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.

Fog

74°F

23°C

Humidity 98%
Wind Speed Calm
Barometer 29.95 in
Dewpoint 73°F (23°C)
Visibility 0.25 mi
Last update 26 Jul 3:15 am CDT
Extended Forecast for

2 Miles ESE Frankfort Heights IL

Heat Advisory July 26, 07:00pm until July 28, 07:00pm
Extreme Heat Warning July 26, 11:00am until July 26, 07:00pm
Click here for hazard details and duration
Heat Advisory
Extreme Heat Warning

  • Overnight

    Overnight: Mostly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers and thunderstorms between 9am and 11am. Partly sunny, with a high near 95. Heat index values as high as 106. Calm wind becoming west around 5 mph. Chance of precipitation is 20%.

    High: 95 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 77. Light south wind.

    Low: 77 °F

    Mostly Clear

  • Monday

    Monday: A slight chance of showers and thunderstorms between 1pm and 2pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 110. Light and variable wind becoming southwest 5 to 9 mph in the morning. Chance of precipitation is 20%.

    High: 99 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly clear, with a low around 79. South southwest wind 7 to 9 mph.

    Low: 79 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 95. Northwest wind 6 to 11 mph.

    High: 95 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. North wind 5 to 9 mph becoming light northeast after midnight.

    Low: 71 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: Sunny, with a high near 90. Light north northeast wind increasing to 5 to 9 mph in the morning.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 66. North wind around 6 mph becoming calm in the evening.

    Low: 66 °F

    Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 72. Calm wind.
Sunday
A slight chance of showers and thunderstorms between 9am and 11am. Partly sunny, with a high near 95. Heat index values as high as 106. Calm wind becoming west around 5 mph. Chance of precipitation is 20%.
Sunday Night
Mostly clear, with a low around 77. Light south wind.
Monday
A slight chance of showers and thunderstorms between 1pm and 2pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 110. Light and variable wind becoming southwest 5 to 9 mph in the morning. Chance of precipitation is 20%.
Monday Night
Mostly clear, with a low around 79. South southwest wind 7 to 9 mph.
Tuesday
Sunny, with a high near 95. Northwest wind 6 to 11 mph.
Tuesday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 71. North wind 5 to 9 mph becoming light northeast after midnight.
Wednesday
Sunny, with a high near 90. Light north northeast wind increasing to 5 to 9 mph in the morning.
Wednesday Night
Clear, with a low around 66. North wind around 6 mph becoming calm in the evening.
Thursday
Sunny, with a high near 90. Calm wind becoming northeast around 6 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 67. Light and variable wind.
Friday
A slight chance of showers and thunderstorms. Partly sunny, with a high near 88. Calm wind becoming south around 6 mph in the afternoon.
Friday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 68. Southeast wind around 6 mph becoming calm in the evening.
Saturday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 87. Calm wind becoming north northeast 5 to 9 mph in the morning.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ESE Frankfort Heights IL
 37.89°N 88.83°W
Last Update:
3:01 am CDT Jul 26, 2026
Forecast Valid:
3am CDT Jul 26, 2026-6pm CDT Aug 1, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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