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.

Overcast

45°F

7°C

Humidity 87%
Wind Speed N 3 mph
Barometer 30.08 in
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 8 Mar 2:35 am CDT
Extended Forecast for

Marion IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 40. Light northwest wind.

    Low: 40 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 65. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 65 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 45. South southwest wind around 6 mph.

    Low: 45 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 74. South southwest wind 6 to 15 mph, with gusts as high as 24 mph.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 62. South southwest wind 8 to 13 mph, with gusts as high as 22 mph.

    Low: 62 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 78. South southwest wind 8 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

    High: 78 °F

    Slight Chance
    Showers then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm. Low around 63. South southwest wind 14 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 80%.

    Low: 63 °F

    Showers

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. Cloudy, with a high near 71. South southwest wind around 18 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph.

    High: 71 °F

    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers before midnight. Partly cloudy, with a low around 34. Breezy, with a northwest wind 15 to 20 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 28 mph.

    Low: 34 °F

    Chance
    Showers and
    Breezy then
    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 40. Light northwest wind.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 65. Calm wind becoming southwest around 6 mph in the afternoon.
Sunday Night
Clear, with a low around 45. South southwest wind around 6 mph.
Monday
Sunny, with a high near 74. South southwest wind 6 to 15 mph, with gusts as high as 24 mph.
Monday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a low around 62. South southwest wind 8 to 13 mph, with gusts as high as 22 mph.
Tuesday
A chance of showers, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 78. South southwest wind 8 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 63. South southwest wind 14 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 80%.
Wednesday
Showers and possibly a thunderstorm. Cloudy, with a high near 71. South southwest wind around 18 mph becoming northwest in the afternoon. Winds could gust as high as 30 mph.
Wednesday Night
A chance of showers before midnight. Partly cloudy, with a low around 34. Breezy, with a northwest wind 15 to 20 mph decreasing to 8 to 13 mph after midnight. Winds could gust as high as 28 mph.
Thursday
Sunny, with a high near 53. Northwest wind 7 to 9 mph becoming south southwest in the afternoon.
Thursday Night
Partly cloudy, with a low around 42. South southwest wind 6 to 16 mph, with gusts as high as 28 mph.
Friday
Partly sunny, with a high near 67. Southwest wind 13 to 18 mph, with gusts as high as 30 mph.
Friday Night
Mostly cloudy, with a low around 41. West southwest wind 7 to 10 mph becoming northeast after midnight.
Saturday
Mostly sunny, with a high near 60. East wind 8 to 11 mph, with gusts as high as 20 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
12:56 am CST Mar 8, 2026
Forecast Valid:
1am CST Mar 8, 2026-6pm CDT Mar 14, 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