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

Areas of Heavy Rainfall and Heat Early This Week

Excessive rainfall may produce locally considerable flash flooding over parts of South Texas, the western Gulf Coast, and lower Mississippi River Valley today into Thursday. Rainfall totals of 5 to 10 inches are expected. Hot temperatures may cause heat illnesses over central and northern California and the Pacific Northwest through Tuesday. Read More >

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

65°F

18°C

Humidity 65%
Wind Speed Calm
Barometer 29.96 in
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Last update 15 Jun 8:55 pm CDT
Extended Forecast for

Carterville IL

  • Tonight

    Tonight: Mostly clear, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 3pm. Increasing clouds, with a high near 83. Calm wind becoming southwest 5 to 9 mph in the morning.

    High: 83 °F

    Sunny then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 11pm. Mostly clear, with a low around 62. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.

    Low: 62 °F

    Chance
    T-storms then
    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 88. Breezy, with a light south wind becoming south southwest 16 to 21 mph in the morning. Winds could gust as high as 36 mph.

    High: 88 °F

    Sunny then
    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Partly cloudy, with a low around 73. Breezy, with a south southwest wind 13 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 60%.

    Low: 73 °F

    Chance
    Showers and
    Breezy then
    Showers
    Likely

  • Thursday

    Thursday: Showers likely, with thunderstorms also possible after 7am. Partly sunny, with a high near 83. Southwest wind 6 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 62. North northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 62 °F

    Showers
    Likely

  • Juneteenth

    Juneteenth: Mostly sunny, with a high near 82. Calm wind becoming north around 6 mph in the morning.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62. Calm wind.

    Low: 62 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 59. Calm wind.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Increasing clouds, with a high near 83. Calm wind becoming southwest 5 to 9 mph in the morning.
Tuesday Night
A chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 11pm. Mostly clear, with a low around 62. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Wednesday
Sunny, with a high near 88. Breezy, with a light south wind becoming south southwest 16 to 21 mph in the morning. Winds could gust as high as 36 mph.
Wednesday Night
A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then showers likely after 4am. Partly cloudy, with a low around 73. Breezy, with a south southwest wind 13 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 60%.
Thursday
Showers likely, with thunderstorms also possible after 7am. Partly sunny, with a high near 83. Southwest wind 6 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 60%.
Thursday Night
Showers likely, mainly before 1am. Mostly cloudy, with a low around 62. North northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Juneteenth
Mostly sunny, with a high near 82. Calm wind becoming north around 6 mph in the morning.
Friday Night
Mostly clear, with a low around 62. Calm wind.
Saturday
Sunny, with a high near 86. Calm wind becoming south around 5 mph in the afternoon.
Saturday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 66. South wind around 5 mph becoming calm in the evening.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. South southwest wind 5 to 11 mph, with gusts as high as 21 mph.
Sunday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 70. South wind 7 to 10 mph, with gusts as high as 18 mph.
Monday
Showers and thunderstorms likely. Mostly cloudy, with a high near 87. South wind 7 to 9 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
Carterville IL
 37.74°N 89.09°W
Last Update:
6:01 pm CDT Jun 15, 2026
Forecast Valid:
9pm CDT Jun 15, 2026-6pm CDT Jun 22, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation