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

Thunderstorms and Heavy Rainfall in the Mid-Atlantic; Fire Weather Concerns in the West

Thunderstorms are expected to bring heavy rain and potential significant flash and urban flooding to the Mid-Atlantic on Thursday, especially along the I-95 urban corridor. Dry conditions, gusty winds, and isolated dry thunderstorms will continue to bring a critical fire weather threat to the northwestern Great Basin into the interior Northwest through Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fair

80°F

27°C

Humidity 87%
Wind Speed Calm
Barometer 30.01 in
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 30 Jul 8:55 pm CDT
Extended Forecast for

Carterville IL

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. Light and variable wind.

    Low: 74 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly cloudy, with a high near 86. Light north wind increasing to 5 to 10 mph in the morning.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 67. North northeast wind around 8 mph.

    Low: 67 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 81. North northeast wind 8 to 11 mph, with gusts as high as 18 mph.

    High: 81 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 62. North northeast wind 6 to 9 mph.

    Low: 62 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 81. Northeast wind 6 to 9 mph.

    High: 81 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 62. Northeast wind 3 to 6 mph.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 84. East northeast wind 3 to 6 mph.

    High: 84 °F

    Sunny

  • Sunday Night

    Sunday Night: A slight chance of showers after 1am. Partly cloudy, with a low around 66. East northeast wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear
    then Slight
    Chance
    Showers

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74. Light and variable wind.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Mostly cloudy, with a high near 86. Light north wind increasing to 5 to 10 mph in the morning.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 67. North northeast wind around 8 mph.
Friday
Mostly sunny, with a high near 81. North northeast wind 8 to 11 mph, with gusts as high as 18 mph.
Friday Night
Partly cloudy, with a low around 62. North northeast wind 6 to 9 mph.
Saturday
Mostly sunny, with a high near 81. Northeast wind 6 to 9 mph.
Saturday Night
Mostly clear, with a low around 62. Northeast wind 3 to 6 mph.
Sunday
Sunny, with a high near 84. East northeast wind 3 to 6 mph.
Sunday Night
A slight chance of showers after 1am. Partly cloudy, with a low around 66. East northeast wind around 5 mph becoming calm in the evening.
Monday
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 84. Calm wind becoming south southeast around 5 mph in the afternoon.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 68. East southeast wind around 5 mph becoming calm in the evening.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 85. Calm wind becoming south southeast around 5 mph in the afternoon.
Tuesday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 69. Light and variable wind.
Wednesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Calm wind becoming south southwest around 6 mph in the afternoon.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Carterville IL
 37.76°N 89.09°W
Last Update:
8:00 pm CDT Jul 30, 2025
Forecast Valid:
9pm CDT Jul 30, 2025-6pm CDT Aug 6, 2025
 
Forecast Discussion
 
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Additional Resources

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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