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

Severe Thunderstorms and Excessive Rainfall in the Central U.S.; Heat Building in the Western U.S.

A cold front pressing east across the central U.S. will be the focus for areas of strong to severe thunderstorms and excessive rainfall through this weekend. Strong to severe thunderstorms my bring damaging winds, hail, and a few tornadoes while excessive rainfall may lead to areas of flooding. Heat will build across the western U.S. with heat-related watches, warnings, and advisories issued. Read More >

Hazardous Weather Conditions

Current conditions at

Marion - Williamson County Regional Airport (KMWA)

Lat: 37.77°NLon: 89.01°WElev: 486ft.

Partly Cloudy

81°F

27°C

Humidity 79%
Wind Speed Calm
Barometer 30.05 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 13 Jul 9:45 am CDT
Extended Forecast for

Marion IL

  • Today

    Today: Showers and thunderstorms, mainly after 1pm. High near 86. South southwest wind 5 to 9 mph. Chance of precipitation is 80%.

    High: 86 °F

    Chance
    T-storms then
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms, mainly before 7pm. Patchy fog after midnight. Low around 71. Calm wind. Chance of precipitation is 80%.

    Low: 71 °F

    T-storms then
    Chance
    T-storms and
    Patchy Fog

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Areas of fog before 8am. Otherwise, partly sunny, with a high near 88. Light west wind. Chance of precipitation is 50%.

    High: 88 °F

    Slight Chance
    T-storms and
    Areas Fog
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Calm wind.

    Low: 73 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 90. Calm wind becoming south southwest 5 to 7 mph in the morning.

    High: 90 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73. Light south wind.

    Low: 73 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92. Southwest wind 3 to 7 mph.

    High: 92 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 74. Southwest wind 3 to 6 mph.

    Low: 74 °F

    Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91. Southwest wind 3 to 7 mph.

    High: 91 °F

    Chance
    T-storms

Detailed Forecast

Today
Showers and thunderstorms, mainly after 1pm. High near 86. South southwest wind 5 to 9 mph. Chance of precipitation is 80%.
Tonight
Showers and thunderstorms, mainly before 7pm. Patchy fog after midnight. Low around 71. Calm wind. Chance of precipitation is 80%.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Areas of fog before 8am. Otherwise, partly sunny, with a high near 88. Light west wind. Chance of precipitation is 50%.
Monday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Calm wind.
Tuesday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 90. Calm wind becoming south southwest 5 to 7 mph in the morning.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73. Light south wind.
Wednesday
A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92. Southwest wind 3 to 7 mph.
Wednesday Night
A chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 74. Southwest wind 3 to 6 mph.
Thursday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91. Southwest wind 3 to 7 mph.
Thursday Night
A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 73. West wind around 5 mph becoming calm in the evening.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 89. Light and variable wind becoming south around 6 mph in the morning.
Friday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 72. Light and variable wind.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 90. Calm wind becoming southwest around 5 mph in the afternoon.
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.71°N 88.95°W
Last Update:
9:46 am CDT Jul 13, 2025
Forecast Valid:
9am CDT Jul 13, 2025-6pm CDT Jul 19, 2025
 
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