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.

Partly Cloudy

90°F

32°C

Humidity 49%
Wind Speed Calm
Barometer 30.02 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 3 Jul 2:45 pm CDT
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 90. Calm wind.

    High: 90 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 71. Calm wind.

    Low: 71 °F

    Clear

  • Independence Day

    Independence Day: Sunny, with a high near 92. Calm wind becoming south southeast around 5 mph.

    High: 92 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 72. Calm wind.

    Low: 72 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 94. Calm wind becoming south southwest around 6 mph in the afternoon.

    High: 94 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73. Light south wind.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Calm wind becoming west southwest 5 to 7 mph in the morning.

    High: 93 °F

    Sunny then
    Slight Chance
    T-storms

  • Sunday Night

    Sunday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Southwest wind around 5 mph becoming calm in the evening.

    Low: 74 °F

    Slight Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91. Calm wind becoming west around 5 mph in the afternoon.

    High: 91 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Sunny, with a high near 90. Calm wind.
Tonight
Clear, with a low around 71. Calm wind.
Independence Day
Sunny, with a high near 92. Calm wind becoming south southeast around 5 mph.
Friday Night
Clear, with a low around 72. Calm wind.
Saturday
Sunny, with a high near 94. Calm wind becoming south southwest around 6 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 73. Light south wind.
Sunday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Calm wind becoming west southwest 5 to 7 mph in the morning.
Sunday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Southwest wind around 5 mph becoming calm in the evening.
Monday
A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91. Calm wind becoming west around 5 mph in the afternoon.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 72. Calm wind.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 91. Light west northwest wind.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Calm wind.
Wednesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 88. Calm wind becoming west southwest around 5 mph in the afternoon.
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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:
2:01 pm CDT Jul 3, 2025
Forecast Valid:
3pm CDT Jul 3, 2025-6pm CDT Jul 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