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

45°F

7°C

Humidity 86%
Wind Speed S 3 mph
Barometer 29.71 in (1006.2 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 5 Jan 10:53 pm CST
Extended Forecast for

3 Miles WSW Arnold MO

  • Overnight

    Overnight: Mostly cloudy, with a low around 46. South wind around 8 mph.

    Low: 46 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 62. West wind 7 to 10 mph, with gusts as high as 21 mph.

    High: 62 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 36. Northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 36 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 61. Calm wind becoming south around 6 mph in the afternoon.

    High: 61 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 45. South wind around 6 mph.

    Low: 45 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Thursday

    Thursday: Rain. High near 61. Chance of precipitation is 90%.

    High: 61 °F

    Rain

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before midnight, then a chance of rain after midnight. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.

    Low: 54 °F

    Showers
    Likely then
    Chance Rain

  • Friday

    Friday: A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 62.

    High: 62 °F

    Chance Rain

  • Friday Night

    Friday Night: A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 37.

    Low: 37 °F

    Slight Chance
    Rain then
    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 46. South wind around 8 mph.
Tuesday
Mostly sunny, with a high near 62. West wind 7 to 10 mph, with gusts as high as 21 mph.
Tuesday Night
Mostly clear, with a low around 36. Northwest wind 5 to 7 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 61. Calm wind becoming south around 6 mph in the afternoon.
Wednesday Night
A 20 percent chance of rain after midnight. Mostly cloudy, with a low around 45. South wind around 6 mph.
Thursday
Rain. High near 61. Chance of precipitation is 90%.
Thursday Night
Showers likely and possibly a thunderstorm before midnight, then a chance of rain after midnight. Mostly cloudy, with a low around 54. Chance of precipitation is 60%.
Friday
A 30 percent chance of rain, mainly after noon. Partly sunny, with a high near 62.
Friday Night
A 20 percent chance of rain before midnight. Mostly cloudy, with a low around 37.
Saturday
Mostly sunny, with a high near 46.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Mostly sunny, with a high near 39.
Sunday Night
Mostly clear, with a low around 24.
Monday
Sunny, with a high near 49.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WSW Arnold MO
 38.4°N 90.41°W (Elev. 656 ft)
Last Update:
11:36 pm CST Jan 5, 2026
Forecast Valid:
12am CST Jan 6, 2026-6pm CST Jan 12, 2026
 
Forecast Discussion
 
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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