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

35°F

2°C

Humidity 34%
Wind Speed S 3 mph
Barometer 30.13 in (1020.7 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Last update 15 Dec 5:53 pm CST
Extended Forecast for

Affton MO

  • Tonight

    Tonight: Increasing clouds, with a low around 30. South wind around 6 mph.

    Low: 30 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly sunny, with a high near 48. South wind 6 to 9 mph.

    High: 48 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36. South wind around 6 mph becoming light and variable after midnight.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 53. Calm wind becoming southeast around 6 mph in the afternoon.

    High: 53 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers after midnight. Mostly cloudy, with a temperature falling to near 43 by 9pm, then rising to around 53 during the remainder of the night. South wind 6 to 11 mph, with gusts as high as 22 mph.

    Low: 43 °F⇑

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Thursday

    Thursday: Showers, mainly before noon. Temperature rising to near 56 by 8am, then falling to around 45 during the remainder of the day. Chance of precipitation is 80%.

    High: 56 °F⇓

    Showers then
    Chance
    Showers

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 22.

    Low: 22 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 39.

    High: 39 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 30. South wind around 6 mph.
Tuesday
Mostly sunny, with a high near 48. South wind 6 to 9 mph.
Tuesday Night
Mostly cloudy, with a low around 36. South wind around 6 mph becoming light and variable after midnight.
Wednesday
Sunny, with a high near 53. Calm wind becoming southeast around 6 mph in the afternoon.
Wednesday Night
A 20 percent chance of showers after midnight. Mostly cloudy, with a temperature falling to near 43 by 9pm, then rising to around 53 during the remainder of the night. South wind 6 to 11 mph, with gusts as high as 22 mph.
Thursday
Showers, mainly before noon. Temperature rising to near 56 by 8am, then falling to around 45 during the remainder of the day. Chance of precipitation is 80%.
Thursday Night
Partly cloudy, with a low around 22.
Friday
Sunny, with a high near 39.
Friday Night
Partly cloudy, with a low around 33.
Saturday
Mostly sunny, with a high near 57.
Saturday Night
Mostly cloudy, with a low around 34.
Sunday
Mostly sunny, with a high near 48.
Sunday Night
Mostly cloudy, with a low around 37.
Monday
Partly sunny, with a high near 55.
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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:
4:51 pm CST Dec 15, 2025
Forecast Valid:
6pm CST Dec 15, 2025-6pm CST Dec 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