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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Overcast

64°F

18°C

Humidity 87%
Wind Speed SE 10 mph
Barometer 30.07 in (1018.3 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 20 Apr 10:53 am CDT
Extended Forecast for

Affton MO

Flood Watch April 20, 11:24am until April 21, 01:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch April 20, 11:24am until April 21, 01:00am

    NOW until 1:00am Mon

    Flood Watch

  • Today

    High: 77 °F

    Mostly Cloudy

  • Tonight

    Tonight: Showers and thunderstorms, mainly before 11pm. Low around 52. South wind 13 to 16 mph becoming west after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 100%.

    Low: 52 °F

    T-storms then
    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 69. West wind 9 to 11 mph, with gusts as high as 22 mph.

    High: 69 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 49. West wind around 5 mph becoming calm in the evening.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 79. Calm wind becoming south 5 to 7 mph in the morning.

    High: 79 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 55.

    Low: 55 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.

    Low: 60 °F

    Chance
    Showers

Detailed Forecast

Today
Mostly cloudy, with a high near 77. Southeast wind 6 to 15 mph, with gusts as high as 29 mph.
Tonight
Showers and thunderstorms, mainly before 11pm. Low around 52. South wind 13 to 16 mph becoming west after midnight. Winds could gust as high as 26 mph. Chance of precipitation is 100%.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 69. West wind 9 to 11 mph, with gusts as high as 22 mph.
Monday Night
Mostly clear, with a low around 49. West wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 79. Calm wind becoming south 5 to 7 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 55.
Wednesday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 80.
Wednesday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Thursday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 60%.
Thursday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Friday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 75. Chance of precipitation is 70%.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58.
Saturday
A 40 percent chance of showers. Partly sunny, with a high near 71.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Affton MO
 38.56°N 90.32°W (Elev. 564 ft)
Last Update:
10:37 am CDT Apr 20, 2025
Forecast Valid:
11am CDT Apr 20, 2025-6pm CDT Apr 26, 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