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

60°F

16°C

Humidity 90%
Wind Speed Calm
Barometer 30.21 in (1022.8 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 15 Oct 7:53 am CDT
Extended Forecast for

Arnold MO

  • Today

    Today: Sunny, with a high near 85. Calm wind.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 59. Calm wind.

    Low: 59 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 82. Calm wind becoming southeast 5 to 8 mph in the morning.

    High: 82 °F

    Sunny

  • Thursday Night

    Thursday Night: Increasing clouds, with a low around 59. Southeast wind around 6 mph.

    Low: 59 °F

    Increasing
    Clouds

  • Friday

    Friday: Partly sunny, with a high near 83. Southeast wind 5 to 9 mph.

    High: 83 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Mostly Clear
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 76. Chance of precipitation is 80%.

    High: 76 °F

    Showers

  • Saturday Night

    Saturday Night: Showers likely, mainly before 1am. Partly cloudy, with a low around 49. Chance of precipitation is 60%.

    Low: 49 °F

    Showers
    Likely

  • Sunday

    Sunday: A 20 percent chance of showers before 1pm. Sunny, with a high near 68.

    High: 68 °F

    Slight Chance
    Showers

Detailed Forecast

Today
Sunny, with a high near 85. Calm wind.
Tonight
Clear, with a low around 59. Calm wind.
Thursday
Sunny, with a high near 82. Calm wind becoming southeast 5 to 8 mph in the morning.
Thursday Night
Increasing clouds, with a low around 59. Southeast wind around 6 mph.
Friday
Partly sunny, with a high near 83. Southeast wind 5 to 9 mph.
Friday Night
A 30 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 64.
Saturday
Showers and possibly a thunderstorm. High near 76. Chance of precipitation is 80%.
Saturday Night
Showers likely, mainly before 1am. Partly cloudy, with a low around 49. Chance of precipitation is 60%.
Sunday
A 20 percent chance of showers before 1pm. Sunny, with a high near 68.
Sunday Night
Clear, with a low around 45.
Monday
Sunny, with a high near 76.
Monday Night
Mostly clear, with a low around 53.
Tuesday
A 20 percent chance of showers. Sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Arnold MO
 38.45°N 90.38°W (Elev. 499 ft)
Last Update:
7:31 am CDT Oct 15, 2025
Forecast Valid:
8am CDT Oct 15, 2025-6pm CDT Oct 21, 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