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

74°F

23°C

Humidity 91%
Wind Speed Calm
Barometer 30.07 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 28 Jun 6:35 am CDT
Extended Forecast for

Johnston City IL

  • Today

    Today: Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 88. Calm wind becoming south southwest around 6 mph in the morning. Chance of precipitation is 60%.

    High: 88 °F

    T-storms
    Likely

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. South wind around 5 mph becoming calm in the evening.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Showers and thunderstorms. High near 87. Calm wind becoming southwest around 6 mph in the morning. Chance of precipitation is 80%.

    High: 87 °F

    T-storms

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southwest wind 3 to 6 mph.

    Low: 73 °F

    Chance
    T-storms

  • Monday

    Monday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 87. West southwest wind 5 to 7 mph. Chance of precipitation is 80%.

    High: 87 °F

    Chance
    Showers then
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 70. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 50%.

    Low: 70 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 87. Calm wind becoming north around 5 mph in the afternoon.

    High: 87 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 67. Calm wind.

    Low: 67 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 89. Light west wind.

    High: 89 °F

    Sunny

Detailed Forecast

Today
Showers and thunderstorms likely, mainly after 1pm. Partly sunny, with a high near 88. Calm wind becoming south southwest around 6 mph in the morning. Chance of precipitation is 60%.
Tonight
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 72. South wind around 5 mph becoming calm in the evening.
Sunday
Showers and thunderstorms. High near 87. Calm wind becoming southwest around 6 mph in the morning. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southwest wind 3 to 6 mph.
Monday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 87. West southwest wind 5 to 7 mph. Chance of precipitation is 80%.
Monday Night
A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 70. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 50%.
Tuesday
Mostly sunny, with a high near 87. Calm wind becoming north around 5 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 67. Calm wind.
Wednesday
Sunny, with a high near 89. Light west wind.
Wednesday Night
A slight chance of showers. Mostly clear, with a low around 69. Calm wind.
Thursday
A slight chance of showers and thunderstorms. Sunny, with a high near 90. Calm wind becoming southwest around 5 mph in the afternoon.
Thursday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 71. Light south southwest wind.
Independence Day
A slight chance of showers and thunderstorms. Sunny, with a high near 91. Calm wind becoming south southwest around 6 mph in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Johnston City IL
 37.85°N 88.94°W
Last Update:
4:30 am CDT Jun 28, 2025
Forecast Valid:
6am CDT Jun 28, 2025-6pm CDT Jul 4, 2025
 
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Additional Resources

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Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation