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

Excessive Rainfall and Potential Tropical Cyclone in the South; Severe Thunderstorms in the Midwest

Excessive rainfall may produce locally considerable flash flooding over parts of the northwestern Gulf Coast, lower Mississippi River Valley, and Deep South through Thursday. Potential Tropical Cyclone One is forecast to become a tropical storm (Arthur) as it moves along or just off the northwestern Gulf coast through Wednesday. An outbreak of severe weather is forecast in the Midwest Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

67°F

19°C

Humidity 87%
Wind Speed Calm
Barometer 29.78 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 16 Jun 11:35 pm CDT
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Partly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 90. Breezy, with a south southwest wind 6 to 11 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 39 mph.

    High: 90 °F

    Sunny then
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms before 4am, then a slight chance of showers. Low around 74. Breezy, with a south southwest wind 19 to 24 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 37 mph. Chance of precipitation is 80%.

    Low: 74 °F

    Chance
    T-storms and
    Breezy then
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 11am. Mostly sunny, with a high near 86. West southwest wind 6 to 8 mph becoming north northwest in the afternoon. Chance of precipitation is 40%.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 64. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 64 °F

    Chance
    Showers

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 84. Calm wind becoming north northwest 5 to 7 mph in the morning.

    High: 84 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 63. Light north wind.

    Low: 63 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 87. Calm wind becoming south around 6 mph in the afternoon.

    High: 87 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. South wind around 5 mph becoming calm in the evening.

    Low: 68 °F

    Mostly Clear
    then Chance
    Showers

Detailed Forecast

Tonight
Partly cloudy, with a low around 64. Calm wind.
Wednesday
Sunny, with a high near 90. Breezy, with a south southwest wind 6 to 11 mph increasing to 20 to 25 mph in the afternoon. Winds could gust as high as 39 mph.
Wednesday Night
Showers and thunderstorms before 4am, then a slight chance of showers. Low around 74. Breezy, with a south southwest wind 19 to 24 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 37 mph. Chance of precipitation is 80%.
Thursday
A chance of showers, with thunderstorms also possible after 11am. Mostly sunny, with a high near 86. West southwest wind 6 to 8 mph becoming north northwest in the afternoon. Chance of precipitation is 40%.
Thursday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 64. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Juneteenth
Mostly sunny, with a high near 84. Calm wind becoming north northwest 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 63. Light north wind.
Saturday
Mostly sunny, with a high near 87. Calm wind becoming south around 6 mph in the afternoon.
Saturday Night
A chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. South wind around 5 mph becoming calm in the evening.
Sunday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 85. South wind 6 to 14 mph, with gusts as high as 22 mph.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 70. South southwest wind 10 to 15 mph, with gusts as high as 22 mph.
Monday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 84. Southwest wind around 11 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.
Monday Night
A chance of showers. Partly cloudy, with a low around 67. North wind 5 to 8 mph becoming calm in the evening.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. North wind 3 to 6 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
11:21 pm CDT Jun 16, 2026
Forecast Valid:
11pm CDT Jun 16, 2026-6pm CDT Jun 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