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.

Partly Cloudy

55°F

13°C

Humidity 37%
Wind Speed Calm
Barometer 29.76 in (1007.7 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 25 Feb 1:53 pm CST
Extended Forecast for

Arnold MO

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 54. Light east wind.

    High: 54 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 50 percent chance of rain, mainly before 3am. Mostly cloudy, with a low around 35. Light northeast wind.

    Low: 35 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 57. Light and variable wind.

    High: 57 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 34. Calm wind.

    Low: 34 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 71. Calm wind becoming southwest 5 to 8 mph in the morning.

    High: 71 °F

    Sunny

  • Friday Night

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

    Low: 42 °F

    Mostly Clear

  • Saturday

    Saturday: A 20 percent chance of rain before noon. Sunny, with a high near 67.

    High: 67 °F

    Slight Chance
    Rain then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

  • Sunday

    Sunday: A chance of rain before noon, then a chance of rain and snow. Cloudy, with a high near 46. Chance of precipitation is 40%.

    High: 46 °F

    Chance Rain
    then Chance
    Rain/Snow

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 54. Light east wind.
Tonight
A 50 percent chance of rain, mainly before 3am. Mostly cloudy, with a low around 35. Light northeast wind.
Thursday
Mostly sunny, with a high near 57. Light and variable wind.
Thursday Night
Clear, with a low around 34. Calm wind.
Friday
Sunny, with a high near 71. Calm wind becoming southwest 5 to 8 mph in the morning.
Friday Night
Mostly clear, with a low around 42.
Saturday
A 20 percent chance of rain before noon. Sunny, with a high near 67.
Saturday Night
Mostly cloudy, with a low around 32.
Sunday
A chance of rain before noon, then a chance of rain and snow. Cloudy, with a high near 46. Chance of precipitation is 40%.
Sunday Night
Rain and snow likely. Cloudy, with a low around 30. Chance of precipitation is 70%.
Monday
A chance of rain and snow. Cloudy, with a high near 42. Chance of precipitation is 30%.
Monday Night
A 40 percent chance of rain. Cloudy, with a low around 28.
Tuesday
A 50 percent chance of rain. Cloudy, with a high near 47.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Arnold MO
 38.42°N 90.35°W (Elev. 400 ft)
Last Update:
12:26 pm CST Feb 25, 2026
Forecast Valid:
2pm CST Feb 25, 2026-6pm CST Mar 3, 2026
 
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