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

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Mostly Cloudy

66°F

19°C

Humidity 83%
Wind Speed Calm
Barometer 30.04 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 20 Sep 12:55 am CDT
Extended Forecast for

Vienna IL

  • Overnight

    Overnight: A 20 percent chance of showers after 4am. Patchy fog after 3am. Otherwise, partly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Slight Chance
    Showers and
    Patchy Fog

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 3pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 89. Light and variable wind.

    High: 89 °F

    Patchy Fog
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 85. Calm wind becoming south southwest 5 to 7 mph in the morning. Chance of precipitation is 50%.

    High: 85 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 70%.

    Low: 65 °F

    Chance
    Showers then
    Showers
    Likely

  • Monday

    Monday: Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 83. Calm wind becoming south southwest 5 to 8 mph in the morning. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Light south wind.

    Low: 66 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Calm wind becoming south southwest around 6 mph in the morning.

    High: 81 °F

    Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Chance
    Showers

Detailed Forecast

Overnight
A 20 percent chance of showers after 4am. Patchy fog after 3am. Otherwise, partly cloudy, with a low around 63. Calm wind.
Saturday
A 20 percent chance of showers and thunderstorms after 3pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 89. Light and variable wind.
Saturday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 66. Calm wind.
Sunday
A chance of showers and thunderstorms before 10am, then a chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 85. Calm wind becoming south southwest 5 to 7 mph in the morning. Chance of precipitation is 50%.
Sunday Night
A chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 65. Calm wind. Chance of precipitation is 70%.
Monday
Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 83. Calm wind becoming south southwest 5 to 8 mph in the morning. Chance of precipitation is 60%.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Light south wind.
Tuesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Calm wind becoming south southwest around 6 mph in the morning.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. Calm wind.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 80. East southeast wind 3 to 7 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. East northeast wind around 5 mph becoming calm in the evening.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 77. Northeast wind 5 to 7 mph becoming west northwest in the morning.
Thursday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 59. Light and variable wind.
Friday
A chance of showers. Mostly sunny, with a high near 77. Calm wind becoming west around 6 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Vienna IL
 37.42°N 88.88°W
Last Update:
12:32 am CDT Sep 20, 2025
Forecast Valid:
1am CDT Sep 20, 2025-6pm CDT Sep 26, 2025
 
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