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

63°F

17°C

Humidity 88%
Wind Speed E 6 mph
Barometer 29.97 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 22 May 4:15 am CDT
Extended Forecast for

Herrin IL

  • Today

    Today: Showers likely before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Cloudy, with a high near 70. East northeast wind around 7 mph. Chance of precipitation is 70%.

    High: 70 °F

    Showers
    Likely

  • Tonight

    Tonight: A chance of showers and thunderstorms before 4am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 60. Northeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 50%.

    Low: 60 °F

    Chance
    Showers

  • Saturday

    Saturday: A 10 percent chance of showers before 7am. Partly sunny, with a high near 81. Light west southwest wind.

    High: 81 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 63. Calm wind.

    Low: 63 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Light and variable wind. Chance of precipitation is 60%.

    High: 82 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    Showers

  • Memorial Day

    Memorial Day: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Calm wind becoming east around 6 mph in the afternoon. Chance of precipitation is 40%.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

  • Monday Night

    Monday Night: A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 82. Southeast wind 3 to 8 mph.

    High: 82 °F

    Showers
    Likely

Detailed Forecast

Today
Showers likely before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Cloudy, with a high near 70. East northeast wind around 7 mph. Chance of precipitation is 70%.
Tonight
A chance of showers and thunderstorms before 4am, then a slight chance of showers after 5am. Mostly cloudy, with a low around 60. Northeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 50%.
Saturday
A 10 percent chance of showers before 7am. Partly sunny, with a high near 81. Light west southwest wind.
Saturday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 63. Calm wind.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 82. Light and variable wind. Chance of precipitation is 60%.
Sunday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%.
Memorial Day
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Calm wind becoming east around 6 mph in the afternoon. Chance of precipitation is 40%.
Monday Night
A chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 66. East wind around 5 mph becoming calm in the evening.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 82. Southeast wind 3 to 8 mph.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 68. Southeast wind 3 to 7 mph.
Wednesday
Showers and thunderstorms likely. Partly sunny, with a high near 85. South southeast wind 5 to 8 mph.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 69. Southeast wind around 6 mph becoming calm in the evening.
Thursday
Showers and thunderstorms likely. Partly sunny, with a high near 86. South southeast wind 3 to 7 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:
1:26 am CDT May 22, 2026
Forecast Valid:
4am CDT May 22, 2026-6pm CDT May 28, 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