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.

Partly Cloudy and Breezy

75°F

24°C

Humidity 54%
Wind Speed SW 24 G 39 mph
Barometer 30.00 in
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 31 Mar 10:47 am CDT
Extended Forecast for

Herrin IL

  • Today

    Today: Mostly sunny, with a high near 84. Breezy, with a south southwest wind around 21 mph, with gusts as high as 32 mph.

    High: 84 °F

    Mostly Sunny
    and Breezy

  • Tonight

    Tonight: A 30 percent chance of showers, mainly after 4am. Partly cloudy, with a low around 65. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.

    Low: 65 °F

    Partly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers. Partly sunny, with a high near 82. South southwest wind 8 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.

    High: 82 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A slight chance of showers before 7pm, then a slight chance of showers after 10pm. Mostly cloudy, with a low around 66. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 81. Breezy, with a south wind 15 to 21 mph, with gusts as high as 31 mph. Chance of precipitation is 70%.

    High: 81 °F

    Breezy.
    Chance
    Showers then
    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers and possibly a thunderstorm. Low around 64. South wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%.

    Low: 64 °F

    Showers

  • Friday

    Friday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 81. South wind 9 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.

    High: 81 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South wind around 11 mph, with gusts as high as 20 mph.

    Low: 63 °F

    Chance
    T-storms

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 74. South wind 13 to 18 mph, with gusts as high as 26 mph.

    High: 74 °F

    Showers
    Likely

Detailed Forecast

Today
Mostly sunny, with a high near 84. Breezy, with a south southwest wind around 21 mph, with gusts as high as 32 mph.
Tonight
A 30 percent chance of showers, mainly after 4am. Partly cloudy, with a low around 65. South southwest wind 10 to 14 mph, with gusts as high as 22 mph.
Wednesday
A chance of showers and thunderstorms between 1pm and 4pm, then a slight chance of showers. Partly sunny, with a high near 82. South southwest wind 8 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 50%.
Wednesday Night
A slight chance of showers before 7pm, then a slight chance of showers after 10pm. Mostly cloudy, with a low around 66. South wind 10 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 20%.
Thursday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 81. Breezy, with a south wind 15 to 21 mph, with gusts as high as 31 mph. Chance of precipitation is 70%.
Thursday Night
Showers and possibly a thunderstorm. Low around 64. South wind 10 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 80%.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 81. South wind 9 to 14 mph, with gusts as high as 20 mph. Chance of precipitation is 60%.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South wind around 11 mph, with gusts as high as 20 mph.
Saturday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 74. South wind 13 to 18 mph, with gusts as high as 26 mph.
Saturday Night
A chance of showers. Mostly cloudy, with a low around 42. West northwest wind 11 to 15 mph, with gusts as high as 20 mph.
Sunday
A chance of showers. Partly sunny, with a high near 59. Northwest wind around 14 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 36. North wind 6 to 10 mph.
Monday
Sunny, with a high near 62. North wind 6 to 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Herrin IL
 37.81°N 89.06°W
Last Update:
10:22 am CDT Mar 31, 2026
Forecast Valid:
11am CDT Mar 31, 2026-6pm CDT Apr 6, 2026
 
Forecast Discussion
 
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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