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.

Overcast

62°F

17°C

Humidity 86%
Wind Speed S 14 mph
Barometer 29.57 in (1001.2 mb)
Dewpoint 58°F (14°C)
Visibility 8.00 mi
Last update 8 Jan 2:53 pm CST
Extended Forecast for

Arnold MO

  • This Afternoon

    This Afternoon: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4pm. High near 65. South wind 14 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 80%.

    High: 65 °F

    Showers

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 10pm, then a slight chance of showers between 10pm and midnight. Low around 46. South wind 11 to 16 mph becoming west after midnight. Winds could gust as high as 33 mph. Chance of precipitation is 80%.

    Low: 46 °F

    Showers then
    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a steady temperature around 50. West wind 5 to 13 mph becoming north in the afternoon. Winds could gust as high as 25 mph.

    High: 50 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 38. Light and variable wind.

    Low: 38 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Saturday

    Saturday: Mostly sunny, with a high near 47. Northwest wind 5 to 10 mph, with gusts as high as 21 mph.

    High: 47 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 37.

    High: 37 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 24.

    Low: 24 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 52.

    High: 52 °F

    Sunny

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4pm. High near 65. South wind 14 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 80%.
Tonight
Showers and possibly a thunderstorm before 10pm, then a slight chance of showers between 10pm and midnight. Low around 46. South wind 11 to 16 mph becoming west after midnight. Winds could gust as high as 33 mph. Chance of precipitation is 80%.
Friday
Mostly cloudy, with a steady temperature around 50. West wind 5 to 13 mph becoming north in the afternoon. Winds could gust as high as 25 mph.
Friday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 38. Light and variable wind.
Saturday
Mostly sunny, with a high near 47. Northwest wind 5 to 10 mph, with gusts as high as 21 mph.
Saturday Night
Partly cloudy, with a low around 23.
Sunday
Sunny, with a high near 37.
Sunday Night
Mostly clear, with a low around 24.
Monday
Sunny, with a high near 52.
Monday Night
Mostly clear, with a low around 36.
Tuesday
Partly sunny, with a high near 57.
Tuesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 36.
Wednesday
Mostly cloudy, with a high near 43.
Wednesday Night
Mostly cloudy, with a low around 24.
Thursday
Mostly sunny, with a high near 39.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Arnold MO
 38.4°N 90.38°W (Elev. 495 ft)
Last Update:
3:16 pm CST Jan 8, 2026
Forecast Valid:
3pm CST Jan 8, 2026-6pm CST Jan 15, 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