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

26°C

78°F

Humidity 86%
Wind Speed SW 15 km/h
Barometer 30.01 in
Dewpoint 23°C (73°F)
Visibility 16 km
Heat Index27°C (80°F)
Last update 12 Jul 8:55 pm CDT
Extended Forecast for

Marion IL

  • Tonight

    Tonight: Patchy fog after 1am. Otherwise, partly cloudy, with a low around 22. Calm wind.

    Low: 22 °C

    Mostly Cloudy
    then Patchy
    Fog

  • Sunday

    Sunday: Showers and thunderstorms likely, mainly after 4pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 32. Calm wind becoming south southwest 5 to 8 km/h in the afternoon. Chance of precipitation is 60%.

    High: 32 °C

    Slight Chance
    T-storms and
    Patchy Fog
    then T-storms
    Likely

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 22. Calm wind. Chance of precipitation is 60%.

    Low: 22 °C

    T-storms
    Likely then
    Chance
    Showers

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 32. Calm wind becoming south southwest 5 to 8 km/h in the afternoon.

    High: 32 °C

    Partly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 23. Calm wind. Chance of precipitation is 20%.

    Low: 23 °C

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 32. Light south wind becoming south southwest 6 to 11 km/h in the morning. Chance of precipitation is 50%.

    High: 32 °C

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 23. South southwest wind 3 to 8 km/h.

    Low: 23 °C

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers and thunderstorms. Mostly sunny, with a high near 33. Southwest wind 5 to 13 km/h.

    High: 33 °C

    Chance
    Showers then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 24. South southwest wind 5 to 10 km/h becoming calm.

    Low: 24 °C

    Chance
    T-storms

Detailed Forecast

Tonight
Patchy fog after 1am. Otherwise, partly cloudy, with a low around 22. Calm wind.
Sunday
Showers and thunderstorms likely, mainly after 4pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 32. Calm wind becoming south southwest 5 to 8 km/h in the afternoon. Chance of precipitation is 60%.
Sunday Night
Showers and thunderstorms likely before 10pm, then a chance of showers between 10pm and 1am. Mostly cloudy, with a low around 22. Calm wind. Chance of precipitation is 60%.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 32. Calm wind becoming south southwest 5 to 8 km/h in the afternoon.
Monday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 23. Calm wind. Chance of precipitation is 20%.
Tuesday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 32. Light south wind becoming south southwest 6 to 11 km/h in the morning. Chance of precipitation is 50%.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 23. South southwest wind 3 to 8 km/h.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 33. Southwest wind 5 to 13 km/h.
Wednesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 24. South southwest wind 5 to 10 km/h becoming calm.
Thursday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 33. Southwest wind 8 to 11 km/h.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 23. South southwest wind 5 to 10 km/h becoming calm after midnight.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 32. West southwest wind 5 to 10 km/h.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 22. West wind 5 to 8 km/h becoming calm in the evening.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 32. Calm wind becoming west southwest 5 to 10 km/h in the morning.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marion IL
 37.73°N 88.92°W
Last Update:
6:32 pm CDT Jul 12, 2025
Forecast Valid:
9pm CDT Jul 12, 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