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

57°F

14°C

Humidity 59%
Wind Speed SE 10 mph
Barometer 29.98 in
Dewpoint 43°F (6°C)
Visibility 10.00 mi
Last update 15 May 6:45 am CDT
Extended Forecast for

3 Miles ENE Johnston City IL

  • Today

    Today: A slight chance of showers and thunderstorms between 9am and 10am. Partly sunny, with a high near 82. South southeast wind 8 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

    High: 82 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. South wind 10 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

    Low: 68 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 86. South southwest wind around 14 mph, with gusts as high as 22 mph.

    High: 86 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 67. South wind 9 to 11 mph, with gusts as high as 20 mph.

    Low: 67 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 89. South wind 9 to 16 mph, with gusts as high as 24 mph.

    High: 89 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 70. South wind 11 to 13 mph, with gusts as high as 21 mph.

    Low: 70 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Breezy, with a south wind 13 to 20 mph, with gusts as high as 26 mph.

    High: 90 °F

    Mostly Sunny
    then Chance
    T-storms and
    Breezy

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind 14 to 16 mph, with gusts as high as 24 mph.

    Low: 73 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 87. South southwest wind 14 to 17 mph, with gusts as high as 25 mph.

    High: 87 °F

    Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Today
A slight chance of showers and thunderstorms between 9am and 10am. Partly sunny, with a high near 82. South southeast wind 8 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
Tonight
A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68. South wind 10 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Saturday
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 86. South southwest wind around 14 mph, with gusts as high as 22 mph.
Saturday Night
Partly cloudy, with a low around 67. South wind 9 to 11 mph, with gusts as high as 20 mph.
Sunday
Sunny, with a high near 89. South wind 9 to 16 mph, with gusts as high as 24 mph.
Sunday Night
Mostly clear, with a low around 70. South wind 11 to 13 mph, with gusts as high as 21 mph.
Monday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Breezy, with a south wind 13 to 20 mph, with gusts as high as 26 mph.
Monday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. South wind 14 to 16 mph, with gusts as high as 24 mph.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 87. South southwest wind 14 to 17 mph, with gusts as high as 25 mph.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. South southwest wind 6 to 13 mph, with gusts as high as 20 mph.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 79. North northwest wind around 9 mph.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 59. North northeast wind 5 to 8 mph.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 78. Northeast wind 7 to 9 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ENE Johnston City IL
 37.82°N 88.86°W
Last Update:
3:32 am CDT May 15, 2026
Forecast Valid:
7am CDT May 15, 2026-6pm CDT May 21, 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