Hazardous Weather Conditions
Current conditions at
Marion - Williamson County Regional Airport (KMWA)
Lat: 37.77°NLon: 89.01°WElev: 486ft.
Mostly Cloudy
79°F
26°C
| Humidity | 74% |
| Wind Speed | NW 9 mph |
| Barometer | 30.13 in |
| Dewpoint | 70°F (21°C) |
| Visibility | 10.00 mi |
| Heat Index | 82°F (28°C) |
| Last update | 6 Aug 3:45 pm CDT |
Extended Forecast for
Simpson IL
This Afternoon
High: 85 °F
Slight Chance
T-stormsTonight
Low: 71 °F
Partly Cloudy
then Chance
T-stormsFriday
High: 89 °F
Chance
T-storms then
Chance
ShowersFriday Night
Low: 71 °F
Slight Chance
T-storms then
Chance
ShowersSaturday
High: 90 °F
Slight Chance
T-stormsSaturday Night
Low: 70 °F
Mostly Clear
Sunday
High: 91 °F
Sunny
Sunday Night
Low: 73 °F
Mostly Clear
Monday
High: 92 °F
Sunny
Detailed Forecast
This Afternoon
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 85. Light southeast wind.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 5am. Mostly cloudy, with a low around 71. Calm wind.
Friday
A 40 percent chance of showers and thunderstorms, mainly between 3pm and 4pm. Partly sunny, with a high near 89. Calm wind becoming south 5 to 7 mph in the afternoon.
Friday Night
A slight chance of showers and thunderstorms before midnight, then a chance of showers between midnight and 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. Light south southwest wind. Chance of precipitation is 30%.
Saturday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 90. Calm wind becoming west southwest around 5 mph.
Saturday Night
Mostly clear, with a low around 70. Calm wind.
Sunday
Sunny, with a high near 91. Calm wind becoming south southwest 5 to 7 mph in the morning.
Sunday Night
Mostly clear, with a low around 73. Calm wind.
Monday
Sunny, with a high near 92. Calm wind becoming southwest 5 to 9 mph in the morning.
Monday Night
Mostly clear, with a low around 74. South southwest wind 3 to 5 mph.
Tuesday
A slight chance of showers and thunderstorms. Sunny, with a high near 92. Southwest wind 5 to 9 mph.
Tuesday Night
Mostly clear, with a low around 74. South southwest wind 3 to 5 mph.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 90. West southwest wind 5 to 8 mph.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
Simpson IL
37.46°N 88.74°W
37.46°N 88.74°W
1:26 pm CDT Aug 6, 2026
4pm CDT Aug 6, 2026-6pm CDT Aug 12, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
