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

Heavy Rainfall and Flooding in the Mid-Atlantic; Heat and Wildfire Concerns in the West

Slow moving showers and thunderstorms may result in flash flooding for portions of the mid-Atlantic region through tonight. Meanwhile, excessive heat will continue to build across the West through Tuesday. Heat Advisories and Extreme Heat Warnings are in effect. Fire Weather concerns continue for the West with dry and breezy conditions. Watching the tropics across the Southeast. Read More >

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Fog/Mist

72°F

22°C

Humidity 96%
Wind Speed Calm
Barometer 30.04 in
Dewpoint 71°F (22°C)
Visibility 5.00 mi
Last update 15 Jul 5:35 am CDT
Extended Forecast for

2 Miles NW Johnston City IL

  • Overnight

    Overnight: A 40 percent chance of showers and thunderstorms. Patchy fog. Otherwise, mostly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Chance
    Showers and
    Patchy Fog

  • Tuesday

    Tuesday: Showers and thunderstorms likely, mainly after 4pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 89. Calm wind becoming south southwest around 6 mph in the afternoon. Chance of precipitation is 60%.

    High: 89 °F

    Chance
    Showers and
    Patchy Fog
    then T-storms
    Likely

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely, mainly before 7pm. Partly cloudy, with a low around 73. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 73 °F

    T-storms
    Likely

  • Wednesday

    Wednesday: A slight chance of thunderstorms before 7am, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. South southwest wind 3 to 7 mph. Chance of precipitation is 30%.

    High: 91 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. South southwest wind around 6 mph becoming calm in the evening.

    Low: 74 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 92. West southwest wind 3 to 7 mph. Chance of precipitation is 50%.

    High: 92 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. West wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 89. Calm wind becoming south southwest around 5 mph.

    High: 89 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Light and variable wind.

    Low: 74 °F

    Chance
    T-storms

Detailed Forecast

Overnight
A 40 percent chance of showers and thunderstorms. Patchy fog. Otherwise, mostly cloudy, with a low around 72. Calm wind.
Tuesday
Showers and thunderstorms likely, mainly after 4pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 89. Calm wind becoming south southwest around 6 mph in the afternoon. Chance of precipitation is 60%.
Tuesday Night
Showers and thunderstorms likely, mainly before 7pm. Partly cloudy, with a low around 73. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Wednesday
A slight chance of thunderstorms before 7am, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. South southwest wind 3 to 7 mph. Chance of precipitation is 30%.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74. South southwest wind around 6 mph becoming calm in the evening.
Thursday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 92. West southwest wind 3 to 7 mph. Chance of precipitation is 50%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. West wind around 5 mph becoming calm in the evening.
Friday
A chance of showers and thunderstorms, mainly after 1pm. Mostly cloudy, with a high near 89. Calm wind becoming south southwest around 5 mph.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 74. Light and variable wind.
Saturday
A chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 90. South southwest wind 3 to 7 mph.
Saturday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 76. South wind 3 to 6 mph.
Sunday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. South southwest wind 5 to 8 mph.
Sunday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 75. South wind around 6 mph.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 92. South southwest wind 6 to 8 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NW Johnston City IL
 37.85°N 88.94°W
Last Update:
4:31 am CDT Jul 15, 2025
Forecast Valid:
5am CDT Jul 15, 2025-6pm CDT Jul 21, 2025
 
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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