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

72°F

22°C

Humidity 53%
Wind Speed E 12 mph
Barometer 30.06 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 10 Oct 1:45 pm CDT
Extended Forecast for

Herrin IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 75. East wind around 8 mph.

    High: 75 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 30 percent chance of showers, mainly before 9pm. Mostly cloudy, with a low around 56. East northeast wind 5 to 9 mph becoming light and variable after midnight.

    Low: 56 °F

    Chance
    Showers then
    Mostly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 84. West northwest wind 3 to 7 mph.

    High: 84 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 61. Light and variable wind.

    Low: 61 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 92. Light south southwest wind becoming southwest 6 to 11 mph in the morning.

    High: 92 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 65. South southwest wind around 8 mph.

    Low: 65 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 93. Southwest wind 7 to 11 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 68. Southwest wind 5 to 7 mph.

    Low: 68 °F

    Mostly Clear

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 87. Southwest wind 6 to 9 mph becoming north northeast in the afternoon.

    High: 87 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 75. East wind around 8 mph.
Tonight
A 30 percent chance of showers, mainly before 9pm. Mostly cloudy, with a low around 56. East northeast wind 5 to 9 mph becoming light and variable after midnight.
Sunday
Sunny, with a high near 84. West northwest wind 3 to 7 mph.
Sunday Night
Mostly clear, with a low around 61. Light and variable wind.
Columbus Day
Sunny, with a high near 92. Light south southwest wind becoming southwest 6 to 11 mph in the morning.
Monday Night
Clear, with a low around 65. South southwest wind around 8 mph.
Tuesday
Sunny, with a high near 93. Southwest wind 7 to 11 mph.
Tuesday Night
Mostly clear, with a low around 68. Southwest wind 5 to 7 mph.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 87. Southwest wind 6 to 9 mph becoming north northeast in the afternoon.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. East wind 3 to 7 mph.
Thursday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 82. East wind 8 to 11 mph becoming south southwest in the afternoon.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. South southwest wind 6 to 9 mph.
Friday
A slight chance of showers. Mostly sunny, with a high near 74. West northwest wind 8 to 15 mph, with gusts as high as 20 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Herrin IL
 37.8°N 89.03°W
Last Update:
2:26 pm CDT Oct 10, 2026
Forecast Valid:
2pm CDT Oct 10, 2026-6pm CDT Oct 16, 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