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

73°F

23°C

Humidity 78%
Wind Speed NE 7 mph
Barometer 29.92 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Last update 21 Sep 4:35 am CDT
Extended Forecast for

Herrin ILSimilar City Names

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. North northeast wind around 5 mph.

    Low: 69 °F

    Slight Chance
    T-storms

  • Monday

    Monday: A slight chance of showers and thunderstorms between 1pm and 2pm. Mostly cloudy, with a high near 84. North northeast wind 3 to 8 mph. Chance of precipitation is 20%.

    High: 84 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 62. North northeast wind 5 to 8 mph.

    Low: 62 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 79. North northeast wind 8 to 10 mph.

    High: 79 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 58. North northeast wind 5 to 11 mph.

    Low: 58 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 77. North wind 7 to 11 mph.

    High: 77 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 56. North northeast wind 5 to 9 mph becoming light after midnight.

    Low: 56 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 78. Light north northeast wind increasing to 5 to 9 mph in the morning.

    High: 78 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 56. North northeast wind around 6 mph becoming calm in the evening.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69. North northeast wind around 5 mph.
Monday
A slight chance of showers and thunderstorms between 1pm and 2pm. Mostly cloudy, with a high near 84. North northeast wind 3 to 8 mph. Chance of precipitation is 20%.
Monday Night
Mostly cloudy, with a low around 62. North northeast wind 5 to 8 mph.
Tuesday
Partly sunny, with a high near 79. North northeast wind 8 to 10 mph.
Tuesday Night
Partly cloudy, with a low around 58. North northeast wind 5 to 11 mph.
Wednesday
Mostly sunny, with a high near 77. North wind 7 to 11 mph.
Wednesday Night
Partly cloudy, with a low around 56. North northeast wind 5 to 9 mph becoming light after midnight.
Thursday
Mostly sunny, with a high near 78. Light north northeast wind increasing to 5 to 9 mph in the morning.
Thursday Night
Mostly clear, with a low around 56. North northeast wind around 6 mph becoming calm in the evening.
Friday
Mostly sunny, with a high near 78. Light northeast wind increasing to 5 to 9 mph in the morning.
Friday Night
Partly cloudy, with a low around 55. Northeast wind around 6 mph becoming calm after midnight.
Saturday
Mostly sunny, with a high near 77. Calm wind becoming east northeast around 6 mph in the morning.
Saturday Night
Partly cloudy, with a low around 56. Light east northeast wind.
Sunday
Mostly sunny, with a high near 83. Calm wind becoming northeast 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:
2:41 am CDT Sep 21, 2026
Forecast Valid:
4am CDT Sep 21, 2026-6pm CDT Sep 27, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation