Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Overcast

84°F

29°C

Humidity 79%
Wind Speed S 7 mph
Barometer 29.99 in
Dewpoint 77°F (25°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 25 Jul 2:45 pm CDT
Extended Forecast for

Vienna IL

Heat Advisory July 26, 11:00am until July 28, 07:00pm
Click here for hazard details and duration
Heat Advisory
  • This Afternoon

    This Afternoon: A 20 percent chance of showers and thunderstorms.  Mostly sunny, with a high near 85. Southwest wind around 5 mph.

    High: 85 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Patchy fog after 2am.  Otherwise, increasing clouds, with a low around 73. Calm wind.

    Low: 73 °F

    Partly Cloudy
    then Patchy
    Fog

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 4pm.  Patchy fog before 8am.  Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 107. Calm wind.

    High: 93 °F

    Patchy Fog
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A 10 percent chance of showers and thunderstorms before 7pm.  Mostly clear, with a low around 74. Calm wind.

    Low: 74 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 96. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 96 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 78. South southwest wind 3 to 6 mph.

    Low: 78 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Northwest wind 3 to 8 mph.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 71. North northeast wind 3 to 5 mph.

    Low: 71 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 90. North northeast wind 3 to 7 mph.

    High: 90 °F

    Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 85. Southwest wind around 5 mph.
Tonight
Patchy fog after 2am. Otherwise, increasing clouds, with a low around 73. Calm wind.
Sunday
A 20 percent chance of showers and thunderstorms after 4pm. Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 93. Heat index values as high as 107. Calm wind.
Sunday Night
A 10 percent chance of showers and thunderstorms before 7pm. Mostly clear, with a low around 74. Calm wind.
Monday
Mostly sunny, with a high near 96. Calm wind becoming southwest 5 to 7 mph in the morning.
Monday Night
Mostly clear, with a low around 78. South southwest wind 3 to 6 mph.
Tuesday
Sunny, with a high near 95. Northwest wind 3 to 8 mph.
Tuesday Night
Partly cloudy, with a low around 71. North northeast wind 3 to 5 mph.
Wednesday
Sunny, with a high near 90. North northeast wind 3 to 7 mph.
Wednesday Night
Mostly clear, with a low around 68. Light north northeast wind.
Thursday
Sunny, with a high near 89. Calm wind becoming northeast around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 68. Calm wind.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Calm wind becoming west southwest around 5 mph in the afternoon.
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ABOUT THIS FORECAST

 
Point Forecast:
Vienna IL
 37.42°N 88.88°W
2:26 pm CDT Jul 25, 2026
3pm CDT Jul 25, 2026-6pm CDT Jul 31, 2026
 
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Additional Resources

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