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

Lala Approaching Hawaii; Flash Flooding Risks; Excessive Heat

Lala, may become a hurricane, is expected to impact Hawaii this weekend. Heavy rainfall, strong winds, dangerous surf and localized flooding are expected. Heavy rainfall and flash flooding concerns from the mid-Mississippi Valley, Ohio Valley into the central Appalachians continues, with the threat shifting toward the mid-Atlantic later this weekend. Record heat continues for areas of the South. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

84°F

29°C

Humidity 72%
Wind Speed SE 8 mph
Barometer 30.10 in (1018.8 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index91°F (33°C)
Last update 15 Aug 11:53 am CDT
Extended Forecast for

Sappington MO

Extreme Heat Warning August 15, 12:18pm until August 16, 09:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 15, 12:18pm until August 16, 09:00pm

    NOW until 9:00pm Sun

    Extreme Heat Warning

  • This Afternoon

    High: 95 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 76. Calm wind becoming southwest around 5 mph after midnight.

    Low: 76 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 95. Heat index values as high as 107. Southwest wind 5 to 7 mph becoming northwest in the afternoon.

    High: 95 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of showers and thunderstorms, mainly between 2am and 4am. Increasing clouds, with a low around 72. North wind 5 to 7 mph.

    Low: 72 °F

    Chance
    T-storms

  • Monday

    Monday: Mostly sunny, with a high near 86. North wind around 6 mph.

    High: 86 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 69.

    Low: 69 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.

    Low: 74 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 95. Heat index values as high as 107. Southwest wind around 6 mph.
Tonight
Partly cloudy, with a low around 76. Calm wind becoming southwest around 5 mph after midnight.
Sunday
Mostly sunny, with a high near 95. Heat index values as high as 107. Southwest wind 5 to 7 mph becoming northwest in the afternoon.
Sunday Night
A 30 percent chance of showers and thunderstorms, mainly between 2am and 4am. Increasing clouds, with a low around 72. North wind 5 to 7 mph.
Monday
Mostly sunny, with a high near 86. North wind around 6 mph.
Monday Night
Partly cloudy, with a low around 69.
Tuesday
Sunny, with a high near 90.
Tuesday Night
A 20 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 74.
Wednesday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 91. Chance of precipitation is 20%.
Wednesday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 69.
Thursday
A 20 percent chance of showers. Partly sunny, with a high near 82.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 65.
Friday
Mostly sunny, with a high near 82.
Basemap Options
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Sappington MO
 38.53°N 90.38°W (Elev. 604 ft)
Last Update:
12:06 pm CDT Aug 15, 2026
Forecast Valid:
12pm CDT Aug 15, 2026-6pm CDT Aug 21, 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