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

36°F

2°C

Humidity 73%
Wind Speed SW 5 mph
Barometer 29.92 in (1013.3 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 6 Dec 1:53 am CST
Extended Forecast for

Affton MO

  • Overnight

    Overnight: Partly cloudy, with a low around 31. West wind around 5 mph.

    Low: 31 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 44. Calm wind becoming southeast around 6 mph in the afternoon.

    High: 44 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A slight chance of rain between 11pm and 2am. Mostly cloudy, with a low around 37. Southeast wind around 6 mph becoming south after midnight. Chance of precipitation is 20%.

    Low: 37 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A 20 percent chance of rain before noon. Mostly cloudy, with a temperature rising to near 39 by 10am, then falling to around 32 during the remainder of the day. Light and variable wind becoming north 5 to 10 mph in the morning. Winds could gust as high as 20 mph.

    High: 39 °F⇓

    Slight Chance
    Rain then
    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 19. North wind 5 to 9 mph becoming light after midnight.

    Low: 19 °F

    Slight Chance
    Snow then
    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 33.

    High: 33 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 39.

    Low: 39 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 31. West wind around 5 mph.
Saturday
Mostly sunny, with a high near 44. Calm wind becoming southeast around 6 mph in the afternoon.
Saturday Night
A slight chance of rain between 11pm and 2am. Mostly cloudy, with a low around 37. Southeast wind around 6 mph becoming south after midnight. Chance of precipitation is 20%.
Sunday
A 20 percent chance of rain before noon. Mostly cloudy, with a temperature rising to near 39 by 10am, then falling to around 32 during the remainder of the day. Light and variable wind becoming north 5 to 10 mph in the morning. Winds could gust as high as 20 mph.
Sunday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 19. North wind 5 to 9 mph becoming light after midnight.
Monday
Mostly sunny, with a high near 33.
Monday Night
Partly cloudy, with a low around 25.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Mostly cloudy, with a low around 39.
Wednesday
Partly sunny, with a high near 46.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
A slight chance of rain and snow. Mostly cloudy, with a high near 38. Chance of precipitation is 20%.
Thursday Night
Mostly cloudy, with a low around 24.
Friday
Mostly sunny, with a high near 30.
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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:
12:36 am CST Dec 6, 2025
Forecast Valid:
2am CST Dec 6, 2025-6pm CST Dec 12, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation