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.

Partly Cloudy

69°F

21°C

Humidity 85%
Wind Speed Calm
Barometer 30.01 in
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 25 Jun 1:15 am CDT
Extended Forecast for

Marion IL

  • Overnight

    Overnight: A slight chance of showers, with thunderstorms also possible after 5am. Partly cloudy, with a steady temperature around 71. Calm wind. Chance of precipitation is 20%.

    Low: 71 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 88. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 88 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 4am, then showers likely and possibly a thunderstorm between 4am and 5am, then a chance of showers and thunderstorms after 5am. Increasing clouds, with a low around 70. Light south wind. Chance of precipitation is 60%.

    Low: 70 °F

    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7am. Mostly cloudy, with a high near 87. South wind 5 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.

    High: 87 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 72. South southwest wind 5 to 7 mph. Chance of precipitation is 60%.

    Low: 72 °F

    Chance
    T-storms then
    Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 89. Southwest wind 6 to 8 mph. Chance of precipitation is 60%.

    High: 89 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South wind 3 to 6 mph.

    Low: 73 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 95. South southwest wind 7 to 13 mph, with gusts as high as 18 mph.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 75. South southwest wind 5 to 10 mph.

    Low: 75 °F

    Clear

Detailed Forecast

Overnight
A slight chance of showers, with thunderstorms also possible after 5am. Partly cloudy, with a steady temperature around 71. Calm wind. Chance of precipitation is 20%.
Thursday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 88. Calm wind becoming southwest around 6 mph in the afternoon.
Thursday Night
Showers and thunderstorms likely before 4am, then showers likely and possibly a thunderstorm between 4am and 5am, then a chance of showers and thunderstorms after 5am. Increasing clouds, with a low around 70. Light south wind. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7am. Mostly cloudy, with a high near 87. South wind 5 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 70%.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 72. South southwest wind 5 to 7 mph. Chance of precipitation is 60%.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 89. Southwest wind 6 to 8 mph. Chance of precipitation is 60%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South wind 3 to 6 mph.
Sunday
Sunny, with a high near 95. South southwest wind 7 to 13 mph, with gusts as high as 18 mph.
Sunday Night
Clear, with a low around 75. South southwest wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 98. South southwest wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 75. South wind 5 to 8 mph becoming calm in the evening.
Tuesday
Sunny and hot, with a high near 99. Calm wind becoming south southwest around 6 mph in the morning.
Tuesday Night
Clear, with a low around 76. South wind around 6 mph becoming calm in the evening.
Wednesday
Sunny and hot, with a high near 100. Calm wind becoming 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:
9:51 pm CDT Jun 24, 2026
Forecast Valid:
1am CDT Jun 25, 2026-6pm CDT Jul 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