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

Hazardous Weather Conditions

Current conditions at

St. Louis, Spirit Of St. Louis Airport (KSUS)

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

30°C

86°F

Humidity 67%
Wind Speed S 13 km/h
Barometer 1011.6 mb (29.90 in)
Dewpoint 23°C (74°F)
Visibility 16 km
Heat Index34°C (94°F)
Last update 9 Aug 8:54 pm CDT
Extended Forecast for

Ballwin MO

Extreme Heat Warning August 9, 09:42pm until August 12, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 9, 09:42pm until August 12, 08:00pm

    NOW until 8:00pm Wed

    Extreme Heat Warning

  • Tonight

    Low: 25 °C

    Mostly Clear

  • Monday

    Monday: Mostly sunny and hot, with a high near 36. Heat index values as high as 43. Southwest wind 8 to 16 km/h, with gusts as high as 32 km/h.

    High: 36 °C

    Hot

  • Monday Night

    Monday Night: Partly cloudy, with a low around 26. Southwest wind around 11 km/h.

    Low: 26 °C

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny and hot, with a high near 36. Heat index values as high as 42. Southwest wind around 11 km/h.

    High: 36 °C

    Hot

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 26. Southwest wind 5 to 10 km/h.

    Low: 26 °C

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 35.

    High: 35 °C

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 24.

    Low: 24 °C

    Chance
    T-storms

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 31. Chance of precipitation is 60%.

    High: 31 °C

    Showers
    Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 25. South wind 8 to 13 km/h.
Monday
Mostly sunny and hot, with a high near 36. Heat index values as high as 43. Southwest wind 8 to 16 km/h, with gusts as high as 32 km/h.
Monday Night
Partly cloudy, with a low around 26. Southwest wind around 11 km/h.
Tuesday
Mostly sunny and hot, with a high near 36. Heat index values as high as 42. Southwest wind around 11 km/h.
Tuesday Night
Partly cloudy, with a low around 26. Southwest wind 5 to 10 km/h.
Wednesday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 35.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 24.
Thursday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 31. Chance of precipitation is 60%.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 22. Chance of precipitation is 60%.
Friday
A 30 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 30.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 22.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 32.
Saturday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 23.
Sunday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 31.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Ballwin MO
 38.58°N 90.55°W (Elev. 584 m)
Last Update:
9:06 pm CDT Aug 9, 2026
Forecast Valid:
9pm CDT Aug 9, 2026-6pm CDT Aug 16, 2026
 
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