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.

Partly Cloudy

68°F

20°C

Humidity 78%
Wind Speed S 5 mph
Barometer 29.84 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 26 Dec 4:45 pm CST
Extended Forecast for

Herrin ILSimilar City Names

  • Tonight

    Tonight: Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 48. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 48 °F

    Partly Cloudy
    then Patchy
    Fog

  • Saturday

    Saturday: Patchy fog before 9am. Otherwise, partly sunny, with a high near 68. Light east wind becoming southeast 5 to 9 mph in the morning.

    High: 68 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 61. South southwest wind 8 to 11 mph, with gusts as high as 18 mph.

    Low: 61 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers likely, with thunderstorms also possible after 3pm. Cloudy, with a high near 72. South southwest wind 11 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.

    High: 72 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Sunday Night

    Sunday Night: Rain showers before midnight, then a chance of rain and snow showers. Some thunder is also possible. Low around 24. Breezy, with a southwest wind around 21 mph becoming west northwest in the evening. Winds could gust as high as 31 mph. Chance of precipitation is 90%.

    Low: 24 °F

    Showers and
    Breezy then
    Chance
    Rain/Snow and
    Blustery

  • Monday

    Monday: Mostly sunny, with a high near 29. Blustery, with a west northwest wind 16 to 20 mph, with gusts as high as 31 mph.

    High: 29 °F

    Mostly Sunny
    and Blustery
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 19. Northwest wind 9 to 15 mph, with gusts as high as 21 mph.

    Low: 19 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 36. Northwest wind 7 to 10 mph becoming west southwest in the afternoon.

    High: 36 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 26. Southwest wind around 6 mph.

    Low: 26 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 48. North northwest wind 5 to 7 mph becoming calm in the evening.
Saturday
Patchy fog before 9am. Otherwise, partly sunny, with a high near 68. Light east wind becoming southeast 5 to 9 mph in the morning.
Saturday Night
Mostly cloudy, with a low around 61. South southwest wind 8 to 11 mph, with gusts as high as 18 mph.
Sunday
Showers likely, with thunderstorms also possible after 3pm. Cloudy, with a high near 72. South southwest wind 11 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 60%.
Sunday Night
Rain showers before midnight, then a chance of rain and snow showers. Some thunder is also possible. Low around 24. Breezy, with a southwest wind around 21 mph becoming west northwest in the evening. Winds could gust as high as 31 mph. Chance of precipitation is 90%.
Monday
Mostly sunny, with a high near 29. Blustery, with a west northwest wind 16 to 20 mph, with gusts as high as 31 mph.
Monday Night
Mostly clear, with a low around 19. Northwest wind 9 to 15 mph, with gusts as high as 21 mph.
Tuesday
Sunny, with a high near 36. Northwest wind 7 to 10 mph becoming west southwest in the afternoon.
Tuesday Night
Mostly clear, with a low around 26. Southwest wind around 6 mph.
Wednesday
Partly sunny, with a high near 44. West northwest wind 6 to 10 mph.
Wednesday Night
Partly cloudy, with a low around 23. West northwest wind around 6 mph.
New Year's Day
Mostly sunny, with a high near 33. North northwest wind 5 to 8 mph.
Thursday Night
Mostly cloudy, with a low around 17. Light north northwest wind.
Friday
Mostly sunny, with a high near 32. Light and variable wind becoming north northeast 5 to 7 mph in the morning.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Herrin ILSimilar City Names
 37.8°N 89.03°W
Last Update:
3:16 pm CST Dec 26, 2025
Forecast Valid:
5pm CST Dec 26, 2025-6pm CST Jan 2, 2026
 
Forecast Discussion
 
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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation