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.

Partly Cloudy

80°F

27°C

Humidity 87%
Wind Speed Calm
Barometer 29.89 in (1011.4 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 19 Jul 7:54 pm CDT
Extended Forecast for

Ballwin MO

Heat Advisory July 19, 08:48pm until July 21, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory July 19, 08:48pm until July 21, 07:00pm

    NOW until 7:00pm Tue

    Heat Advisory

  • Tonight

    Low: 73 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Monday

    Monday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 93. Heat index values as high as 103. Calm wind.

    High: 93 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 77. Calm wind becoming southwest around 5 mph after midnight.

    Low: 77 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96. Heat index values as high as 107. Southwest wind 5 to 8 mph becoming northwest in the afternoon.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 71. North wind 5 to 8 mph.

    Low: 71 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 10pm. Partly cloudy, with a low around 73. Calm wind.
Monday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 93. Heat index values as high as 103. Calm wind.
Monday Night
Mostly clear, with a low around 77. Calm wind becoming southwest around 5 mph after midnight.
Tuesday
Sunny, with a high near 96. Heat index values as high as 107. Southwest wind 5 to 8 mph becoming northwest in the afternoon.
Tuesday Night
Mostly clear, with a low around 71. North wind 5 to 8 mph.
Wednesday
Sunny, with a high near 85.
Wednesday Night
Partly cloudy, with a low around 65.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66.
Friday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 88.
Saturday Night
Mostly clear, with a low around 70.
Sunday
Mostly sunny, with a high near 92.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Ballwin MO
 38.58°N 90.55°W (Elev. 584 ft)
Last Update:
6:31 pm CDT Jul 19, 2026
Forecast Valid:
8pm CDT Jul 19, 2026-6pm CDT Jul 26, 2026
 
Forecast Discussion
 
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Additional Resources

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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