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.

Partly Cloudy

79°F

26°C

Humidity 61%
Wind Speed S 6 mph
Barometer 29.92 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 16 May 5:47 pm CDT
Extended Forecast for

4 Miles ESE Marion IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 68. South southwest wind 6 to 10 mph becoming southeast in the evening. Winds could gust as high as 20 mph.

    Low: 68 °F

    Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 88. South wind 8 to 16 mph, with gusts as high as 24 mph.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 69. South wind 9 to 11 mph, with gusts as high as 21 mph.

    Low: 69 °F

    Increasing
    Clouds

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Increasing clouds, with a high near 89. South wind 13 to 17 mph, with gusts as high as 28 mph.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 72. South wind 11 to 13 mph, with gusts as high as 23 mph.

    Low: 72 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 88. South southwest wind 13 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.

    High: 88 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 65. South southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

    Low: 65 °F

    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 77. North wind 6 to 9 mph.

    High: 77 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 56. North northeast wind 6 to 9 mph.

    Low: 56 °F

    Chance
    Showers

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly before 7pm. Partly cloudy, with a low around 68. South southwest wind 6 to 10 mph becoming southeast in the evening. Winds could gust as high as 20 mph.
Sunday
Sunny, with a high near 88. South wind 8 to 16 mph, with gusts as high as 24 mph.
Sunday Night
Increasing clouds, with a low around 69. South wind 9 to 11 mph, with gusts as high as 21 mph.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Increasing clouds, with a high near 89. South wind 13 to 17 mph, with gusts as high as 28 mph.
Monday Night
Partly cloudy, with a low around 72. South wind 11 to 13 mph, with gusts as high as 23 mph.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 88. South southwest wind 13 to 17 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.
Tuesday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 65. South southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Wednesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 77. North wind 6 to 9 mph.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 56. North northeast wind 6 to 9 mph.
Thursday
A slight chance of showers. Partly sunny, with a high near 73. North northeast wind around 9 mph.
Thursday Night
A slight chance of showers. Mostly cloudy, with a low around 56. Northeast wind 5 to 8 mph.
Friday
A chance of showers. Partly sunny, with a high near 77. Northeast wind around 7 mph.
Friday Night
A slight chance of showers. Mostly cloudy, with a low around 59. Northeast wind around 6 mph becoming calm in the evening.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 82. East northeast wind 3 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles ESE Marion IL
 37.71°N 88.86°W
Last Update:
6:26 pm CDT May 16, 2026
Forecast Valid:
6pm CDT May 16, 2026-6pm CDT May 23, 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