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.

Fair

69°F

21°C

Humidity 91%
Wind Speed Calm
Barometer 30.01 in
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 15 Sep 1:35 am CDT
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Partly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 92. Calm wind becoming east around 6 mph in the morning.

    High: 92 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 65. Light east wind.

    Low: 65 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 92. Calm wind becoming east around 6 mph in the afternoon.

    High: 92 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 93. Calm wind becoming east around 5 mph in the afternoon.

    High: 93 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 93. Calm wind becoming south around 6 mph in the afternoon.

    High: 93 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 65. Light south wind.

    Low: 65 °F

    Slight Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a low around 68. Calm wind.
Monday
Mostly sunny, with a high near 92. Calm wind becoming east around 6 mph in the morning.
Monday Night
Mostly clear, with a low around 65. Light east wind.
Tuesday
Sunny, with a high near 92. Calm wind becoming east around 6 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 64. Calm wind.
Wednesday
Sunny, with a high near 93. Calm wind becoming east around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 64. Calm wind.
Thursday
Mostly sunny, with a high near 93. Calm wind becoming south around 6 mph in the afternoon.
Thursday Night
A chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 65. Light south wind.
Friday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Calm wind becoming west southwest around 6 mph in the morning.
Friday Night
A chance of showers. Partly cloudy, with a low around 64. Light and variable wind.
Saturday
A chance of showers. Mostly sunny, with a high near 85. Calm wind becoming south around 6 mph in the afternoon.
Saturday Night
A slight chance of showers. Partly cloudy, with a low around 61. Light and variable wind.
Sunday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. Calm wind becoming southwest 5 to 7 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
12:01 am CDT Sep 15, 2025
Forecast Valid:
1am CDT Sep 15, 2025-6pm CDT Sep 21, 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