Current conditions at
Marion - Williamson County Regional Airport (KMWA)
Lat: 37.77°NLon: 89.01°WElev: 486ft.
Fair
54°F
12°C
| Humidity | 100% |
| Wind Speed | Calm |
| Barometer | 30.17 in |
| Dewpoint | 54°F (12°C) |
| Visibility | 10.00 mi |
| Last update | 4 Oct 6:15 am CDT |
Extended Forecast for
Simpson IL
Today
High: 79 °F
Decreasing
CloudsTonight
Low: 52 °F
Clear
Monday
High: 75 °F
Sunny
Monday Night
Low: 45 °F
Clear
Tuesday
High: 78 °F
Sunny
Tuesday Night
Low: 49 °F
Clear
Wednesday
High: 83 °F
Sunny
Wednesday Night
Low: 52 °F
Clear
Thursday
High: 82 °F
Sunny
Detailed Forecast
Today
Mostly cloudy, then gradually becoming sunny, with a high near 79. Calm wind becoming north around 6 mph in the afternoon.
Tonight
Clear, with a low around 52. Light north wind.
Monday
Sunny, with a high near 75. Northeast wind 5 to 7 mph.
Monday Night
Clear, with a low around 45. Calm wind.
Tuesday
Sunny, with a high near 78. Calm wind.
Tuesday Night
Clear, with a low around 49. Calm wind.
Wednesday
Sunny, with a high near 83. Calm wind becoming west around 5 mph in the afternoon.
Wednesday Night
Clear, with a low around 52. Calm wind.
Thursday
Sunny, with a high near 82. Light north wind.
Thursday Night
Clear, with a low around 52. Calm wind.
Friday
Sunny, with a high near 84. Light and variable wind.
Friday Night
Mostly clear, with a low around 55. Calm wind.
Saturday
Mostly sunny, with a high near 84. Calm wind becoming east southeast 5 to 7 mph in the morning.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
Simpson IL
37.46°N 88.77°W
37.46°N 88.77°W
6:01 am CDT Oct 4, 2026
6am CDT Oct 4, 2026-6pm CDT Oct 10, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
