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.

A Few Clouds

37°F

3°C

Humidity 67%
Wind Speed E 3 mph
Barometer 30.07 in (1018.3 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 21 Feb 1:52 am CST
Extended Forecast for

Anna IL

  • Overnight

    Overnight: A chance of sprinkles before 3am, then a chance of showers between 3am and 5am. Mostly cloudy, with a low around 33. Calm wind becoming northeast around 6 mph. Chance of precipitation is 30%.

    Low: 33 °F

    Chance
    Showers

  • Saturday

    Saturday: A chance of snow showers before 1pm, then a chance of sprinkles between 1pm and 2pm. Mostly cloudy, with a high near 41. North wind 6 to 9 mph. Chance of precipitation is 20%.

    High: 41 °F

    Slight Chance
    Snow Showers
    then Slight
    Chance
    Sprinkles/Snow

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 24. Northwest wind 7 to 11 mph, with gusts as high as 20 mph.

    Low: 24 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 35. Northwest wind 11 to 18 mph, with gusts as high as 29 mph.

    High: 35 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 16. North northwest wind around 14 mph, with gusts as high as 23 mph.

    Low: 16 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 32. North northwest wind 7 to 14 mph, with gusts as high as 22 mph.

    High: 32 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 17. North northwest wind around 6 mph becoming calm in the evening.

    Low: 17 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 47. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.

    High: 47 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 40. South southwest wind 11 to 13 mph, with gusts as high as 22 mph.

    Low: 40 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A chance of sprinkles before 3am, then a chance of showers between 3am and 5am. Mostly cloudy, with a low around 33. Calm wind becoming northeast around 6 mph. Chance of precipitation is 30%.
Saturday
A chance of snow showers before 1pm, then a chance of sprinkles between 1pm and 2pm. Mostly cloudy, with a high near 41. North wind 6 to 9 mph. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 24. Northwest wind 7 to 11 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 35. Northwest wind 11 to 18 mph, with gusts as high as 29 mph.
Sunday Night
Mostly clear, with a low around 16. North northwest wind around 14 mph, with gusts as high as 23 mph.
Monday
Sunny, with a high near 32. North northwest wind 7 to 14 mph, with gusts as high as 22 mph.
Monday Night
Mostly clear, with a low around 17. North northwest wind around 6 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 47. South southwest wind 5 to 15 mph, with gusts as high as 25 mph.
Tuesday Night
Mostly cloudy, with a low around 40. South southwest wind 11 to 13 mph, with gusts as high as 22 mph.
Wednesday
Mostly cloudy, with a high near 60. South southwest wind 11 to 15 mph, with gusts as high as 24 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 41. South southwest wind 8 to 10 mph becoming north northwest after midnight.
Thursday
A chance of showers. Partly sunny, with a high near 53. North northwest wind 7 to 9 mph.
Thursday Night
A slight chance of showers. Mostly clear, with a low around 31. North northwest wind around 6 mph becoming southwest after midnight.
Friday
Sunny, with a high near 57. South southwest wind 5 to 8 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:
1:31 am CST Feb 21, 2026
Forecast Valid:
1am CST Feb 21, 2026-6pm CST Feb 27, 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