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.

Partly Cloudy

76°F

24°C

Humidity 60%
Wind Speed S 10 mph
Barometer 29.93 in (1013.1 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 3 Apr 8:53 pm CDT
Extended Forecast for

Arnold MO

  • Tonight

    Tonight: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3am. Low around 54. South wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.

    Low: 54 °F

    Chance
    T-storms then
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms before 11am, then a slight chance of showers between 11am and 1pm. Temperature falling to around 55 by 1pm. Northwest wind 7 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.

    High: 61 °F⇓

    Showers then
    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming clear, with a low around 40. Northwest wind 7 to 11 mph, with gusts as high as 22 mph.

    Low: 40 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 61. Northwest wind 7 to 9 mph.

    High: 61 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 40. Northwest wind around 5 mph becoming calm in the evening.

    Low: 40 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 56.

    High: 56 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 40.

    Low: 40 °F

    Partly Cloudy

Detailed Forecast

Tonight
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3am. Low around 54. South wind 10 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 80%.
Saturday
Showers and thunderstorms before 11am, then a slight chance of showers between 11am and 1pm. Temperature falling to around 55 by 1pm. Northwest wind 7 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Saturday Night
Mostly cloudy, then gradually becoming clear, with a low around 40. Northwest wind 7 to 11 mph, with gusts as high as 22 mph.
Sunday
Sunny, with a high near 61. Northwest wind 7 to 9 mph.
Sunday Night
Clear, with a low around 40. Northwest wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 65.
Monday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 38.
Tuesday
Mostly cloudy, with a high near 56.
Tuesday Night
Partly cloudy, with a low around 40.
Wednesday
Partly sunny, with a high near 74.
Wednesday Night
Mostly clear, with a low around 54.
Thursday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 77.
Thursday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 56.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Arnold MO
 38.42°N 90.38°W (Elev. 495 ft)
Last Update:
8:06 pm CDT Apr 3, 2026
Forecast Valid:
9pm CDT Apr 3, 2026-6pm CDT Apr 10, 2026
 
Forecast Discussion
 
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Additional Resources

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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