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

79°F

26°C

Humidity 54%
Wind Speed E 5 mph
Barometer 30.09 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 1 Oct 6:47 pm CDT
Extended Forecast for

Herrin IL

  • Tonight

    Tonight: Partly cloudy, with a low around 63. East wind around 6 mph becoming calm in the evening.

    Low: 63 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 89. Calm wind becoming south around 6 mph in the afternoon.

    High: 89 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88. Calm wind becoming south southwest around 6 mph in the morning.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 60. Light south wind.

    Low: 60 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 86. Calm wind becoming south southeast 5 to 8 mph in the morning.

    High: 86 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 59. South southeast wind 3 to 5 mph.

    Low: 59 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 86. South wind 5 to 10 mph.

    High: 86 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 64. South southeast wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 63. East wind around 6 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 89. Calm wind becoming south around 6 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 64. Calm wind.
Friday
Sunny, with a high near 88. Calm wind becoming south southwest around 6 mph in the morning.
Friday Night
Clear, with a low around 60. Light south wind.
Saturday
Sunny, with a high near 86. Calm wind becoming south southeast 5 to 8 mph in the morning.
Saturday Night
Clear, with a low around 59. South southeast wind 3 to 5 mph.
Sunday
Sunny, with a high near 86. South wind 5 to 10 mph.
Sunday Night
Mostly clear, with a low around 64. South southeast wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 86. Calm wind becoming south around 6 mph in the morning.
Monday Night
Partly cloudy, with a low around 63. Light southeast wind.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. Light and variable wind becoming south 5 to 7 mph in the morning.
Tuesday Night
A slight chance of showers. Partly cloudy, with a low around 59. Northeast wind around 6 mph becoming north northwest after midnight.
Wednesday
Mostly sunny, with a high near 78. North northeast wind 6 to 9 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:
6:01 pm CDT Oct 1, 2025
Forecast Valid:
6pm CDT Oct 1, 2025-6pm CDT Oct 8, 2025
 
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Additional Resources

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High Temperature

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Chance of Precipitation