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

72°F

22°C

Humidity 94%
Wind Speed Calm
Barometer 30.19 in
Dewpoint 70°F (21°C)
Visibility 8.00 mi
Last update 5 Aug 8:45 am CDT
Extended Forecast for

Johnston City IL

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. Calm wind.

    High: 86 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: Patchy fog after 1am. Otherwise, mostly clear, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear
    then Patchy
    Fog

  • Wednesday

    Wednesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 89. Calm wind.

    High: 89 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 69. Calm wind.

    Low: 69 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 90. Light southeast wind.

    High: 90 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 70. Calm wind.

    Low: 70 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 92. Calm wind becoming south southeast around 6 mph in the afternoon.

    High: 92 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 71. Southeast wind around 5 mph becoming calm in the evening.

    Low: 71 °F

    Clear

  • Saturday

    Saturday: Sunny, with a high near 91. South southeast wind 3 to 7 mph.

    High: 91 °F

    Sunny

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. Calm wind.
Tonight
Patchy fog after 1am. Otherwise, mostly clear, with a low around 68. Calm wind.
Wednesday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 89. Calm wind.
Wednesday Night
Mostly clear, with a low around 69. Calm wind.
Thursday
Sunny, with a high near 90. Light southeast wind.
Thursday Night
Clear, with a low around 70. Calm wind.
Friday
Sunny, with a high near 92. Calm wind becoming south southeast around 6 mph in the afternoon.
Friday Night
Clear, with a low around 71. Southeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 91. South southeast wind 3 to 7 mph.
Saturday Night
Mostly clear, with a low around 72. South southeast wind around 6 mph becoming calm in the evening.
Sunday
A slight chance of showers and thunderstorms. Sunny, with a high near 91. South wind 3 to 6 mph.
Sunday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 73. South wind around 5 mph becoming calm in the evening.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. South southwest wind 3 to 7 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:
9:13 am CDT Aug 5, 2025
Forecast Valid:
9am CDT Aug 5, 2025-6pm CDT Aug 11, 2025
 
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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