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

Hazardous Weather Conditions

Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

A Few Clouds

94°F

34°C

Humidity 51%
Wind Speed SW 5 mph
Barometer 30.08 in (1016.9 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index104°F (40°C)
Last update 16 Aug 11:51 am CDT
Extended Forecast for

Wellston MO

Heat Advisory August 16, 11:58am until August 18, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 16, 11:58am until August 18, 08:00pm

    NOW until 8:00pm Mon

    Heat Advisory

  • Today

    High: 98 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 79. Southeast wind 3 to 5 mph.

    Low: 79 °F

    Partly Cloudy

  • Sunday

    Sunday: Scattered showers and thunderstorms, mainly after 5pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 105. Calm wind becoming east around 6 mph in the afternoon. Chance of precipitation is 30%.

    High: 99 °F

    Sunny then
    Scattered
    T-storms

  • Sunday Night

    Sunday Night: Scattered showers and thunderstorms before 7pm. Mostly clear, with a low around 78. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.

    Low: 78 °F

    Scattered
    T-storms then
    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 100. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 100 °F

    Hot

  • Monday Night

    Monday Night: Mostly clear, with a low around 78.

    Low: 78 °F

    Mostly Clear

  • Tuesday

    Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 98.

    High: 98 °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 74. Chance of precipitation is 40%.

    Low: 74 °F

    Chance
    T-storms

Detailed Forecast

Today
Isolated showers and thunderstorms after 4pm. Mostly sunny and hot, with a high near 98. Heat index values as high as 105. Southwest wind around 6 mph. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 79. Southeast wind 3 to 5 mph.
Sunday
Scattered showers and thunderstorms, mainly after 5pm. Mostly sunny and hot, with a high near 99. Heat index values as high as 105. Calm wind becoming east around 6 mph in the afternoon. Chance of precipitation is 30%.
Sunday Night
Scattered showers and thunderstorms before 7pm. Mostly clear, with a low around 78. Southeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Monday
Sunny and hot, with a high near 100. Calm wind becoming southwest around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 78.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 98.
Tuesday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 74. Chance of precipitation is 40%.
Wednesday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Wednesday Night
Partly cloudy, with a low around 69.
Thursday
Mostly sunny, with a high near 86.
Thursday Night
Mostly clear, with a low around 67.
Friday
Sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Wellston MO
 38.64°N 90.29°W (Elev. 489 ft)
Last Update:
10:36 am CDT Aug 16, 2025
Forecast Valid:
11am CDT Aug 16, 2025-6pm CDT Aug 22, 2025
 
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