Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

32°F

0°C

Humidity 44%
Wind Speed E 9 mph
Barometer 30.29 in
Dewpoint 12°F (-11°C)
Visibility 10.00 mi
Wind Chill24°F (-4°C)
Last update 29 Jan 10:47 am CST
Extended Forecast for

Herrin IL

  • Today

    Today: Mostly cloudy, with a high near 28. East northeast wind 5 to 7 mph.

    High: 28 °F

    Mostly Cloudy

  • Tonight

    Tonight: A chance of flurries with a slight chance of snow before 1am, then a chance of flurries between 1am and 3am.  Cloudy, with a low around 11. North northeast wind around 6 mph.  Chance of precipitation is 20%.

    Low: 11 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Friday

    Friday: Partly sunny, with a high near 21. North wind 6 to 13 mph.

    High: 21 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 5. Wind chill values as low as -9. North northwest wind 8 to 10 mph, with gusts as high as 18 mph.

    Low: 5 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 19. Northwest wind 9 to 14 mph, with gusts as high as 21 mph.

    High: 19 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 2. Northwest wind 5 to 8 mph becoming calm  after midnight.

    Low: 2 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 27. Calm wind becoming south southwest 5 to 7 mph in the morning.

    High: 27 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A slight chance of snow showers before midnight.  Mostly cloudy, with a low around 17. South southwest wind around 6 mph.

    Low: 17 °F

    Slight Chance
    Snow Showers
    then Mostly
    Cloudy

  • Monday

    Monday: Partly sunny, with a high near 35. West southwest wind 5 to 8 mph.

    High: 35 °F

    Partly Sunny

Detailed Forecast

Today
Mostly cloudy, with a high near 28. East northeast wind 5 to 7 mph.
Tonight
A chance of flurries with a slight chance of snow before 1am, then a chance of flurries between 1am and 3am. Cloudy, with a low around 11. North northeast wind around 6 mph. Chance of precipitation is 20%.
Friday
Partly sunny, with a high near 21. North wind 6 to 13 mph.
Friday Night
Mostly cloudy, with a low around 5. Wind chill values as low as -9. North northwest wind 8 to 10 mph, with gusts as high as 18 mph.
Saturday
Mostly sunny, with a high near 19. Northwest wind 9 to 14 mph, with gusts as high as 21 mph.
Saturday Night
Mostly clear, with a low around 2. Northwest wind 5 to 8 mph becoming calm after midnight.
Sunday
Mostly sunny, with a high near 27. Calm wind becoming south southwest 5 to 7 mph in the morning.
Sunday Night
A slight chance of snow showers before midnight. Mostly cloudy, with a low around 17. South southwest wind around 6 mph.
Monday
Partly sunny, with a high near 35. West southwest wind 5 to 8 mph.
Monday Night
Mostly cloudy, with a low around 23. West southwest wind around 5 mph becoming calm in the evening.
Tuesday
Mostly cloudy, with a high near 38. South southwest wind 3 to 6 mph.
Tuesday Night
A chance of rain and snow showers. Mostly cloudy, with a low around 24. Calm wind becoming north around 6 mph after midnight.
Wednesday
A chance of snow showers. Mostly cloudy, with a high near 36. North northwest wind 6 to 9 mph.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Herrin IL
 37.81°N 89.06°W
10:47 am CST Jan 29, 2026
11am CST Jan 29, 2026-6pm CST Feb 4, 2026
 
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