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

45°F

7°C

Humidity 53%
Wind Speed S 13 mph
Barometer 30.09 in
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 12 Mar 9:35 pm CDT
Extended Forecast for

3 Miles ENE Johnston City IL

  • Tonight

    Tonight: Partly cloudy, with a low around 43. Breezy, with a south wind 9 to 14 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 37 mph.

    Low: 43 °F

    Partly Cloudy
    then Partly
    Cloudy and
    Breezy

  • Friday

    Friday: Mostly sunny, with a high near 63. Southwest wind 13 to 18 mph, with gusts as high as 36 mph.

    High: 63 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 37. West northwest wind around 6 mph becoming calm in the evening.

    Low: 37 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 67. East wind 6 to 10 mph becoming south southeast in the afternoon.

    High: 67 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 54. Southeast wind 7 to 13 mph, with gusts as high as 22 mph.

    Low: 54 °F

    Partly Cloudy

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 72. Breezy, with a south wind 16 to 25 mph, with gusts as high as 37 mph. Chance of precipitation is 70%.

    High: 72 °F

    Breezy.
    Mostly Cloudy
    then Showers
    Likely

  • Sunday Night

    Sunday Night: Rain showers before 1am, then a chance of rain and snow showers. Some thunder is also possible. Low around 26. Blustery, with a south southwest wind around 25 mph becoming west northwest after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 80%.

    Low: 26 °F

    Showers and
    Breezy then
    Rain/Snow and
    Blustery

  • Monday

    Monday: Mostly cloudy, with a high near 34. Breezy, with a west northwest wind 22 to 24 mph, with gusts as high as 33 mph.

    High: 34 °F

    Mostly Cloudy
    and Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 15. Northwest wind 8 to 17 mph, with gusts as high as 23 mph.

    Low: 15 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 43. Breezy, with a south wind 9 to 14 mph increasing to 16 to 21 mph after midnight. Winds could gust as high as 37 mph.
Friday
Mostly sunny, with a high near 63. Southwest wind 13 to 18 mph, with gusts as high as 36 mph.
Friday Night
Partly cloudy, with a low around 37. West northwest wind around 6 mph becoming calm in the evening.
Saturday
Mostly sunny, with a high near 67. East wind 6 to 10 mph becoming south southeast in the afternoon.
Saturday Night
Partly cloudy, with a low around 54. Southeast wind 7 to 13 mph, with gusts as high as 22 mph.
Sunday
Showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 72. Breezy, with a south wind 16 to 25 mph, with gusts as high as 37 mph. Chance of precipitation is 70%.
Sunday Night
Rain showers before 1am, then a chance of rain and snow showers. Some thunder is also possible. Low around 26. Blustery, with a south southwest wind around 25 mph becoming west northwest after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 80%.
Monday
Mostly cloudy, with a high near 34. Breezy, with a west northwest wind 22 to 24 mph, with gusts as high as 33 mph.
Monday Night
Mostly clear, with a low around 15. Northwest wind 8 to 17 mph, with gusts as high as 23 mph.
Tuesday
Mostly sunny, with a high near 37. West wind 7 to 9 mph.
Tuesday Night
A slight chance of rain and snow showers. Mostly cloudy, with a low around 27. South southwest wind 6 to 9 mph becoming southeast in the evening.
Wednesday
Partly sunny, with a high near 55. South southwest wind 10 to 13 mph, with gusts as high as 20 mph.
Wednesday Night
Partly cloudy, with a low around 39. South southwest wind around 7 mph.
Thursday
Mostly sunny, with a high near 66. South southwest wind 6 to 10 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:
9:36 pm CDT Mar 12, 2026
Forecast Valid:
9pm CDT Mar 12, 2026-6pm CDT Mar 19, 2026
 
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Additional Resources

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Hourly Weather Forecast

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National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation