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

71°F

22°C

Humidity 98%
Wind Speed SW 6 mph
Barometer 29.91 in
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 20 Aug 3:15 am CDT
Extended Forecast for

Spillertown IL

Flood Watch until August 20, 07:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch until August 20, 07:00am

    NOW until 7:00am Thu

    Flood Watch

  • Overnight

    Low: 68 °F

    Chance
    T-storms

  • Thursday

    Thursday: Partly sunny, with a high near 85. Calm wind becoming north 5 to 7 mph in the morning.

    High: 85 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 66. Light northeast wind.

    Low: 66 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 87. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Calm wind becoming northwest 5 to 9 mph in the morning.

    High: 87 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64. North northwest wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 84. Calm wind becoming north northwest 5 to 8 mph in the afternoon.

    High: 84 °F

    Sunny

Detailed Forecast

Overnight
A 40 percent chance of showers and thunderstorms, mainly before 5am. Mostly cloudy, with a low around 68. Calm wind.
Thursday
Partly sunny, with a high near 85. Calm wind becoming north 5 to 7 mph in the morning.
Thursday Night
Mostly clear, with a low around 66. Light northeast wind.
Friday
Sunny, with a high near 87. Calm wind becoming north northwest around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 67. Calm wind.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 87. Calm wind becoming northwest 5 to 9 mph in the morning.
Saturday Night
Mostly clear, with a low around 64. North northwest wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 84. Calm wind becoming north northwest 5 to 8 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 62. Light and variable wind.
Monday
Mostly sunny, with a high near 83. Calm wind becoming east 5 to 7 mph in the afternoon.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 63. East wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 87. South southeast wind 3 to 6 mph.
Tuesday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 66. Light southeast wind.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 89. Calm wind becoming west northwest around 6 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Spillertown IL
 37.76°N 88.95°W
Last Update:
2:56 am CDT Aug 20, 2026
Forecast Valid:
3am CDT Aug 20, 2026-6pm CDT Aug 26, 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