Current conditions at
Marion - Williamson County Regional Airport (KMWA)
Lat: 37.77°NLon: 89.01°WElev: 486ft.
Fair
23°F
-5°C
| Humidity | 58% |
| Wind Speed | Calm |
| Barometer | 30.44 in |
| Dewpoint | 11°F (-12°C) |
| Visibility | 10.00 mi |
| Last update | 23 Feb 8:15 pm CST |
Extended Forecast for
Johnston City IL
Tonight

Low: 20 °F
Mostly Clear
Tuesday

High: 50 °F
Increasing
Clouds and
BreezyTuesday Night
Low: 40 °F
Mostly Cloudy
and Breezy
then Mostly
CloudyWednesday

High: 57 °F
Partly Sunny
Wednesday Night
Low: 40 °F
Slight Chance
Showers then
Chance
ShowersThursday
High: 52 °F
Chance
Showers then
Partly SunnyThursday Night

Low: 33 °F
Partly Cloudy
Friday

High: 61 °F
Sunny
Friday Night

Low: 39 °F
Clear
Detailed Forecast
Tonight
Mostly clear, with a low around 20. Calm wind becoming south around 5 mph after midnight.
Tuesday
Increasing clouds, with a high near 50. Breezy, with a south southwest wind 7 to 12 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 37 mph.
Tuesday Night
Mostly cloudy, with a low around 40. Breezy, with a southwest wind 15 to 20 mph decreasing to 6 to 11 mph after midnight. Winds could gust as high as 29 mph.
Wednesday
Partly sunny, with a high near 57. West southwest wind around 6 mph becoming northeast in the afternoon.
Wednesday Night
A 50 percent chance of showers, mainly after midnight. Mostly cloudy, with a low around 40. East wind 5 to 8 mph.
Thursday
A 50 percent chance of showers before noon. Partly sunny, with a high near 52. North northeast wind 7 to 10 mph.
Thursday Night
Partly cloudy, with a low around 33. North northwest wind around 6 mph becoming calm in the evening.
Friday
Sunny, with a high near 61. Calm wind becoming south southwest 5 to 8 mph in the morning.
Friday Night
Clear, with a low around 39. South southwest wind around 6 mph.
Saturday
Sunny, with a high near 66. South southwest wind 6 to 10 mph.
Saturday Night
Partly cloudy, with a low around 37. South wind around 9 mph becoming north after midnight.
Sunday
A chance of showers. Partly sunny, with a high near 53. East northeast wind 9 to 11 mph, with gusts as high as 18 mph.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 36. East northeast wind around 10 mph.
Monday
A chance of showers. Partly sunny, with a high near 54. North northeast wind 9 to 11 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph.
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ABOUT THIS FORECAST
Point Forecast:
Johnston City IL
37.82°N 88.91°W
37.82°N 88.91°W
5:21 pm CST Feb 23, 2026
8pm CST Feb 23, 2026-6pm CST Mar 2, 2026


