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

75°F

24°C

Humidity 55%
Wind Speed S 6 mph
Barometer 29.92 in (1012.7 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Last update 17 Oct 12:53 pm CDT
Extended Forecast for

Arnold MO

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 84. South wind around 10 mph.

    High: 84 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 65. South wind around 7 mph.

    Low: 65 °F

    Mostly Clear

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 10am. High near 74. South wind 6 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.

    High: 74 °F

    Showers

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm. Low around 49. Southwest wind 7 to 13 mph becoming west after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 90%.

    Low: 49 °F

    Showers

  • Sunday

    Sunday: Sunny, with a high near 65. Northwest wind 11 to 14 mph, with gusts as high as 26 mph.

    High: 65 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 44.

    Low: 44 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 49.

    Low: 49 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 84. South wind around 10 mph.
Tonight
Mostly clear, with a low around 65. South wind around 7 mph.
Saturday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 10am. High near 74. South wind 6 to 10 mph, with gusts as high as 22 mph. Chance of precipitation is 80%.
Saturday Night
Showers and possibly a thunderstorm. Low around 49. Southwest wind 7 to 13 mph becoming west after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 90%.
Sunday
Sunny, with a high near 65. Northwest wind 11 to 14 mph, with gusts as high as 26 mph.
Sunday Night
Clear, with a low around 44.
Monday
Sunny, with a high near 75.
Monday Night
Mostly clear, with a low around 49.
Tuesday
Sunny, with a high near 68.
Tuesday Night
Mostly clear, with a low around 41.
Wednesday
Sunny, with a high near 70.
Wednesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 48.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 68.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Arnold MO
 38.42°N 90.38°W (Elev. 495 ft)
Last Update:
11:41 am CDT Oct 17, 2025
Forecast Valid:
2pm CDT Oct 17, 2025-6pm CDT Oct 23, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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