 mph, with gusts as high as 29 mph.

    High: 46 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 19. North northwest wind 13 to 18 mph, with gusts as high as 28 mph.

    Low: 19 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 33. North northwest wind 5 to 11 mph, with gusts as high as 21 mph.

    High: 33 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 25. South southwest wind 5 to 8 mph.

    Low: 25 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Clear, with a low around 24. South southwest wind 3 to 6 mph.
Monday
Sunny, with a high near 48. Southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Monday Night
Mostly clear, with a low around 33. South southwest wind 6 to 8 mph.
Tuesday
Mostly sunny, with a high near 56. Southwest wind 8 to 14 mph, with gusts as high as 22 mph.
Tuesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 41. West southwest wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 46. Northwest wind 8 to 18 mph, with gusts as high as 29 mph.
Wednesday Night
Mostly cloudy, with a low around 19. North northwest wind 13 to 18 mph, with gusts as high as 28 mph.
Thursday
Sunny, with a high near 33. North northwest wind 5 to 11 mph, with gusts as high as 21 mph.
Thursday Night
Mostly cloudy, with a low around 25. South southwest wind 5 to 8 mph.
Friday
Partly sunny, with a high near 43. West southwest wind 8 to 11 mph, with gusts as high as 20 mph.
Friday Night
Mostly cloudy, with a low around 25. West wind around 7 mph.
Saturday
Partly sunny, with a high near 35. West northwest wind 7 to 11 mph, with gusts as high as 18 mph.
Saturday Night
Partly cloudy, with a low around 18. Northwest wind around 7 mph.
Sunday
Sunny, with a high near 32. West wind 7 to 10 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Anna IL
 37.45°N 89.24°W
Last Update:
11:07 pm CST Jan 11, 2026
Forecast Valid:
1am CST Jan 12, 2026-6pm CST Jan 18, 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