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Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Overcast

62°F

17°C

Humidity 98%
Wind Speed Calm
Barometer 30.13 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 20 May 9:15 pm CDT
Extended Forecast for

Herrin ILSimilar City Names

  • Tonight

    Tonight: Mostly cloudy, with a low around 56. North northeast wind 3 to 5 mph.

    Low: 56 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 73. Northeast wind 6 to 8 mph.

    High: 73 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 60. East northeast wind 6 to 8 mph.

    Low: 60 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers and possibly a thunderstorm. High near 75. East northeast wind around 8 mph becoming southeast in the afternoon. Chance of precipitation is 90%.

    High: 75 °F

    Showers

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 1am, then a slight chance of showers. Mostly cloudy, with a low around 63. South southeast wind 3 to 7 mph. Chance of precipitation is 70%.

    Low: 63 °F

    Showers
    Likely

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Southwest wind 3 to 5 mph.

    High: 82 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 40%.

    Low: 63 °F

    Chance
    T-storms

  • Sunday

    Sunday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. Light south wind.

    High: 80 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 56. North northeast wind 3 to 5 mph.
Thursday
Mostly cloudy, with a high near 73. Northeast wind 6 to 8 mph.
Thursday Night
A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 60. East northeast wind 6 to 8 mph.
Friday
Showers and possibly a thunderstorm. High near 75. East northeast wind around 8 mph becoming southeast in the afternoon. Chance of precipitation is 90%.
Friday Night
Showers likely and possibly a thunderstorm before 1am, then a slight chance of showers. Mostly cloudy, with a low around 63. South southeast wind 3 to 7 mph. Chance of precipitation is 70%.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82. Southwest wind 3 to 5 mph.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 40%.
Sunday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 80. Light south wind.
Sunday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Calm wind.
Memorial Day
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 80. Calm wind becoming southeast around 6 mph in the morning.
Monday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 66. East southeast wind around 5 mph becoming calm in the evening.
Tuesday
Showers and thunderstorms likely. Mostly cloudy, with a high near 82. South southeast wind 5 to 7 mph.
Tuesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Southeast wind 3 to 6 mph.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 85. South wind 3 to 8 mph.
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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:
8:16 pm CDT May 20, 2026
Forecast Valid:
9pm CDT May 20, 2026-6pm CDT May 27, 2026
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation