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.

Fair

78°F

26°C

Humidity 67%
Wind Speed NE 3 mph
Barometer 29.95 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 29 Jul 7:55 pm CDT
Extended Forecast for

Herrin ILSimilar City Names

  • Tonight

    Tonight: Clear, with a low around 64. Light northeast wind.

    Low: 64 °F

    Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 89. East wind 3 to 6 mph.

    High: 89 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 65. East southeast wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Increasing clouds, with a high near 88. South wind 3 to 8 mph. Chance of precipitation is 40%.

    High: 88 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 68. South southeast wind 6 to 8 mph. Chance of precipitation is 90%.

    Low: 68 °F

    Showers

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83. West southwest wind 8 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 83 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 66. North wind 6 to 13 mph.

    Low: 66 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. North wind 8 to 13 mph, with gusts as high as 18 mph.

    High: 84 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 66. North northeast wind 5 to 8 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 64. Light northeast wind.
Thursday
Mostly sunny, with a high near 89. East wind 3 to 6 mph.
Thursday Night
Partly cloudy, with a low around 65. East southeast wind around 5 mph becoming calm in the evening.
Friday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Increasing clouds, with a high near 88. South wind 3 to 8 mph. Chance of precipitation is 40%.
Friday Night
Showers and possibly a thunderstorm. Low around 68. South southeast wind 6 to 8 mph. Chance of precipitation is 90%.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 83. West southwest wind 8 to 13 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 66. North wind 6 to 13 mph.
Sunday
A slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84. North wind 8 to 13 mph, with gusts as high as 18 mph.
Sunday Night
Mostly clear, with a low around 66. North northeast wind 5 to 8 mph becoming calm in the evening.
Monday
A slight chance of showers and thunderstorms after 1pm. Sunny, with a high near 87. Northeast wind 3 to 7 mph.
Monday Night
Mostly clear, with a low around 67. East northeast wind around 5 mph becoming calm in the evening.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Calm wind becoming east northeast around 5 mph in the afternoon.
Tuesday Night
Partly cloudy, with a low around 69. Calm wind.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Calm wind becoming west around 5 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Herrin ILSimilar City Names
 37.8°N 89.03°W
Last Update:
5:11 pm CDT Jul 29, 2026
Forecast Valid:
8pm CDT Jul 29, 2026-6pm CDT Aug 5, 2026
 
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Additional Resources

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