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

55°F

13°C

Humidity 88%
Wind Speed Calm
Barometer 29.85 in
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 4 Nov 5:45 pm CST
Extended Forecast for

Herrin IL

  • Tonight

    Tonight: Mostly cloudy during the early evening, then gradual clearing, with a low around 46. West southwest wind around 5 mph becoming calm in the evening.

    Low: 46 °F

    Gradual
    Clearing

  • Thursday

    Thursday: Sunny, with a high near 67. West southwest wind 3 to 8 mph.

    High: 67 °F

    Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 43. Light northwest wind.

    Low: 43 °F

    Increasing
    Clouds

  • Friday

    Friday: Partly sunny, with a high near 58. Light north northwest wind becoming north 6 to 11 mph in the morning.

    High: 58 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 33. North wind 5 to 7 mph becoming calm in the evening.

    Low: 33 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 56. Calm wind becoming north around 6 mph.

    High: 56 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 32. Calm wind.

    Low: 32 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 59. Calm wind becoming northwest around 6 mph.

    High: 59 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 34. Calm wind.

    Low: 34 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly cloudy during the early evening, then gradual clearing, with a low around 46. West southwest wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 67. West southwest wind 3 to 8 mph.
Thursday Night
Increasing clouds, with a low around 43. Light northwest wind.
Friday
Partly sunny, with a high near 58. Light north northwest wind becoming north 6 to 11 mph in the morning.
Friday Night
Mostly clear, with a low around 33. North wind 5 to 7 mph becoming calm in the evening.
Saturday
Sunny, with a high near 56. Calm wind becoming north around 6 mph.
Saturday Night
Mostly clear, with a low around 32. Calm wind.
Sunday
Sunny, with a high near 59. Calm wind becoming northwest around 6 mph.
Sunday Night
Mostly clear, with a low around 34. Calm wind.
Monday
Sunny, with a high near 65. Calm wind becoming south southwest around 5 mph.
Monday Night
Clear, with a low around 37. Calm wind.
Tuesday
Sunny, with a high near 66. Calm wind becoming west around 6 mph.
Tuesday Night
Mostly clear, with a low around 39. Calm wind.
Veterans Day
Mostly sunny, with a high near 67. Calm wind becoming north around 6 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:
4:21 pm CST Nov 4, 2026
Forecast Valid:
6pm CST Nov 4, 2026-6pm CST Nov 11, 2026
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation