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

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

82°F

28°C

Humidity 51%
Wind Speed S 12 mph
Barometer 30.19 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 3 Oct 3:45 pm CDT
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Sunny, with a steady temperature around 85. South wind around 9 mph.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: A slight chance of sprinkles before 8pm. Clear, with a low around 61. Light south wind.

    Low: 61 °F

    Slight Chance
    Sprinkles

  • Saturday

    Saturday: Sunny, with a high near 86. Calm wind becoming southeast 5 to 8 mph in the morning.

    High: 86 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 58. Light south southeast wind.

    Low: 58 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 86. South wind 5 to 10 mph.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 65. Southeast wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. South southeast wind 3 to 6 mph. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Slight Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Partly sunny, with a high near 81. Calm wind becoming west northwest around 6 mph in the morning.

    High: 81 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a steady temperature around 85. South wind around 9 mph.
Tonight
A slight chance of sprinkles before 8pm. Clear, with a low around 61. Light south wind.
Saturday
Sunny, with a high near 86. Calm wind becoming southeast 5 to 8 mph in the morning.
Saturday Night
Clear, with a low around 58. Light south southeast wind.
Sunday
Sunny, with a high near 86. South wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 65. Southeast wind around 5 mph becoming calm in the evening.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 83. South southeast wind 3 to 6 mph. Chance of precipitation is 30%.
Monday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 64. Calm wind.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 81. Calm wind becoming west northwest around 6 mph in the morning.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 59. North northeast wind 6 to 8 mph.
Wednesday
Mostly sunny, with a high near 75. Northeast wind 9 to 11 mph.
Wednesday Night
Mostly clear, with a low around 53. East northeast wind 5 to 7 mph.
Thursday
Sunny, with a high near 75. East wind 6 to 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.95°W
Last Update:
4:02 pm CDT Oct 3, 2025
Forecast Valid:
4pm CDT Oct 3, 2025-6pm CDT Oct 9, 2025
 
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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