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.

A Few Clouds

94°F

34°C

Humidity 54%
Wind Speed SW 8 mph
Barometer 30.04 in (1016.2 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index106°F (41°C)
Last update 16 Aug 12:54 pm CDT
Extended Forecast for

3 Miles ESE Weldon Spring MO

Heat Advisory August 16, 01:52pm until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 16, 01:52pm until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • This Afternoon

    High: 97 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Isolated showers and thunderstorms before 8pm. Partly cloudy, with a low around 75. Southeast wind 3 to 5 mph. Chance of precipitation is 20%.

    Low: 75 °F

    Isolated
    T-storms then
    Mostly Clear

  • Sunday

    Sunday: Scattered showers and thunderstorms, mainly after 5pm. Mostly sunny and hot, with a high near 98. Heat index values as high as 107. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 30%.

    High: 98 °F

    Sunny then
    Scattered
    T-storms

  • Sunday Night

    Sunday Night: Scattered showers and thunderstorms before 7pm. Mostly clear, with a low around 76. Light southeast wind. Chance of precipitation is 30%.

    Low: 76 °F

    Scattered
    T-storms then
    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 99. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 99 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96.

    High: 96 °F

    Sunny then
    Slight Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 73. Chance of precipitation is 40%.

    Low: 73 °F

    Chance
    T-storms

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms after 4pm. Sunny and hot, with a high near 97. Heat index values as high as 107. South wind around 6 mph. Chance of precipitation is 20%.
Tonight
Isolated showers and thunderstorms before 8pm. Partly cloudy, with a low around 75. Southeast wind 3 to 5 mph. Chance of precipitation is 20%.
Sunday
Scattered showers and thunderstorms, mainly after 5pm. Mostly sunny and hot, with a high near 98. Heat index values as high as 107. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 30%.
Sunday Night
Scattered showers and thunderstorms before 7pm. Mostly clear, with a low around 76. Light southeast wind. Chance of precipitation is 30%.
Monday
Sunny and hot, with a high near 99. Calm wind becoming southwest around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 76.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96.
Tuesday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 73. Chance of precipitation is 40%.
Wednesday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Mostly sunny, with a high near 84.
Thursday Night
Mostly clear, with a low around 66.
Friday
Sunny, with a high near 87.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
3 Miles ESE Weldon Spring MO
 38.7°N 90.6°W (Elev. 446 ft)
Last Update:
12:26 pm CDT Aug 16, 2025
Forecast Valid:
1pm CDT Aug 16, 2025-6pm CDT Aug 22, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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