Hazardous Weather Conditions
Current conditions at
Marion - Williamson County Regional Airport (KMWA)
Lat: 37.77°NLon: 89.01°WElev: 486ft.
Fair
81°F
27°C
| Humidity | 70% |
| Wind Speed | Calm |
| Barometer | 30.11 in |
| Dewpoint | 70°F (21°C) |
| Visibility | 10.00 mi |
| Heat Index | 85°F (29°C) |
| Last update | 5 Aug 9:45 am CDT |
Extended Forecast for
Simpson IL
This Afternoon
High: 90 °F
Sunny
Tonight
Low: 69 °F
Partly Cloudy
Thursday
High: 88 °F
Slight Chance
T-stormsThursday Night
Low: 71 °F
Mostly Cloudy
then Chance
T-stormsFriday
High: 89 °F
Showers
LikelyFriday Night
Low: 71 °F
Chance
T-storms then
Showers
LikelySaturday
High: 91 °F
Chance
T-stormsSaturday Night
Low: 69 °F
Mostly Clear
Sunday
High: 91 °F
Sunny
Detailed Forecast
This Afternoon
Sunny, with a high near 90. Light south southwest wind.
Tonight
Partly cloudy, with a low around 69. Calm wind.
Thursday
A 20 percent chance of showers and thunderstorms, mainly between noon and 1pm. Partly sunny, with a high near 88. Calm wind becoming southeast around 6 mph in the afternoon.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly after 4am. Mostly cloudy, with a low around 71. Calm wind.
Friday
A chance of showers and thunderstorms before 7am, then showers likely and possibly a thunderstorm between 7am and 1pm, then a slight chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. Calm wind becoming south southwest around 6 mph in the afternoon. Chance of precipitation is 60%.
Friday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 71. Calm wind. Chance of precipitation is 60%.
Saturday
A 30 percent chance of showers and thunderstorms, mainly before 7am. Mostly sunny, with a high near 91. Calm wind becoming southwest around 5 mph.
Saturday Night
Mostly clear, with a low around 69. 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 71. Calm wind.
Monday
Sunny, with a high near 92. Light south southwest wind increasing to 5 to 9 mph in the morning.
Monday Night
Mostly clear, with a low around 74. South southwest wind 3 to 6 mph.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 93. Southwest wind 5 to 9 mph.
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Simpson IL
37.46°N 88.77°W
37.46°N 88.77°W
11:20 am CDT Aug 5, 2026
12pm CDT Aug 5, 2026-6pm CDT Aug 11, 2026
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