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.

Fair

57°F

14°C

Humidity 96%
Wind Speed Calm
Barometer 29.96 in (1014.3 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 3 Sep 1:53 am CDT
Extended Forecast for

Affton MO

  • Overnight

    Overnight: Clear, with a low around 60. Calm wind.

    Low: 60 °F

    Clear

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 86. Calm wind becoming west 5 to 9 mph in the afternoon.

    High: 86 °F

    Sunny then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: Showers and thunderstorms likely. Mostly cloudy, with a low around 58. West wind around 7 mph. Chance of precipitation is 60%.

    Low: 58 °F

    Showers
    Likely

  • Thursday

    Thursday: A 30 percent chance of showers before 7am. Mostly cloudy through mid morning, then gradual clearing, with a high near 77. North wind around 6 mph.

    High: 77 °F

    Chance
    Showers then
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62. Calm wind becoming southwest around 6 mph after midnight.

    Low: 62 °F

    Mostly Clear

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers, mainly before 1am. Partly cloudy, with a low around 54.

    Low: 54 °F

    Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 78.

    High: 78 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 54.

    Low: 54 °F

    Mostly Clear

Detailed Forecast

Overnight
Clear, with a low around 60. Calm wind.
Wednesday
A 30 percent chance of showers and thunderstorms after 4pm. Sunny, with a high near 86. Calm wind becoming west 5 to 9 mph in the afternoon.
Wednesday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 58. West wind around 7 mph. Chance of precipitation is 60%.
Thursday
A 30 percent chance of showers before 7am. Mostly cloudy through mid morning, then gradual clearing, with a high near 77. North wind around 6 mph.
Thursday Night
Mostly clear, with a low around 62. Calm wind becoming southwest around 6 mph after midnight.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 78.
Friday Night
A 30 percent chance of showers, mainly before 1am. Partly cloudy, with a low around 54.
Saturday
Sunny, with a high near 78.
Saturday Night
Mostly clear, with a low around 54.
Sunday
Mostly sunny, with a high near 79.
Sunday Night
Partly cloudy, with a low around 58.
Monday
Partly sunny, with a high near 78.
Monday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 59.
Tuesday
A 20 percent chance of showers. Partly 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:
2:21 am CDT Sep 3, 2025
Forecast Valid:
2am CDT Sep 3, 2025-6pm CDT Sep 9, 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