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

37°F

3°C

Humidity 45%
Wind Speed NE 3 mph
Barometer 30.50 in
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Last update 28 Nov 10:45 am CST
Extended Forecast for

Herrin IL

  • Today

    Today: Sunny, with a high near 40. North northwest wind around 5 mph becoming calm in the afternoon.

    High: 40 °F

    Sunny

  • Tonight

    Tonight: A slight chance of rain showers between 2am and 3am, then a chance of snow showers. Increasing clouds, with a low around 30. Calm wind becoming southeast 5 to 7 mph after midnight. Chance of precipitation is 40%.

    Low: 30 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

  • Saturday

    Saturday: Rain and snow likely, possibly mixed with sleet before 9am, then rain, possibly mixed with snow between 9am and 11am, then rain after 11am. High near 41. Southeast wind 7 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New snow and sleet accumulation of less than a half inch possible.

    High: 41 °F

    Wintry Mix
    then Rain

  • Saturday Night

    Saturday Night: Rain, mainly before midnight. Low around 27. South wind 13 to 17 mph becoming west northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%.

    Low: 27 °F

    Rain then
    Slight Chance
    Rain

  • Sunday

    Sunday: Mostly cloudy, with a high near 34. Northwest wind 10 to 15 mph, with gusts as high as 22 mph.

    High: 34 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 21. North northwest wind 5 to 9 mph becoming northeast after midnight.

    Low: 21 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 33. East northeast wind around 6 mph.

    High: 33 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: A chance of snow. Mostly cloudy, with a low around 22. Light north northeast wind.

    Low: 22 °F

    Chance Snow

  • Tuesday

    Tuesday: Partly sunny, with a high near 34. North northwest wind 3 to 6 mph.

    High: 34 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 40. North northwest wind around 5 mph becoming calm in the afternoon.
Tonight
A slight chance of rain showers between 2am and 3am, then a chance of snow showers. Increasing clouds, with a low around 30. Calm wind becoming southeast 5 to 7 mph after midnight. Chance of precipitation is 40%.
Saturday
Rain and snow likely, possibly mixed with sleet before 9am, then rain, possibly mixed with snow between 9am and 11am, then rain after 11am. High near 41. Southeast wind 7 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 100%. New snow and sleet accumulation of less than a half inch possible.
Saturday Night
Rain, mainly before midnight. Low around 27. South wind 13 to 17 mph becoming west northwest after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 90%.
Sunday
Mostly cloudy, with a high near 34. Northwest wind 10 to 15 mph, with gusts as high as 22 mph.
Sunday Night
Mostly cloudy, with a low around 21. North northwest wind 5 to 9 mph becoming northeast after midnight.
Monday
Mostly cloudy, with a high near 33. East northeast wind around 6 mph.
Monday Night
A chance of snow. Mostly cloudy, with a low around 22. Light north northeast wind.
Tuesday
Partly sunny, with a high near 34. North northwest wind 3 to 6 mph.
Tuesday Night
Partly cloudy, with a low around 20. Calm wind.
Wednesday
Mostly sunny, with a high near 41. Calm wind becoming south southwest 5 to 8 mph in the morning.
Wednesday Night
Mostly cloudy, with a low around 26. Calm wind becoming west northwest around 5 mph after midnight.
Thursday
Partly sunny, with a high near 38. Northwest wind 5 to 7 mph.
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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:
10:26 am CST Nov 28, 2025
Forecast Valid:
10am CST Nov 28, 2025-6pm CST Dec 4, 2025
 
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Additional Resources

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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