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

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fog/Mist

74°F

23°C

Humidity 97%
Wind Speed S 6 mph
Barometer 29.98 in (1015.1 mb)
Dewpoint 73°F (23°C)
Visibility 2.00 mi
Last update 15 Oct 11:53 am CDT
Extended Forecast for

Affton MO

  • This Afternoon

    This Afternoon: Showers and possibly a thunderstorm, mainly before 5pm, then a chance of showers and thunderstorms after 5pm. High near 81. Southwest wind 7 to 9 mph. Chance of precipitation is 80%.

    High: 81 °F

    Showers

  • Tonight

    Tonight: Showers and thunderstorms likely before midnight, then a slight chance of showers between midnight and 4am. Increasing clouds, with a low around 49. Northwest wind 8 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 70%.

    Low: 49 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday

    Friday: A 20 percent chance of showers after 4pm. Partly sunny, with a high near 56. Northwest wind 15 to 17 mph, with gusts as high as 28 mph.

    High: 56 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Friday Night

    Friday Night: Cloudy, then gradually becoming partly cloudy, with a low around 40. North wind 7 to 14 mph, with gusts as high as 23 mph.

    Low: 40 °F

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 59. North wind around 5 mph becoming calm in the morning.

    High: 59 °F

    Sunny

  • Saturday Night

    Saturday Night: Clear, with a low around 39.

    Low: 39 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 71.

    High: 71 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm, mainly before 5pm, then a chance of showers and thunderstorms after 5pm. High near 81. Southwest wind 7 to 9 mph. Chance of precipitation is 80%.
Tonight
Showers and thunderstorms likely before midnight, then a slight chance of showers between midnight and 4am. Increasing clouds, with a low around 49. Northwest wind 8 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 70%.
Friday
A 20 percent chance of showers after 4pm. Partly sunny, with a high near 56. Northwest wind 15 to 17 mph, with gusts as high as 28 mph.
Friday Night
Cloudy, then gradually becoming partly cloudy, with a low around 40. North wind 7 to 14 mph, with gusts as high as 23 mph.
Saturday
Sunny, with a high near 59. North wind around 5 mph becoming calm in the morning.
Saturday Night
Clear, with a low around 39.
Sunday
Sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 42.
Monday
Mostly sunny, with a high near 71.
Monday Night
Partly cloudy, with a low around 45.
Tuesday
Sunny, with a high near 74.
Tuesday Night
Mostly clear, with a low around 48.
Wednesday
Sunny, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Affton MO
 38.56°N 90.32°W (Elev. 564 ft)
Last Update:
11:21 am CDT Oct 15, 2026
Forecast Valid:
12pm CDT Oct 15, 2026-6pm CDT Oct 21, 2026
 
Forecast Discussion
 
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Additional Resources

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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