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.

Partly Cloudy

70°F

21°C

Humidity 82%
Wind Speed Calm
Barometer 30.01 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 25 Jun 12:55 am CDT
Extended Forecast for

Herrin IL

  • Overnight

    Overnight: A slight chance of showers, then a chance of showers and thunderstorms after 5am. Partly cloudy, with a steady temperature around 71. Calm wind. Chance of precipitation is 30%.

    Low: 71 °F

    Chance
    Showers

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 88. Calm wind becoming southwest around 6 mph in the afternoon.

    High: 88 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 4am, then showers likely and possibly a thunderstorm between 4am and 5am, then a chance of showers and thunderstorms after 5am. Increasing clouds, with a low around 70. Light south wind. Chance of precipitation is 60%.

    Low: 70 °F

    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 87. South wind 5 to 10 mph. Chance of precipitation is 70%.

    High: 87 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 72. South southwest wind 5 to 7 mph. Chance of precipitation is 60%.

    Low: 72 °F

    Showers
    Likely

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 90. Southwest wind 6 to 8 mph. Chance of precipitation is 60%.

    High: 90 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South wind around 6 mph.

    Low: 73 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 96. South southwest wind 7 to 13 mph, with gusts as high as 18 mph.

    High: 96 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 75. South southwest wind 5 to 10 mph.

    Low: 75 °F

    Clear

Detailed Forecast

Overnight
A slight chance of showers, then a chance of showers and thunderstorms after 5am. Partly cloudy, with a steady temperature around 71. Calm wind. Chance of precipitation is 30%.
Thursday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 88. Calm wind becoming southwest around 6 mph in the afternoon.
Thursday Night
Showers and thunderstorms likely before 4am, then showers likely and possibly a thunderstorm between 4am and 5am, then a chance of showers and thunderstorms after 5am. Increasing clouds, with a low around 70. Light south wind. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 87. South wind 5 to 10 mph. Chance of precipitation is 70%.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 72. South southwest wind 5 to 7 mph. Chance of precipitation is 60%.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 90. Southwest wind 6 to 8 mph. Chance of precipitation is 60%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73. South wind around 6 mph.
Sunday
Sunny, with a high near 96. South southwest wind 7 to 13 mph, with gusts as high as 18 mph.
Sunday Night
Clear, with a low around 75. South southwest wind 5 to 10 mph.
Monday
Sunny and hot, with a high near 98. South southwest wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 76. South wind 5 to 8 mph becoming calm after midnight.
Tuesday
Sunny and hot, with a high near 100. Calm wind becoming south southwest around 6 mph in the morning.
Tuesday Night
Clear, with a low around 77. South wind 5 to 7 mph becoming calm in the evening.
Wednesday
Sunny and hot, with a high near 100. Calm wind becoming southwest around 5 mph in the afternoon.
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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:
9:51 pm CDT Jun 24, 2026
Forecast Valid:
1am CDT Jun 25, 2026-6pm CDT Jul 1, 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