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

30°F

-1°C

Humidity 41%
Wind Speed NW 7 mph
Barometer 30.50 in (1033.2 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill23°F (-5°C)
Last update 23 Feb 2:53 pm CST
Extended Forecast for

Affton MO

  • Tonight

    Tonight: Mostly clear, with a low around 22. Calm wind becoming south around 6 mph after midnight.

    Low: 22 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 56. Southwest wind 7 to 15 mph, with gusts as high as 36 mph.

    High: 56 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37. Southwest wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 20 mph.

    Low: 37 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 54. Calm wind becoming north around 5 mph in the afternoon.

    High: 54 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain. Mostly cloudy, with a low around 38. East wind around 6 mph.

    Low: 38 °F

    Chance Rain

  • Thursday

    Thursday: A 30 percent chance of rain before noon. Partly sunny, with a high near 50.

    High: 50 °F

    Chance Rain
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 34.

    Low: 34 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Friday Night

    Friday Night: Clear, with a low around 42.

    Low: 42 °F

    Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 22. Calm wind becoming south around 6 mph after midnight.
Tuesday
Increasing clouds, with a high near 56. Southwest wind 7 to 15 mph, with gusts as high as 36 mph.
Tuesday Night
Mostly cloudy, with a low around 37. Southwest wind 5 to 9 mph becoming calm after midnight. Winds could gust as high as 20 mph.
Wednesday
Mostly sunny, with a high near 54. Calm wind becoming north around 5 mph in the afternoon.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 38. East wind around 6 mph.
Thursday
A 30 percent chance of rain before noon. Partly sunny, with a high near 50.
Thursday Night
Mostly clear, with a low around 34.
Friday
Sunny, with a high near 65.
Friday Night
Clear, with a low around 42.
Saturday
Sunny, with a high near 68.
Saturday Night
Mostly cloudy, with a low around 34.
Sunday
A 30 percent chance of rain. Partly sunny, with a high near 49.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 33.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 47.
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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:
2:51 pm CST Feb 23, 2026
Forecast Valid:
3pm CST Feb 23, 2026-6pm CST Mar 2, 2026
 
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