National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

54°F

12°C

Humidity 67%
Wind Speed N 12 G 17 mph
Barometer 29.86 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 11 Nov 10:35 pm CST
Extended Forecast for

Johnston City IL

  • Tonight

    Tonight: Mostly clear, with a low around 41. Northwest wind 7 to 9 mph, with gusts as high as 24 mph.

    Low: 41 °F

    Mostly Clear

  • Thursday

    Thursday: A slight chance of showers between noon and 5pm. Partly sunny, with a high near 55. North northwest wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 20%.

    High: 55 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 31. North northwest wind 6 to 13 mph, with gusts as high as 18 mph.

    Low: 31 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 48. North northwest wind 8 to 13 mph, with gusts as high as 18 mph.

    High: 48 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 26. North northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 26 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 50. Light north northwest wind.

    High: 50 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 26. Calm wind.

    Low: 26 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 53. Calm wind becoming east around 5 mph.

    High: 53 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 30. Calm wind.

    Low: 30 °F

    Partly Cloudy

Detailed Forecast

Tonight
Mostly clear, with a low around 41. Northwest wind 7 to 9 mph, with gusts as high as 24 mph.
Thursday
A slight chance of showers between noon and 5pm. Partly sunny, with a high near 55. North northwest wind 6 to 11 mph increasing to 13 to 18 mph in the afternoon. Winds could gust as high as 24 mph. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 31. North northwest wind 6 to 13 mph, with gusts as high as 18 mph.
Friday
Mostly sunny, with a high near 48. North northwest wind 8 to 13 mph, with gusts as high as 18 mph.
Friday Night
Mostly clear, with a low around 26. North northwest wind 5 to 7 mph becoming calm in the evening.
Saturday
Sunny, with a high near 50. Light north northwest wind.
Saturday Night
Mostly clear, with a low around 26. Calm wind.
Sunday
Mostly sunny, with a high near 53. Calm wind becoming east around 5 mph.
Sunday Night
Partly cloudy, with a low around 30. Calm wind.
Monday
Sunny, with a high near 53. Calm wind becoming east northeast 5 to 7 mph.
Monday Night
Mostly clear, with a low around 28. Calm wind.
Tuesday
Sunny, with a high near 55. Calm wind becoming east northeast around 6 mph.
Tuesday Night
Mostly clear, with a low around 29. Calm wind.
Wednesday
Sunny, with a high near 60. Calm wind becoming southeast around 6 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Johnston City IL
 37.82°N 88.94°W
Last Update:
7:06 pm CST Nov 11, 2026
Forecast Valid:
10pm CST Nov 11, 2026-6pm CST Nov 18, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation