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.

Overcast

73°F

23°C

Humidity 57%
Wind Speed N 5 mph
Barometer 30.20 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 25 Sep 1:45 pm CDT
Extended Forecast for

Herrin IL

  • This Afternoon

    This Afternoon: Mostly sunny, with a steady temperature around 72. Calm wind becoming north northeast around 6 mph.

    High: 72 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 57. North northeast wind around 5 mph becoming calm in the evening.

    Low: 57 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 73. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 73 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 58. Calm wind.

    Low: 58 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 74. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 74 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 55. Calm wind.

    Low: 55 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 76. Light northeast wind.

    High: 76 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 55. Calm wind.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 80. Calm wind becoming south around 6 mph in the afternoon.

    High: 80 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly sunny, with a steady temperature around 72. Calm wind becoming north northeast around 6 mph.
Tonight
Partly cloudy, with a low around 57. North northeast wind around 5 mph becoming calm in the evening.
Saturday
Partly sunny, with a high near 73. Calm wind becoming northeast around 5 mph in the afternoon.
Saturday Night
Mostly cloudy, with a low around 58. Calm wind.
Sunday
Mostly sunny, with a high near 74. Calm wind becoming north northeast around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 55. Calm wind.
Monday
Sunny, with a high near 76. Light northeast wind.
Monday Night
Mostly clear, with a low around 55. Calm wind.
Tuesday
Sunny, with a high near 80. Calm wind becoming south around 6 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 65. Southeast wind 3 to 8 mph.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 80. South wind 9 to 11 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. South wind 6 to 8 mph.
Thursday
A chance of showers. Mostly cloudy, with a high near 78. South wind 8 to 11 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:
2:06 pm CDT Sep 25, 2026
Forecast Valid:
2pm CDT Sep 25, 2026-6pm CDT Oct 1, 2026
 
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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