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

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Overcast

61°F

16°C

Humidity 77%
Wind Speed W 10 mph
Barometer 29.82 in
Dewpoint 54°F (12°C)
Visibility 10.00 mi
Last update 4 Nov 11:45 am CST
Extended Forecast for

Johnston City IL

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 65. West wind 6 to 11 mph.

    High: 65 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy during the early evening, then gradual clearing, with a low around 44. West southwest wind around 5 mph becoming calm in the evening.

    Low: 44 °F

    Gradual
    Clearing

  • Thursday

    Thursday: Sunny, with a high near 69. Light southwest wind becoming west southwest 5 to 9 mph.

    High: 69 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 45. Calm wind.

    Low: 45 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 61. Light northwest wind becoming north northwest 6 to 11 mph in the morning.

    High: 61 °F

    Partly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 36. North wind 5 to 8 mph becoming calm in the evening.

    Low: 36 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 57. Calm wind becoming north around 6 mph.

    High: 57 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 34. Calm wind.

    Low: 34 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 62. Calm wind becoming northwest 5 to 7 mph.

    High: 62 °F

    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 65. West wind 6 to 11 mph.
Tonight
Mostly cloudy during the early evening, then gradual clearing, with a low around 44. West southwest wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 69. Light southwest wind becoming west southwest 5 to 9 mph.
Thursday Night
Partly cloudy, with a low around 45. Calm wind.
Friday
Partly sunny, with a high near 61. Light northwest wind becoming north northwest 6 to 11 mph in the morning.
Friday Night
Partly cloudy, with a low around 36. North wind 5 to 8 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 57. Calm wind becoming north around 6 mph.
Saturday Night
Partly cloudy, with a low around 34. Calm wind.
Sunday
Sunny, with a high near 62. Calm wind becoming northwest 5 to 7 mph.
Sunday Night
Clear, with a low around 34. Calm wind.
Monday
Sunny, with a high near 66. Calm wind becoming southwest 5 to 7 mph.
Monday Night
Clear, with a low around 38. Calm wind.
Tuesday
Sunny, with a high near 70. Calm wind becoming west around 6 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Johnston City IL
 37.82°N 88.91°W
Last Update:
10:31 am CST Nov 4, 2026
Forecast Valid:
12pm CST Nov 4, 2026-6pm CST Nov 10, 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