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.

Mostly Cloudy

66°F

19°C

Humidity 83%
Wind Speed S 9 mph
Barometer 29.98 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 1 Apr 6:45 am CDT
Extended Forecast for

Herrin IL

  • Today

    Today: A chance of showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 79. Southwest wind 6 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    High: 79 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tonight

    Tonight: A chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Mostly cloudy, with a low around 66. South wind 7 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    Showers

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. Breezy, with a south wind 16 to 24 mph, with gusts as high as 38 mph. Chance of precipitation is 60%.

    High: 80 °F

    Breezy.
    Mostly Cloudy
    then Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 65. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 70%.

    Low: 65 °F

    Showers
    Likely and
    Breezy

  • Friday

    Friday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. South wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.

    High: 82 °F

    Showers
    Likely

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 61. South wind 10 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.

    Low: 61 °F

    Chance
    T-storms then
    Showers
    Likely

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 70. South wind around 14 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%.

    High: 70 °F

    Showers

  • Saturday Night

    Saturday Night: A chance of showers, mainly before 1am. Partly cloudy, with a low around 41. Northwest wind 10 to 13 mph, with gusts as high as 20 mph.

    Low: 41 °F

    Chance
    Showers

  • Sunday

    Sunday: Sunny, with a high near 59. Northwest wind 9 to 14 mph, with gusts as high as 21 mph.

    High: 59 °F

    Sunny

Detailed Forecast

Today
A chance of showers and thunderstorms before noon, then showers likely and possibly a thunderstorm between noon and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 79. Southwest wind 6 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Tonight
A chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Mostly cloudy, with a low around 66. South wind 7 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 30%.
Thursday
Showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. Breezy, with a south wind 16 to 24 mph, with gusts as high as 38 mph. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm. Partly cloudy, with a low around 65. Breezy, with a south southwest wind 10 to 20 mph, with gusts as high as 29 mph. Chance of precipitation is 70%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. South wind 10 to 15 mph, with gusts as high as 23 mph. Chance of precipitation is 70%.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 61. South wind 10 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.
Saturday
Showers and possibly a thunderstorm. High near 70. South wind around 14 mph becoming west in the afternoon. Winds could gust as high as 22 mph. Chance of precipitation is 90%.
Saturday Night
A chance of showers, mainly before 1am. Partly cloudy, with a low around 41. Northwest wind 10 to 13 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 59. Northwest wind 9 to 14 mph, with gusts as high as 21 mph.
Sunday Night
Mostly clear, with a low around 36. North northwest wind 5 to 9 mph becoming calm after midnight.
Monday
Sunny, with a high near 65. Calm wind becoming southeast around 6 mph in the morning.
Monday Night
Partly cloudy, with a low around 43. Light southwest wind.
Tuesday
Sunny, with a high near 63. North wind 5 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:
6:42 am CDT Apr 1, 2026
Forecast Valid:
7am CDT Apr 1, 2026-6pm CDT Apr 7, 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