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.

Overcast

26°F

-3°C

Humidity 62%
Wind Speed SW 5 mph
Barometer 30.24 in
Dewpoint 14°F (-10°C)
Visibility 10.00 mi
Wind Chill20°F (-7°C)
Last update 2 Feb 12:35 am CST
Extended Forecast for

Johnston City IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 19. South southwest wind 5 to 7 mph.

    Low: 19 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 39. South southwest wind 3 to 6 mph.

    High: 39 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 25. South southeast wind around 5 mph becoming calm in the evening.

    Low: 25 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of rain, snow, and freezing rain before 3pm, then a chance of snow. Cloudy, with a high near 37. Calm wind becoming north northeast 5 to 8 mph in the morning. Chance of precipitation is 40%.

    High: 37 °F

    Chance Wintry
    Mix

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 21. North wind around 6 mph.

    Low: 21 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 31. North wind 5 to 8 mph.

    High: 31 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 14. Light north northwest wind.

    Low: 14 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 37. Calm wind becoming southwest 5 to 7 mph in the morning.

    High: 37 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 28. Southwest wind 7 to 9 mph.

    Low: 28 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 19. South southwest wind 5 to 7 mph.
Monday
Mostly sunny, with a high near 39. South southwest wind 3 to 6 mph.
Monday Night
Mostly cloudy, with a low around 25. South southeast wind around 5 mph becoming calm in the evening.
Tuesday
A chance of rain, snow, and freezing rain before 3pm, then a chance of snow. Cloudy, with a high near 37. Calm wind becoming north northeast 5 to 8 mph in the morning. Chance of precipitation is 40%.
Tuesday Night
Mostly cloudy, with a low around 21. North wind around 6 mph.
Wednesday
Partly sunny, with a high near 31. North wind 5 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 14. Light north northwest wind.
Thursday
Mostly sunny, with a high near 37. Calm wind becoming southwest 5 to 7 mph in the morning.
Thursday Night
Partly cloudy, with a low around 28. Southwest wind 7 to 9 mph.
Friday
Mostly sunny, with a high near 47. West southwest wind 7 to 11 mph becoming north northwest in the afternoon.
Friday Night
Partly cloudy, with a low around 22. North wind around 6 mph.
Saturday
Sunny, with a high near 36. North wind 5 to 7 mph becoming east in the afternoon.
Saturday Night
Partly cloudy, with a low around 24. East wind 5 to 7 mph becoming south southeast after midnight.
Sunday
Mostly sunny, with a high near 41. South southeast wind 6 to 8 mph becoming west southwest in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Johnston City IL
 37.82°N 88.91°W
Last Update:
10:06 pm CST Feb 1, 2026
Forecast Valid:
12am CST Feb 2, 2026-6pm CST Feb 8, 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