Areas of Dangerous Heat and Severe Thunderstorms

Dangerous heat will build across the Southwest U.S. through the end of the week with daytime highs of 110-115°F. Heat across the southern Plains will briefly ease to near-normal by late week before returning over much of the Plains into next week. Severe thunderstorms are expected across parts of the central and southern High Plains, central Great Lakes, and Ozarks Wednesday. Read More >

Current conditions at

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

Lat: 38.66°NLon: 90.66°WElev: 463ft.

Fair

73°F

23°C

Humidity 87%
Wind Speed Calm
Barometer 29.99 in (1014.6 mb)
Dewpoint 69°F (21°C)
Visibility 9.00 mi
Last update 25 Aug 11:54 pm CDT
Extended Forecast for

Ballwin MO

  • Overnight

    Overnight: Mostly cloudy, with a low around 70. Light southeast wind.

    Low: 70 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A slight chance of showers and thunderstorms before 9am, then a slight chance of showers and thunderstorms after 4pm.  Partly sunny, with a high near 89. Calm wind becoming west around 6 mph in the afternoon.  Chance of precipitation is 20%.

    High: 89 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 8pm.  Mostly cloudy, then gradually becoming clear, with a low around 66. West wind around 5 mph becoming calm  in the evening.

    Low: 66 °F

    Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 86. North wind 3 to 6 mph.

    High: 86 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65. North wind around 5 mph becoming calm  in the evening.

    Low: 65 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 86.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 70. Light southeast wind.
Wednesday
A slight chance of showers and thunderstorms before 9am, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 89. Calm wind becoming west around 6 mph in the afternoon. Chance of precipitation is 20%.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Mostly cloudy, then gradually becoming clear, with a low around 66. West wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 86. North wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 65. North wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 86.
Friday Night
Mostly clear, with a low around 62.
Saturday
Sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 67.
Sunday
Mostly sunny, with a high near 93.
Sunday Night
Mostly clear, with a low around 73.
Monday
Mostly sunny, with a high near 94.
Monday Night
A 20 percent chance of showers. Partly cloudy, with a low around 74.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 92.
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ABOUT THIS FORECAST

 
Point Forecast:
Ballwin MO
 38.61°N 90.54°W (Elev. 597 ft)
9:36 pm CDT Aug 25, 2026
12am CDT Aug 26, 2026-6pm CDT Sep 1, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database