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.

Fog

47°F

8°C

Humidity 100%
Wind Speed E 7 mph
Barometer 29.96 in (1014.5 mb)
Dewpoint 47°F (8°C)
Visibility 0.50 mi
Wind Chill44°F (7°C)
Last update 27 Dec 7:53 am CST
Extended Forecast for

Arnold MO

Dense Fog Advisory December 27, 08:19am until December 27, 12:00pm
Click here for hazard details and duration
Dense Fog Advisory
  •  
    Dense Fog Advisory December 27, 08:19am until December 27, 12:00pm

    NOW until 12:00pm Sat

    Dense Fog Advisory

  • Today

    High: 65 °F

    Areas Dense
    Fog then
    Mostly Cloudy

  • Tonight

    Tonight: A slight chance of showers before 4am, then a slight chance of showers after 5am. Cloudy, with a low around 59. South wind around 7 mph. Chance of precipitation is 20%.

    Low: 59 °F

    Cloudy then
    Slight Chance
    Showers

  • Sunday

    Sunday: Showers, with thunderstorms also possible after 3pm. High near 74. South wind 6 to 14 mph becoming west in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 80%.

    High: 74 °F

    Chance
    Showers then
    Showers

  • Sunday Night

    Sunday Night: A 50 percent chance of showers before 9pm. Cloudy during the early evening, then gradual clearing, with a low around 18. West wind 14 to 18 mph, with gusts as high as 33 mph.

    Low: 18 °F

    Chance
    Showers then
    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 29. Northwest wind 13 to 17 mph, with gusts as high as 33 mph.

    High: 29 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 18.

    Low: 18 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 36.

    High: 36 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 26.

    Low: 26 °F

    Mostly Clear

Detailed Forecast

Today
Areas of dense fog before 10am. Otherwise, mostly cloudy, with a high near 65. Southeast wind 3 to 7 mph.
Tonight
A slight chance of showers before 4am, then a slight chance of showers after 5am. Cloudy, with a low around 59. South wind around 7 mph. Chance of precipitation is 20%.
Sunday
Showers, with thunderstorms also possible after 3pm. High near 74. South wind 6 to 14 mph becoming west in the afternoon. Winds could gust as high as 26 mph. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of showers before 9pm. Cloudy during the early evening, then gradual clearing, with a low around 18. West wind 14 to 18 mph, with gusts as high as 33 mph.
Monday
Mostly sunny, with a high near 29. Northwest wind 13 to 17 mph, with gusts as high as 33 mph.
Monday Night
Mostly clear, with a low around 18.
Tuesday
Sunny, with a high near 36.
Tuesday Night
Mostly clear, with a low around 26.
Wednesday
Mostly sunny, with a high near 46.
Wednesday Night
Partly cloudy, with a low around 24.
New Year's Day
Mostly sunny, with a high near 37.
Thursday Night
Partly cloudy, with a low around 16.
Friday
Partly sunny, with a high near 35.
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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:
8:01 am CST Dec 27, 2025
Forecast Valid:
8am CST Dec 27, 2025-6pm CST Jan 2, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation