Current conditions at
Marion - Williamson County Regional Airport (KMWA)
Lat: 37.77°NLon: 89.01°WElev: 486ft.
Fair
25°F
-4°C
| Humidity | 59% |
| Wind Speed | Calm |
| Barometer | 30.45 in |
| Dewpoint | 12°F (-11°C) |
| Visibility | 10.00 mi |
| Last update | 23 Feb 6:45 pm CST |
Extended Forecast for
Simpson IL
Tonight
Low: 19 °F
Mostly Clear
Tuesday
High: 49 °F
Mostly Sunny
then Mostly
Cloudy and
BreezyTuesday Night
Low: 40 °F
Mostly Cloudy
Wednesday
High: 57 °F
Mostly Cloudy
Wednesday Night
Low: 42 °F
Slight Chance
Showers then
Chance
ShowersThursday
High: 53 °F
Chance
Showers then
Slight Chance
ShowersThursday Night
Low: 33 °F
Partly Cloudy
Friday
High: 60 °F
Sunny
Friday Night
Low: 38 °F
Clear
Detailed Forecast
Tonight
Mostly clear, with a low around 19. Northwest wind around 5 mph becoming calm in the evening.
Tuesday
Partly sunny, with a high near 49. Breezy, with a light south wind becoming south southwest 15 to 20 mph in the morning. Winds could gust as high as 34 mph.
Tuesday Night
Mostly cloudy, with a low around 40. South southwest wind 8 to 13 mph becoming light southwest after midnight. Winds could gust as high as 28 mph.
Wednesday
Mostly cloudy, with a high near 57. Calm wind becoming west southwest around 5 mph.
Wednesday Night
A 50 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 42. Calm wind becoming east around 5 mph after midnight.
Thursday
A 50 percent chance of showers, mainly before noon. Partly sunny, with a high near 53. North wind 5 to 7 mph.
Thursday Night
Partly cloudy, with a low around 33. Light and variable wind.
Friday
Sunny, with a high near 60. Calm wind becoming south southwest around 5 mph.
Friday Night
Clear, with a low around 38. Calm wind.
Saturday
Sunny, with a high near 66. Calm wind becoming south southwest 5 to 7 mph in the morning.
Saturday Night
Partly cloudy, with a low around 37. South wind around 6 mph becoming north after midnight.
Sunday
A slight chance of showers. Partly sunny, with a high near 55. Northeast wind 6 to 8 mph.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 38. East northeast wind around 6 mph.
Monday
A chance of showers. Mostly cloudy, with a high near 56. East wind 6 to 8 mph becoming west in the afternoon.
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Simpson IL
37.46°N 88.77°W
37.46°N 88.77°W
5:21 pm CST Feb 23, 2026
7pm CST Feb 23, 2026-6pm CST Mar 2, 2026
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