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

60°F

16°C

Humidity 62%
Wind Speed S 8 mph
Barometer 30.16 in (1021.2 mb)
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 10 Apr 12:52 am CDT
Extended Forecast for

Anna IL

  • Overnight

    Overnight: Mostly clear, with a low around 55. South wind around 8 mph.

    Low: 55 °F

    Mostly Clear

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Increasing clouds, with a high near 78. South southwest wind 7 to 10 mph becoming west in the afternoon. Winds could gust as high as 20 mph.

    High: 78 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 40 percent chance of showers and thunderstorms, mainly before 11pm. Mostly cloudy, with a low around 57. North wind around 5 mph becoming light and variable in the evening.

    Low: 57 °F

    Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 79. Northeast wind around 6 mph becoming south in the afternoon.

    High: 79 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 60. Southeast wind around 6 mph.

    Low: 60 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 81. South southwest wind 7 to 17 mph, with gusts as high as 29 mph.

    High: 81 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 66. South wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.

    Low: 66 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. South southwest wind 14 to 16 mph, with gusts as high as 26 mph.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 68. South southwest wind 11 to 13 mph, with gusts as high as 22 mph.

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 55. South wind around 8 mph.
Friday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Increasing clouds, with a high near 78. South southwest wind 7 to 10 mph becoming west in the afternoon. Winds could gust as high as 20 mph.
Friday Night
A 40 percent chance of showers and thunderstorms, mainly before 11pm. Mostly cloudy, with a low around 57. North wind around 5 mph becoming light and variable in the evening.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 79. Northeast wind around 6 mph becoming south in the afternoon.
Saturday Night
Partly cloudy, with a low around 60. Southeast wind around 6 mph.
Sunday
Partly sunny, with a high near 81. South southwest wind 7 to 17 mph, with gusts as high as 29 mph.
Sunday Night
A slight chance of showers, then a chance of showers and thunderstorms after 10pm. Mostly cloudy, with a low around 66. South wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. South southwest wind 14 to 16 mph, with gusts as high as 26 mph.
Monday Night
Partly cloudy, with a low around 68. South southwest wind 11 to 13 mph, with gusts as high as 22 mph.
Tuesday
Partly sunny, with a high near 85. South southwest wind 11 to 16 mph, with gusts as high as 26 mph.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South wind 11 to 13 mph, with gusts as high as 23 mph.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 84. South southwest wind 11 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 62. South southwest wind 7 to 10 mph.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 80. South wind 7 to 10 mph, with gusts as high as 18 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:
1:26 am CDT Apr 10, 2026
Forecast Valid:
1am CDT Apr 10, 2026-6pm CDT Apr 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Link to Local Radar Data Link to Satellite Data

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