National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

72°F

22°C

Humidity 61%
Wind Speed S 5 mph
Barometer 29.98 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 11 Oct 7:15 pm CDT
Extended Forecast for

Herrin IL

  • Tonight

    Tonight: Mostly clear, with a low around 62. Calm wind becoming south southwest around 5 mph after midnight.

    Low: 62 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Partly sunny, then gradually becoming sunny, with a high near 91. Southwest wind 5 to 13 mph, with gusts as high as 18 mph.

    High: 91 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 66. South southwest wind around 8 mph.

    Low: 66 °F

    Clear

  • Tuesday

    Tuesday: Mostly cloudy through mid morning, then gradual clearing, with a high near 93. Southwest wind 7 to 11 mph.

    High: 93 °F

    Becoming
    Sunny

  • Tuesday Night

    Tuesday Night: A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly clear, with a low around 71. South southwest wind 5 to 7 mph. Chance of precipitation is 20%.

    Low: 71 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 87. South southwest wind 3 to 7 mph. Chance of precipitation is 80%.

    High: 87 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. Light and variable wind becoming south 5 to 10 mph in the morning.

    High: 82 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Southwest wind 5 to 11 mph becoming west northwest after midnight.

    Low: 57 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Mostly clear, with a low around 62. Calm wind becoming south southwest around 5 mph after midnight.
Columbus Day
Partly sunny, then gradually becoming sunny, with a high near 91. Southwest wind 5 to 13 mph, with gusts as high as 18 mph.
Monday Night
Clear, with a low around 66. South southwest wind around 8 mph.
Tuesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 93. Southwest wind 7 to 11 mph.
Tuesday Night
A slight chance of showers between 1am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly clear, with a low around 71. South southwest wind 5 to 7 mph. Chance of precipitation is 20%.
Wednesday
Showers and possibly a thunderstorm. High near 87. South southwest wind 3 to 7 mph. Chance of precipitation is 80%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 60%.
Thursday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 82. Light and variable wind becoming south 5 to 10 mph in the morning.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Southwest wind 5 to 11 mph becoming west northwest after midnight.
Friday
Partly sunny, with a high near 69. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 25 mph.
Friday Night
Partly cloudy, with a low around 41. Breezy, with a north northwest wind 10 to 20 mph, with gusts as high as 24 mph.
Saturday
Sunny, with a high near 61. North wind 10 to 14 mph.
Saturday Night
Clear, with a low around 36. North northeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 68. Calm wind becoming south 5 to 7 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Herrin IL
 37.8°N 89.03°W
Last Update:
2:01 pm CDT Oct 11, 2026
Forecast Valid:
7pm CDT Oct 11, 2026-6pm CDT Oct 18, 2026
 
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Additional Resources

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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