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

68°F

20°C

Humidity 76%
Wind Speed S 6 mph
Barometer 29.93 in (1013.3 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 16 Apr 9:53 pm CDT
Extended Forecast for

3 Miles WSW Arnold MO

  • Tonight

    Tonight: Mostly clear, with a low around 60. Light south wind.

    Low: 60 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 85. South wind 5 to 11 mph, with gusts as high as 23 mph.

    High: 85 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Showers and thunderstorms, mainly before 1am, then showers and possibly a thunderstorm after 1am. Low around 48. South wind around 10 mph becoming west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 100%.

    Low: 48 °F

    T-storms
    Likely then
    T-storms

  • Saturday

    Saturday: Showers likely, mainly before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 60. Northwest wind around 11 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

    High: 60 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 39. Northwest wind 5 to 9 mph.

    Low: 39 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 66.

    High: 66 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 42.

    Low: 42 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 60. Light south wind.
Friday
Mostly sunny, with a high near 85. South wind 5 to 11 mph, with gusts as high as 23 mph.
Friday Night
Showers and thunderstorms, mainly before 1am, then showers and possibly a thunderstorm after 1am. Low around 48. South wind around 10 mph becoming west after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 100%.
Saturday
Showers likely, mainly before 7am. Mostly cloudy, then gradually becoming sunny, with a high near 60. Northwest wind around 11 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.
Saturday Night
Mostly clear, with a low around 39. Northwest wind 5 to 9 mph.
Sunday
Sunny, with a high near 66.
Sunday Night
Mostly clear, with a low around 42.
Monday
Sunny, with a high near 74.
Monday Night
Mostly clear, with a low around 52.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
Mostly clear, with a low around 56.
Wednesday
Mostly sunny, with a high near 79.
Wednesday Night
Mostly clear, with a low around 56.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Arnold MO
 38.4°N 90.41°W (Elev. 656 ft)
Last Update:
9:01 pm CDT Apr 16, 2026
Forecast Valid:
10pm CDT Apr 16, 2026-6pm CDT Apr 23, 2026
 
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