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.

Fair

84°F

29°C

Humidity 55%
Wind Speed Vrbl 3 mph
Barometer 30.03 in (1016.5 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index86°F (30°C)
Last update 20 Sep 11:53 am CDT
Extended Forecast for

Affton MO

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms, mainly between 3pm and 4pm. Increasing clouds, with a high near 88. Southeast wind 3 to 6 mph.

    High: 88 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 50 percent chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 67. Southeast wind around 5 mph becoming light and variable after midnight.

    Low: 67 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. Light southwest wind increasing to 5 to 9 mph in the morning.

    High: 85 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7pm. Mostly cloudy, with a low around 67. South wind 3 to 6 mph. Chance of precipitation is 60%.

    Low: 67 °F

    Showers
    Likely

  • Monday

    Monday: Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. Mostly cloudy, with a high near 83. South wind 3 to 7 mph. Chance of precipitation is 60%.

    High: 83 °F

    Showers
    Likely then
    T-storms
    Likely

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.

    Low: 66 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. Chance of precipitation is 60%.

    High: 77 °F

    Chance
    T-storms then
    Showers
    Likely

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 76. Chance of precipitation is 60%.

    High: 76 °F

    Showers
    Likely

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly between 3pm and 4pm. Increasing clouds, with a high near 88. Southeast wind 3 to 6 mph.
Tonight
A 50 percent chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 67. Southeast wind around 5 mph becoming light and variable after midnight.
Sunday
A 50 percent chance of showers and thunderstorms, mainly after 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 85. Light southwest wind increasing to 5 to 9 mph in the morning.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7pm. Mostly cloudy, with a low around 67. South wind 3 to 6 mph. Chance of precipitation is 60%.
Monday
Showers likely and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. Mostly cloudy, with a high near 83. South wind 3 to 7 mph. Chance of precipitation is 60%.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66.
Tuesday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. Chance of precipitation is 60%.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Wednesday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 76. Chance of precipitation is 60%.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 73.
Thursday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 60.
Friday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 75.
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ABOUT THIS FORECAST

 
Point Forecast:
Affton MO
 38.56°N 90.32°W (Elev. 564 ft)
Last Update:
11:36 am CDT Sep 20, 2025
Forecast Valid:
12pm CDT Sep 20, 2025-6pm CDT Sep 26, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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