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.

Light Snow and Breezy

21°F

-6°C

Humidity 50%
Wind Speed W 23 G 49 mph
Barometer 30.12 in (1019.9 mb)
Dewpoint 5°F (-15°C)
Visibility 9.00 mi
Wind Chill5°F (-15°C)
Last update 29 Dec 2:53 am CST
Extended Forecast for

Arnold MO

Wind Advisory until December 29, 06:00am
Click here for hazard details and duration
Wind Advisory
  •  
    Wind Advisory until December 29, 06:00am

    NOW until 6:00am Mon

    Wind Advisory

  • Overnight

    Low: 17 °F

    Chance
    Flurries and
    Breezy

  • Monday

    Monday: Mostly sunny, with a high near 31. Northwest wind 13 to 18 mph, with gusts as high as 36 mph.

    High: 31 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 16. Northwest wind 7 to 11 mph, with gusts as high as 21 mph.

    Low: 16 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 39. West wind around 6 mph.

    High: 39 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 28. West wind around 6 mph.

    Low: 28 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 45.

    High: 45 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • New Year's Day

    New Year's Day: Partly sunny, with a high near 39.

    High: 39 °F

    Partly Sunny

Detailed Forecast

Overnight
A chance of flurries before 4am. Partly cloudy, with a low around 17. Breezy, with a west wind around 21 mph, with gusts as high as 37 mph.
Monday
Mostly sunny, with a high near 31. Northwest wind 13 to 18 mph, with gusts as high as 36 mph.
Monday Night
Mostly clear, with a low around 16. Northwest wind 7 to 11 mph, with gusts as high as 21 mph.
Tuesday
Increasing clouds, with a high near 39. West wind around 6 mph.
Tuesday Night
Mostly clear, with a low around 28. West wind around 6 mph.
Wednesday
Mostly sunny, with a high near 45.
Wednesday Night
Partly cloudy, with a low around 25.
New Year's Day
Partly sunny, with a high near 39.
Thursday Night
Mostly cloudy, with a low around 24.
Friday
Mostly cloudy, with a high near 41.
Friday Night
Mostly cloudy, with a low around 26.
Saturday
Sunny, with a high near 42.
Saturday Night
Partly cloudy, with a low around 24.
Sunday
Mostly sunny, with a high near 46.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Arnold MO
 38.42°N 90.35°W (Elev. 400 ft)
Last Update:
3:16 am CST Dec 29, 2025
Forecast Valid:
3am CST Dec 29, 2025-6pm CST Jan 4, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation