National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

73°F

23°C

Humidity 72%
Wind Speed SE 5 mph
Barometer 30.03 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 26 Aug 12:15 am CDT
Extended Forecast for

Vienna IL

  • Overnight

    Overnight: Partly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers before 11am, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 90. Light and variable wind. Chance of precipitation is 30%.

    High: 90 °F

    Chance
    Showers then
    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Calm wind. Chance of precipitation is 40%.

    Low: 68 °F

    Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers before 7am, then a slight chance of showers after 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 88. Calm wind becoming north 5 to 7 mph in the afternoon. Chance of precipitation is 20%.

    High: 88 °F

    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88. Calm wind becoming north northeast around 6 mph in the afternoon.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 62. Calm wind.

    Low: 62 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 88. Calm wind.

    High: 88 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 65. Calm wind.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Overnight
Partly cloudy, with a low around 66. Calm wind.
Wednesday
A chance of showers before 11am, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 90. Light and variable wind. Chance of precipitation is 30%.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Calm wind. Chance of precipitation is 40%.
Thursday
A slight chance of showers before 7am, then a slight chance of showers after 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 88. Calm wind becoming north 5 to 7 mph in the afternoon. Chance of precipitation is 20%.
Thursday Night
Mostly clear, with a low around 65. Calm wind.
Friday
Sunny, with a high near 88. Calm wind becoming north northeast around 6 mph in the afternoon.
Friday Night
Clear, with a low around 62. Calm wind.
Saturday
Sunny, with a high near 88. Calm wind.
Saturday Night
Mostly clear, with a low around 65. Calm wind.
Sunday
Sunny, with a high near 92. Calm wind becoming south southwest around 6 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 70. Calm wind.
Monday
Sunny, with a high near 94. Calm wind becoming south southwest 5 to 7 mph in the morning.
Monday Night
Mostly clear, with a low around 72. Calm wind.
Tuesday
Mostly sunny, with a high near 93. Calm wind becoming west southwest around 6 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Vienna IL
 37.42°N 88.91°W
Last Update:
8:36 pm CDT Aug 25, 2026
Forecast Valid:
12am CDT Aug 26, 2026-6pm CDT Sep 1, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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