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

72°F

22°C

Humidity 98%
Wind Speed Calm
Barometer 29.99 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 17 Aug 6:15 am CDT
Extended Forecast for

3 Miles W Marion IL

  • Today

    Today: Partly sunny, with a high near 87. Light north northwest wind increasing to 5 to 10 mph in the morning.

    High: 87 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 65. North northwest wind 5 to 8 mph becoming calm in the evening.

    Low: 65 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 89. Calm wind.

    High: 89 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly clear, with a low around 69. Light southeast wind. Chance of precipitation is 30%.

    Low: 69 °F

    Mostly Clear
    then Chance
    Showers

  • Wednesday

    Wednesday: Showers likely and possibly a thunderstorm before 10am, then showers likely between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91. Light and variable wind becoming south 5 to 7 mph in the morning. Chance of precipitation is 70%.

    High: 91 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Light northeast wind. Chance of precipitation is 70%.

    Low: 69 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. North northeast wind 3 to 7 mph. Chance of precipitation is 60%.

    High: 85 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66. North northeast wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 85. Calm wind becoming north 5 to 7 mph in the afternoon.

    High: 85 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 87. Light north northwest wind increasing to 5 to 10 mph in the morning.
Tonight
Partly cloudy, with a low around 65. North northwest wind 5 to 8 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 89. Calm wind.
Tuesday Night
A chance of showers between 1am and 4am, then a chance of showers and thunderstorms after 4am. Mostly clear, with a low around 69. Light southeast wind. Chance of precipitation is 30%.
Wednesday
Showers likely and possibly a thunderstorm before 10am, then showers likely between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 91. Light and variable wind becoming south 5 to 7 mph in the morning. Chance of precipitation is 70%.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 69. Light northeast wind. Chance of precipitation is 70%.
Thursday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. North northeast wind 3 to 7 mph. Chance of precipitation is 60%.
Thursday Night
A chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 66. North northeast wind around 5 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 85. Calm wind becoming north 5 to 7 mph in the afternoon.
Friday Night
Mostly clear, with a low around 64. Light north wind.
Saturday
Sunny, with a high near 87. Calm wind becoming northwest 5 to 8 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 65. North northwest wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 86. Calm wind becoming north northwest 5 to 7 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles W Marion IL
 37.74°N 89°W
Last Update:
5:26 am CDT Aug 17, 2026
Forecast Valid:
6am CDT Aug 17, 2026-6pm CDT Aug 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