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.

Light Rain

74°F

23°C

Humidity 98%
Wind Speed N 13 G 24 mph
Barometer 30.01 in
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Last update 17 Aug 12:35 am CDT
Extended Forecast for

Marion IL

  • Overnight

    Overnight: A 40 percent chance of showers and thunderstorms, mainly before 2am. Mostly cloudy, with a low around 73. Light northwest wind.

    Low: 73 °F

    Chance
    T-storms

  • Monday

    Monday: Partly sunny, with a high near 89. North northwest wind 5 to 11 mph.

    High: 89 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 66. North northwest wind 5 to 8 mph becoming calm in the evening.

    Low: 66 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 90. Light north wind.

    High: 90 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 70. Calm wind.

    Low: 70 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 92. Calm wind becoming southeast 5 to 7 mph in the morning.

    High: 92 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 68. Northeast wind 3 to 6 mph. Chance of precipitation is 60%.

    Low: 68 °F

    Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 84. North wind 5 to 8 mph.

    High: 84 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 64. Northeast wind around 6 mph becoming calm in the evening.

    Low: 64 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 40 percent chance of showers and thunderstorms, mainly before 2am. Mostly cloudy, with a low around 73. Light northwest wind.
Monday
Partly sunny, with a high near 89. North northwest wind 5 to 11 mph.
Monday Night
Partly cloudy, with a low around 66. North northwest wind 5 to 8 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 90. Light north wind.
Tuesday Night
Mostly clear, with a low around 70. Calm wind.
Wednesday
A 40 percent chance of showers and thunderstorms, mainly before 1pm. Mostly sunny, with a high near 92. Calm wind becoming southeast 5 to 7 mph in the morning.
Wednesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 68. Northeast wind 3 to 6 mph. Chance of precipitation is 60%.
Thursday
A chance of showers and thunderstorms, mainly before 1pm. Mostly cloudy, with a high near 84. North wind 5 to 8 mph.
Thursday Night
A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 64. Northeast wind around 6 mph becoming calm in the evening.
Friday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 85. Calm wind becoming north 5 to 7 mph in the morning.
Friday Night
Mostly clear, with a low around 63. Light north wind.
Saturday
Sunny, with a high near 86. Calm wind becoming northwest 5 to 7 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 64. Light north wind.
Sunday
Sunny, with a high near 85. Calm wind becoming north 5 to 7 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
11:41 pm CDT Aug 16, 2026
Forecast Valid:
12am CDT Aug 17, 2026-6pm CDT Aug 23, 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