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.

Mostly Cloudy

45°F

7°C

Humidity 81%
Wind Speed Calm
Barometer 30.11 in
Dewpoint 39°F (4°C)
Visibility 10.00 mi
Last update 1 Nov 6:45 am CDT
Extended Forecast for

Johnston City IL

Freeze Watch November 2, 01:00am until November 2, 07:00am
Click here for hazard details and duration
Freeze Watch

  • Today

    Today: A 50 percent chance of showers, mainly after noon. Cloudy, with a high near 53. Calm wind becoming west around 6 mph in the afternoon.

    High: 53 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Tonight

    Tonight: A 30 percent chance of showers, mainly before 8pm. Patchy frost after 1am. Otherwise, mostly cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Chance
    Showers then
    Patchy Frost

  • Sunday

    Sunday: Areas of frost before 9am. Otherwise, sunny, with a high near 55. Calm wind becoming north around 6 mph in the morning.

    High: 55 °F

    Areas Frost
    then Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 34. Light and variable wind.

    Low: 34 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 63. Southwest wind 5 to 10 mph.

    High: 63 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 38. Light west southwest wind.

    Low: 38 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 66. Light south southeast wind becoming south 5 to 10 mph in the morning.

    High: 66 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 48. South wind 6 to 8 mph.

    Low: 48 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 70. South southwest wind 9 to 13 mph.

    High: 70 °F

    Sunny

Detailed Forecast

Today
A 50 percent chance of showers, mainly after noon. Cloudy, with a high near 53. Calm wind becoming west around 6 mph in the afternoon.
Tonight
A 30 percent chance of showers, mainly before 8pm. Patchy frost after 1am. Otherwise, mostly cloudy, with a low around 34. Calm wind.
Sunday
Areas of frost before 9am. Otherwise, sunny, with a high near 55. Calm wind becoming north around 6 mph in the morning.
Sunday Night
Clear, with a low around 34. Light and variable wind.
Monday
Sunny, with a high near 63. Southwest wind 5 to 10 mph.
Monday Night
Mostly clear, with a low around 38. Light west southwest wind.
Tuesday
Mostly sunny, with a high near 66. Light south southeast wind becoming south 5 to 10 mph in the morning.
Tuesday Night
Mostly clear, with a low around 48. South wind 6 to 8 mph.
Wednesday
Sunny, with a high near 70. South southwest wind 9 to 13 mph.
Wednesday Night
Clear, with a low around 43. West wind around 6 mph becoming calm in the evening.
Thursday
Sunny, with a high near 67. Light and variable wind becoming south southeast 5 to 8 mph in the morning.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 50. South southeast wind 6 to 9 mph.
Friday
A chance of showers. Partly sunny, with a high near 67. South wind 10 to 14 mph becoming west in the afternoon. Winds could gust as high as 21 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Johnston City IL
 37.85°N 88.94°W
Last Update:
4:16 am CDT Nov 1, 2025
Forecast Valid:
7am CDT Nov 1, 2025-6pm CST Nov 7, 2025
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation