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

82°F

28°C

Humidity 66%
Wind Speed SW 18 mph
Barometer 30.04 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 19 May 3:45 pm CDT
Extended Forecast for

4 Miles S Frankfort Heights IL

Flood Watch until May 20, 01:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch until May 20, 01:00pm

    NOW until 1:00pm Wed

    Flood Watch

  • This Afternoon

    High: 77 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 2am, then showers likely and possibly a thunderstorm after 3am. Mostly cloudy, with a low around 61. West southwest wind around 6 mph becoming calm. Chance of precipitation is 60%.

    Low: 61 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers and thunderstorms likely before 10am, then a chance of showers between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 68. North northeast wind 8 to 10 mph. Chance of precipitation is 60%.

    High: 68 °F

    Showers
    Likely then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 56. Northeast wind 5 to 9 mph.

    Low: 56 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 73. Northeast wind 7 to 9 mph.

    High: 73 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Showers, with thunderstorms also possible after 4am. Low around 59. East northeast wind 7 to 9 mph. Chance of precipitation is 80%.

    Low: 59 °F

    Chance
    Showers then
    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 77. East wind 7 to 9 mph becoming south southwest in the afternoon. Chance of precipitation is 90%.

    High: 77 °F

    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 61. West southwest wind 3 to 8 mph.

    Low: 61 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a steady temperature around 77. West southwest wind around 11 mph, with gusts as high as 20 mph.
Tonight
Showers and thunderstorms likely, mainly before 2am, then showers likely and possibly a thunderstorm after 3am. Mostly cloudy, with a low around 61. West southwest wind around 6 mph becoming calm. Chance of precipitation is 60%.
Wednesday
Showers and thunderstorms likely before 10am, then a chance of showers between 10am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 68. North northeast wind 8 to 10 mph. Chance of precipitation is 60%.
Wednesday Night
Mostly cloudy, with a low around 56. Northeast wind 5 to 9 mph.
Thursday
Mostly cloudy, with a high near 73. Northeast wind 7 to 9 mph.
Thursday Night
Showers, with thunderstorms also possible after 4am. Low around 59. East northeast wind 7 to 9 mph. Chance of precipitation is 80%.
Friday
Showers and possibly a thunderstorm. High near 77. East wind 7 to 9 mph becoming south southwest in the afternoon. Chance of precipitation is 90%.
Friday Night
A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 61. West southwest wind 3 to 8 mph.
Saturday
A slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 81. Southwest wind 3 to 5 mph.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Light and variable wind.
Sunday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 81. Light south wind.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Calm wind.
Memorial Day
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Calm wind becoming east southeast around 6 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Frankfort Heights IL
 37.84°N 88.86°W
Last Update:
2:51 pm CDT May 19, 2026
Forecast Valid:
4pm CDT May 19, 2026-6pm CDT May 25, 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