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.

Fog/Mist

32°F

0°C

Humidity 96%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 31°F (-1°C)
Visibility 0.75 mi
Last update 16 Feb 2:55 am CST
Extended Forecast for

Herrin ILSimilar City Names

Dense Fog Advisory February 16, 03:09am until February 16, 09:00am
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory February 16, 03:09am until February 16, 09:00am

    NOW until 9:00am Mon

    Dense Fog Advisory

  • Overnight

    Low: 35 °F

    Areas Dense
    Fog

  • Washington's Birthday

    Washington's Birthday: Areas of dense fog before 9am. Otherwise, mostly sunny, with a high near 64. Light south wind becoming south southwest 5 to 10 mph in the morning.

    High: 64 °F

    Areas Dense
    Fog then
    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42. South wind 5 to 7 mph.

    Low: 42 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 64. South wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph.

    High: 64 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 58. Breezy, with a south wind 20 to 22 mph, with gusts as high as 33 mph.

    Low: 58 °F

    Mostly Cloudy
    and Breezy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 73. South southwest wind 9 to 18 mph, with gusts as high as 30 mph.

    High: 73 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after midnight. Partly cloudy, with a low around 49. South southwest wind 6 to 8 mph.

    Low: 49 °F

    Mostly Clear
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 72. South southwest wind 6 to 15 mph, with gusts as high as 24 mph.

    High: 72 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Overnight
Areas of dense fog. Otherwise, partly cloudy, with a low around 35. Calm wind.
Washington's Birthday
Areas of dense fog before 9am. Otherwise, mostly sunny, with a high near 64. Light south wind becoming south southwest 5 to 10 mph in the morning.
Monday Night
Partly cloudy, with a low around 42. South wind 5 to 7 mph.
Tuesday
Mostly cloudy, with a high near 64. South wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 26 mph.
Tuesday Night
Mostly cloudy, with a low around 58. Breezy, with a south wind 20 to 22 mph, with gusts as high as 33 mph.
Wednesday
Mostly sunny, with a high near 73. South southwest wind 9 to 18 mph, with gusts as high as 30 mph.
Wednesday Night
A 20 percent chance of showers after midnight. Partly cloudy, with a low around 49. South southwest wind 6 to 8 mph.
Thursday
A chance of showers, with thunderstorms also possible after noon. Mostly sunny, with a high near 72. South southwest wind 6 to 15 mph, with gusts as high as 24 mph.
Thursday Night
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 42. West wind 9 to 13 mph, with gusts as high as 20 mph.
Friday
A slight chance of showers after noon. Mostly sunny, with a high near 57. West wind 7 to 11 mph, with gusts as high as 18 mph.
Friday Night
A chance of showers. Mostly cloudy, with a low around 34. North northwest wind around 6 mph.
Saturday
A slight chance of showers. Partly sunny, with a high near 52. North northwest wind 6 to 9 mph.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 31. Northwest wind 7 to 9 mph.
Sunday
A slight chance of showers. Mostly sunny, with a high near 45. Northwest wind 9 to 13 mph, with gusts as high as 20 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Herrin ILSimilar City Names
 37.8°N 89.03°W
Last Update:
2:06 am CST Feb 16, 2026
Forecast Valid:
3am CST Feb 16, 2026-6pm CST Feb 22, 2026
 
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