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

28°F

-2°C

Humidity 43%
Wind Speed NW 20 G 33 mph
Barometer 30.50 in (1033.2 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill15°F (-9°C)
Last update 22 Feb 8:53 pm CST
Extended Forecast for

Arnold MO

  • Tonight

    Tonight: Partly cloudy, with a low around 14. Northwest wind around 14 mph, with gusts as high as 29 mph.

    Low: 14 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 32. Northwest wind 7 to 14 mph, with gusts as high as 24 mph.

    High: 32 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 20. Calm wind becoming south around 6 mph after midnight.

    Low: 20 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 55. South wind 7 to 13 mph, with gusts as high as 24 mph.

    High: 55 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 36. Southwest wind 5 to 8 mph becoming calm after midnight.

    Low: 36 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of rain, then rain likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 37. Chance of precipitation is 60%.

    Low: 37 °F

    Rain Likely

  • Thursday

    Thursday: A 30 percent chance of rain before noon. Mostly sunny, with a high near 54.

    High: 54 °F

    Chance Rain
    then Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 29.

    Low: 29 °F

    Mostly Clear

Detailed Forecast

Tonight
Partly cloudy, with a low around 14. Northwest wind around 14 mph, with gusts as high as 29 mph.
Monday
Sunny, with a high near 32. Northwest wind 7 to 14 mph, with gusts as high as 24 mph.
Monday Night
Mostly clear, with a low around 20. Calm wind becoming south around 6 mph after midnight.
Tuesday
Partly sunny, with a high near 55. South wind 7 to 13 mph, with gusts as high as 24 mph.
Tuesday Night
Mostly cloudy, with a low around 36. Southwest wind 5 to 8 mph becoming calm after midnight.
Wednesday
Mostly sunny, with a high near 57.
Wednesday Night
A chance of rain, then rain likely and possibly a thunderstorm after midnight. Mostly cloudy, with a low around 37. Chance of precipitation is 60%.
Thursday
A 30 percent chance of rain before noon. Mostly sunny, with a high near 54.
Thursday Night
Mostly clear, with a low around 29.
Friday
Sunny, with a high near 66.
Friday Night
Mostly clear, with a low around 39.
Saturday
Sunny, with a high near 66.
Saturday Night
A 20 percent chance of rain. Partly cloudy, with a low around 32.
Sunday
A slight chance of rain and snow. Partly sunny, with a high near 52. Chance of precipitation is 20%.
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 90.35°W (Elev. 400 ft)
Last Update:
7:16 pm CST Feb 22, 2026
Forecast Valid:
9pm CST Feb 22, 2026-6pm CST Mar 1, 2026
 
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