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

66°F

19°C

Humidity 70%
Wind Speed SW 12 mph
Barometer 29.88 in (1011.7 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 15 Nov 2:52 am CST
Extended Forecast for

Anna IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 59. South southwest wind around 10 mph, with gusts as high as 18 mph.

    Low: 59 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 74. Southwest wind 10 to 15 mph, with gusts as high as 24 mph.

    High: 74 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming clear, with a low around 46. West southwest wind 6 to 8 mph becoming north after midnight.

    Low: 46 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 60. North wind 3 to 8 mph.

    High: 60 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 37. Calm wind.

    Low: 37 °F

    Clear

  • Monday

    Monday: A 20 percent chance of showers after noon. Mostly sunny, with a high near 59. Calm wind becoming southeast 5 to 7 mph in the morning.

    High: 59 °F

    Sunny then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: Showers likely, with thunderstorms also possible after 9pm. Mostly cloudy, with a low around 49. Southeast wind 7 to 9 mph. Chance of precipitation is 70%.

    Low: 49 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers and thunderstorms before noon. Partly sunny, with a high near 72. South wind 8 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph.

    High: 72 °F

    Chance
    Showers then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers. Partly cloudy, with a low around 49. Northwest wind 5 to 7 mph.

    Low: 49 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
Mostly cloudy, with a low around 59. South southwest wind around 10 mph, with gusts as high as 18 mph.
Saturday
Mostly sunny, with a high near 74. Southwest wind 10 to 15 mph, with gusts as high as 24 mph.
Saturday Night
Mostly cloudy, then gradually becoming clear, with a low around 46. West southwest wind 6 to 8 mph becoming north after midnight.
Sunday
Sunny, with a high near 60. North wind 3 to 8 mph.
Sunday Night
Clear, with a low around 37. Calm wind.
Monday
A 20 percent chance of showers after noon. Mostly sunny, with a high near 59. Calm wind becoming southeast 5 to 7 mph in the morning.
Monday Night
Showers likely, with thunderstorms also possible after 9pm. Mostly cloudy, with a low around 49. Southeast wind 7 to 9 mph. Chance of precipitation is 70%.
Tuesday
A chance of showers and thunderstorms before noon. Partly sunny, with a high near 72. South wind 8 to 11 mph becoming west northwest in the afternoon. Winds could gust as high as 21 mph.
Tuesday Night
A slight chance of showers. Partly cloudy, with a low around 49. Northwest wind 5 to 7 mph.
Wednesday
A chance of showers. Partly sunny, with a high near 65. North northeast wind 5 to 7 mph becoming south in the afternoon.
Wednesday Night
Showers likely. Mostly cloudy, with a low around 52. East southeast wind around 6 mph.
Thursday
Showers and possibly a thunderstorm. Mostly cloudy, with a high near 66. South wind 6 to 11 mph, with gusts as high as 20 mph.
Thursday Night
Showers likely. Mostly cloudy, with a low around 54. South southeast wind 8 to 10 mph.
Friday
A chance of showers. Mostly cloudy, with a high near 66. South southwest wind around 11 mph, with gusts as high as 20 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:
2:11 am CST Nov 15, 2025
Forecast Valid:
3am CST Nov 15, 2025-6pm CST Nov 21, 2025
 
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