Hazardous Weather Conditions
Current conditions at
Marion - Williamson County Regional Airport (KMWA)
Lat: 37.77°NLon: 89.01°WElev: 486ft.
Fair
93°F
34°C
| Humidity | 53% |
| Wind Speed | S 5 mph |
| Barometer | 30.06 in |
| Dewpoint | 73°F (23°C) |
| Visibility | 10.00 mi |
| Heat Index | 103°F (39°C) |
| Last update | 2 Sep 11:47 am CDT |
Extended Forecast for
2 Miles NNE Herrin IL
Extreme Heat Warning September 2, 01:17pm until September 5, 08:00pm
NOW until 8:00pm Sat
Extreme Heat Warning
This Afternoon
High: 100 °F
Hot
Tonight
Low: 77 °F
Mostly Clear
Thursday
High: 99 °F
Hot
Thursday Night
Low: 76 °F
Clear
Friday
High: 100 °F
Hot
Friday Night
Low: 76 °F
Mostly Clear
Saturday
High: 99 °F
Sunny then
Slight Chance
T-stormsSaturday Night
Low: 72 °F
Slight Chance
Showers
Detailed Forecast
This Afternoon
Sunny and hot, with a high near 100. Heat index values as high as 106. South southwest wind around 8 mph.
Tonight
Mostly clear, with a low around 77. South wind around 5 mph becoming calm in the evening.
Thursday
Sunny and hot, with a high near 99. Heat index values as high as 105. Calm wind becoming west southwest 5 to 7 mph in the morning.
Thursday Night
Clear, with a low around 76. Light south wind.
Friday
Sunny and hot, with a high near 100. Light and variable wind.
Friday Night
Mostly clear, with a low around 76. Calm wind.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny and hot, with a high near 99. Calm wind becoming west northwest around 5 mph in the afternoon.
Saturday Night
A slight chance of showers before 1am. Partly cloudy, with a low around 72. Calm wind.
Sunday
Sunny, with a high near 96. Calm wind becoming north northeast 5 to 7 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 70. East northeast wind around 6 mph becoming calm in the evening.
Labor Day
Sunny, with a high near 95. Calm wind becoming east 5 to 7 mph in the afternoon.
Monday Night
Partly cloudy, with a low around 70. North northeast wind around 6 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 95. Calm wind becoming south 5 to 8 mph in the morning.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
2 Miles NNE Herrin IL
37.83°N 89.03°W
37.83°N 89.03°W
10:46 am CDT Sep 2, 2026
1pm CDT Sep 2, 2026-6pm CDT Sep 8, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
