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.

Fair

88°F

31°C

Humidity 52%
Wind Speed W 10 mph
Barometer 30.02 in
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index92°F (33°C)
Last update 19 Sep 9:45 am CDT
Extended Forecast for

Valier IL

Heat Advisory September 19, 10:22am until September 20, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 19, 10:22am until September 20, 07:00pm

    NOW until 7:00pm Sun

    Heat Advisory

  • Today

    High: 99 °F

    Hot

  • Tonight

    Tonight: Mostly clear, with a low around 72. Calm wind becoming southwest around 5 mph after midnight.

    Low: 72 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 97. West wind 5 to 8 mph.

    High: 97 °F

    Hot

  • Sunday Night

    Sunday Night: A 40 percent chance of showers and thunderstorms after midnight. Increasing clouds, with a low around 68. Light and variable wind becoming northeast 5 to 7 mph in the evening.

    Low: 68 °F

    Partly Cloudy
    then Chance
    T-storms

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 87. Northeast wind 6 to 9 mph.

    High: 87 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 62. North northeast wind 5 to 9 mph.

    Low: 62 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: A 20 percent chance of showers before 1pm. Partly sunny, with a high near 77. North wind 7 to 13 mph.

    High: 77 °F

    Slight Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 57. North wind 5 to 13 mph.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Today
Sunny and hot, with a high near 99. West southwest wind 5 to 9 mph.
Tonight
Mostly clear, with a low around 72. Calm wind becoming southwest around 5 mph after midnight.
Sunday
Mostly sunny and hot, with a high near 97. West wind 5 to 8 mph.
Sunday Night
A 40 percent chance of showers and thunderstorms after midnight. Increasing clouds, with a low around 68. Light and variable wind becoming northeast 5 to 7 mph in the evening.
Monday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 87. Northeast wind 6 to 9 mph.
Monday Night
A 50 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 62. North northeast wind 5 to 9 mph.
Tuesday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 77. North wind 7 to 13 mph.
Tuesday Night
Partly cloudy, with a low around 57. North wind 5 to 13 mph.
Wednesday
Mostly sunny, with a high near 77. North wind 7 to 11 mph.
Wednesday Night
Partly cloudy, with a low around 56. North wind 5 to 9 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 78. North wind 3 to 8 mph.
Thursday Night
Partly cloudy, with a low around 59. North wind around 6 mph becoming calm in the evening.
Friday
Partly sunny, with a high near 80. Calm wind becoming north northeast 5 to 9 mph in the morning.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Valier IL
 38.01°N 89.05°W
Last Update:
10:16 am CDT Sep 19, 2026
Forecast Valid:
10am CDT Sep 19, 2026-6pm CDT Sep 25, 2026
 
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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