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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

76°F

24°C

Humidity 72%
Wind Speed SW 7 mph
Barometer 29.99 in (1015.2 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 21 Sep 10:53 am CDT
Extended Forecast for

Affton MO

  • Today

    Today: Scattered showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 86. Southwest wind 3 to 7 mph. Chance of precipitation is 30%.

    High: 86 °F

    Scattered
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 66. Southwest wind 5 to 7 mph becoming light and variable. Chance of precipitation is 80%.

    Low: 66 °F

    T-storms

  • Monday

    Monday: Showers and possibly a thunderstorm before 10am, then scattered showers and thunderstorms, mainly between 10am and 4pm. High near 78. Southwest wind around 7 mph. Chance of precipitation is 80%.

    High: 78 °F

    Showers then
    Scattered
    Showers

  • Monday Night

    Monday Night: Scattered showers and thunderstorms before 7pm, then showers likely and possibly a thunderstorm between 7pm and 1am, then a chance of showers after 1am. Mostly cloudy, with a low around 66. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

  • Tuesday

    Tuesday: A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 50%.

    High: 79 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. Chance of precipitation is 60%.

    High: 77 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Chance
    Showers

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers

Detailed Forecast

Today
Scattered showers and thunderstorms, mainly after 4pm. Partly sunny, with a high near 86. Southwest wind 3 to 7 mph. Chance of precipitation is 30%.
Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 66. Southwest wind 5 to 7 mph becoming light and variable. Chance of precipitation is 80%.
Monday
Showers and possibly a thunderstorm before 10am, then scattered showers and thunderstorms, mainly between 10am and 4pm. High near 78. Southwest wind around 7 mph. Chance of precipitation is 80%.
Monday Night
Scattered showers and thunderstorms before 7pm, then showers likely and possibly a thunderstorm between 7pm and 1am, then a chance of showers after 1am. Mostly cloudy, with a low around 66. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Tuesday
A chance of showers, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 79. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 50%.
Tuesday Night
A chance of showers and thunderstorms, then showers likely after 1am. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Wednesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. Chance of precipitation is 60%.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 76. Chance of precipitation is 40%.
Thursday Night
A 30 percent chance of showers, mainly before 1am. Partly cloudy, with a low around 60.
Friday
A 20 percent chance of showers. Mostly sunny, with a high near 77.
Friday Night
Partly cloudy, with a low around 60.
Saturday
Sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
Affton MO
 38.56°N 90.32°W (Elev. 564 ft)
Last Update:
10:56 am CDT Sep 21, 2025
Forecast Valid:
11am CDT Sep 21, 2025-6pm CDT Sep 27, 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