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.

Fog/Mist

70°F

21°C

Humidity 100%
Wind Speed NE 3 mph
Barometer 30.07 in
Dewpoint 70°F (21°C)
Visibility 3.00 mi
Last update 15 Oct 3:15 am CDT
Extended Forecast for

Vienna IL

Dense Fog Advisory until October 15, 08:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory until October 15, 08:00am

    NOW until 8:00am Thu

    Dense Fog Advisory

  • Overnight

    Low: 67 °F

    Chance
    T-storms and
    Areas Dense
    Fog

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms. Areas of dense fog before 8am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 88. Light and variable wind becoming southwest 6 to 11 mph in the morning. Winds could gust as high as 21 mph.

    High: 88 °F

    Chance
    T-storms and
    Areas Dense
    Fog

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 4am, then a slight chance of showers between 4am and 5am. Increasing clouds, with a low around 52. South southwest wind 5 to 14 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 30%.

    Low: 52 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers before 7am. Mostly cloudy, with a high near 59. Northwest wind 14 to 16 mph, with gusts as high as 26 mph.

    High: 59 °F

    Chance
    Showers then
    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 42. North wind 9 to 11 mph, with gusts as high as 22 mph.

    Low: 42 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 61. North northeast wind 8 to 11 mph, with gusts as high as 18 mph.

    High: 61 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 36. Calm wind.

    Low: 36 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 66. Calm wind becoming southeast around 5 mph.

    High: 66 °F

    Sunny

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly after 4am. Areas of dense fog. Otherwise, mostly cloudy, with a low around 67. Calm wind.
Thursday
A 50 percent chance of showers and thunderstorms. Areas of dense fog before 8am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 88. Light and variable wind becoming southwest 6 to 11 mph in the morning. Winds could gust as high as 21 mph.
Thursday Night
A chance of showers and thunderstorms before 4am, then a slight chance of showers between 4am and 5am. Increasing clouds, with a low around 52. South southwest wind 5 to 14 mph becoming northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 30%.
Friday
A 30 percent chance of showers before 7am. Mostly cloudy, with a high near 59. Northwest wind 14 to 16 mph, with gusts as high as 26 mph.
Friday Night
Mostly cloudy, with a low around 42. North wind 9 to 11 mph, with gusts as high as 22 mph.
Saturday
Sunny, with a high near 61. North northeast wind 8 to 11 mph, with gusts as high as 18 mph.
Saturday Night
Clear, with a low around 36. Calm wind.
Sunday
Sunny, with a high near 66. Calm wind becoming southeast around 5 mph.
Sunday Night
Mostly clear, with a low around 40. Calm wind.
Monday
Sunny, with a high near 70. Light south southeast wind.
Monday Night
Partly cloudy, with a low around 44. Calm wind.
Tuesday
Mostly sunny, with a high near 73. Calm wind.
Tuesday Night
Mostly clear, with a low around 46. Calm wind.
Wednesday
Sunny, with a high near 77. Calm wind.
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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:
1:26 am CDT Oct 15, 2026
Forecast Valid:
3am CDT Oct 15, 2026-6pm CDT Oct 21, 2026
 
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Additional Resources

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High Temperature

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Chance of Precipitation