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.

Overcast

81°F

27°C

Humidity 79%
Wind Speed S 12 mph
Barometer 30.01 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 15 Oct 11:45 am CDT
Extended Forecast for

Herrin IL

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm. Mostly sunny, with a high near 88. Southwest wind 6 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

    High: 88 °F

    Showers
    Likely

  • Tonight

    Tonight: A chance of showers and thunderstorms. Increasing clouds, with a low around 49. West southwest wind 7 to 12 mph becoming northwest 13 to 18 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 50%.

    Low: 49 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A 30 percent chance of showers before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 59. Breezy, with a northwest wind 18 to 20 mph, with gusts as high as 28 mph.

    High: 59 °F

    Breezy.
    Chance
    Showers then
    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 41. North wind 13 to 16 mph, with gusts as high as 21 mph.

    Low: 41 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 61. North northeast wind 9 to 11 mph.

    High: 61 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 37. Calm wind.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 67. Calm wind becoming southeast around 6 mph in the morning.

    High: 67 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 40. Calm wind.

    Low: 40 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 71. Calm wind becoming south around 6 mph in the afternoon.

    High: 71 °F

    Sunny

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 4pm. Mostly sunny, with a high near 88. Southwest wind 6 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Tonight
A chance of showers and thunderstorms. Increasing clouds, with a low around 49. West southwest wind 7 to 12 mph becoming northwest 13 to 18 mph after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 50%.
Friday
A 30 percent chance of showers before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 59. Breezy, with a northwest wind 18 to 20 mph, with gusts as high as 28 mph.
Friday Night
Mostly cloudy, with a low around 41. North wind 13 to 16 mph, with gusts as high as 21 mph.
Saturday
Sunny, with a high near 61. North northeast wind 9 to 11 mph.
Saturday Night
Clear, with a low around 37. Calm wind.
Sunday
Sunny, with a high near 67. Calm wind becoming southeast around 6 mph in the morning.
Sunday Night
Mostly clear, with a low around 40. Calm wind.
Monday
Sunny, with a high near 71. Calm wind becoming south around 6 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 43. Calm wind.
Tuesday
Mostly sunny, with a high near 74. Light and variable wind.
Tuesday Night
Mostly clear, with a low around 45. Calm wind.
Wednesday
Sunny, with a high near 77. Calm wind becoming southeast around 5 mph in the afternoon.
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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:
11:31 am CDT Oct 15, 2026
Forecast Valid:
12pm CDT Oct 15, 2026-6pm CDT Oct 21, 2026
 
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Additional Resources

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Chance of Precipitation