Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

21°F

-6°C

Humidity 86%
Wind Speed N 12 mph
Barometer 30.36 in
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill9°F (-13°C)
Last update 4 Feb 7:47 am CST
Extended Forecast for

Johnston City IL

  • Today

    Today: Partly sunny, with a high near 32. North wind 7 to 10 mph.

    High: 32 °F

    Partly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 14. North wind 5 to 7 mph becoming calm  in the evening.

    Low: 14 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 35. Calm wind becoming south southwest 5 to 8 mph in the afternoon.

    High: 35 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 29. West southwest wind 6 to 8 mph.

    Low: 29 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 50. West southwest wind 6 to 13 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph.

    High: 50 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 26. North northwest wind 5 to 7 mph.

    Low: 26 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 42. North northeast wind around 6 mph becoming east southeast in the afternoon.

    High: 42 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 28. South southeast wind 3 to 6 mph.

    Low: 28 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 51. South wind 5 to 8 mph becoming north in the afternoon.

    High: 51 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 32. North wind 7 to 10 mph.
Tonight
Partly cloudy, with a low around 14. North wind 5 to 7 mph becoming calm in the evening.
Thursday
Mostly cloudy, with a high near 35. Calm wind becoming south southwest 5 to 8 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 29. West southwest wind 6 to 8 mph.
Friday
Mostly sunny, with a high near 50. West southwest wind 6 to 13 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph.
Friday Night
Partly cloudy, with a low around 26. North northwest wind 5 to 7 mph.
Saturday
Sunny, with a high near 42. North northeast wind around 6 mph becoming east southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 28. South southeast wind 3 to 6 mph.
Sunday
Mostly sunny, with a high near 51. South wind 5 to 8 mph becoming north in the afternoon.
Sunday Night
Partly cloudy, with a low around 29. Light north northeast wind.
Monday
Mostly sunny, with a high near 50. Calm wind becoming south southwest around 6 mph in the afternoon.
Monday Night
Mostly cloudy, with a low around 37. South wind 3 to 6 mph.
Tuesday
A slight chance of showers. Partly sunny, with a high near 58. South wind 6 to 9 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Johnston City IL
 37.82°N 88.91°W
7:52 am CST Feb 4, 2026
8am CST Feb 4, 2026-6pm CST Feb 10, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database