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

88°F

31°C

Humidity 55%
Wind Speed SW 9 mph
Barometer 29.96 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 26 Aug 2:45 pm CDT
Extended Forecast for

Marion IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 91. West wind around 6 mph.

    High: 91 °F

    Sunny

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly between 11pm and 1am. Partly cloudy, with a low around 67. Calm wind.

    Low: 67 °F

    Chance
    Showers

  • Thursday

    Thursday: Sunny, with a high near 89. Calm wind becoming north northwest 5 to 9 mph in the morning.

    High: 89 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 63. North northwest wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88. Calm wind becoming north northeast 5 to 7 mph in the afternoon.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 60. Northeast wind around 5 mph becoming calm in the evening.

    Low: 60 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 91. Calm wind becoming south southeast around 5 mph in the afternoon.

    High: 91 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. Calm wind.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 94. Light south wind becoming south southwest 6 to 11 mph in the morning.

    High: 94 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 91. West wind around 6 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly between 11pm and 1am. Partly cloudy, with a low around 67. Calm wind.
Thursday
Sunny, with a high near 89. Calm wind becoming north northwest 5 to 9 mph in the morning.
Thursday Night
Mostly clear, with a low around 63. North northwest wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 88. Calm wind becoming north northeast 5 to 7 mph in the afternoon.
Friday Night
Clear, with a low around 60. Northeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 91. Calm wind becoming south southeast around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 63. Calm wind.
Sunday
Sunny, with a high near 94. Light south wind becoming south southwest 6 to 11 mph in the morning.
Sunday Night
Mostly clear, with a low around 69. South wind 3 to 6 mph.
Monday
Sunny, with a high near 95. South southwest wind 5 to 11 mph.
Monday Night
Mostly clear, with a low around 73. South wind 3 to 7 mph.
Tuesday
Sunny and hot, with a high near 97. Light south southwest wind becoming southwest 5 to 9 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
2:26 pm CDT Aug 26, 2026
Forecast Valid:
3pm CDT Aug 26, 2026-6pm CDT Sep 1, 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