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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

4 Miles WSW Arnold MO

  • Overnight

    Overnight: Rain and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 59. Southwest wind 6 to 8 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.

    Low: 59 °F

    Heavy Rain

  • Saturday

    Saturday: Rain, mainly before 8am. Temperature rising to near 66 by 10am, then falling to around 56 during the remainder of the day. Northwest wind 8 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 100%.

    High: 66 °F⇓

    Rain then
    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 38. Northwest wind 5 to 7 mph becoming calm after midnight.

    Low: 38 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 68. Calm wind becoming southwest around 6 mph.

    High: 68 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 48. South wind 3 to 6 mph.

    Low: 48 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain and thunderstorms after midnight. Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear
    then Chance
    Rain

  • Tuesday

    Tuesday: Rain likely and possibly a thunderstorm. Partly sunny, with a high near 80. Chance of precipitation is 70%.

    High: 80 °F

    Rain Likely

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 53. Chance of precipitation is 90%.

    Low: 53 °F

    Rain

Detailed Forecast

Overnight
Rain and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 59. Southwest wind 6 to 8 mph, with gusts as high as 24 mph. Chance of precipitation is 100%.
Saturday
Rain, mainly before 8am. Temperature rising to near 66 by 10am, then falling to around 56 during the remainder of the day. Northwest wind 8 to 15 mph, with gusts as high as 28 mph. Chance of precipitation is 100%.
Saturday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 38. Northwest wind 5 to 7 mph becoming calm after midnight.
Sunday
Sunny, with a high near 68. Calm wind becoming southwest around 6 mph.
Sunday Night
Clear, with a low around 48. South wind 3 to 6 mph.
Monday
Sunny, with a high near 80.
Monday Night
A 30 percent chance of rain and thunderstorms after midnight. Mostly clear, with a low around 59.
Tuesday
Rain likely and possibly a thunderstorm. Partly sunny, with a high near 80. Chance of precipitation is 70%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 53. Chance of precipitation is 90%.
Wednesday
Rain and possibly a thunderstorm before noon, then a chance of rain. High near 66. Chance of precipitation is 90%.
Wednesday Night
Partly cloudy, with a low around 34.
Thursday
Mostly sunny, with a high near 56.
Thursday Night
Mostly cloudy, with a low around 41.
Friday
Partly sunny, with a high near 67.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Arnold MO
 38.4°N 90.44°W (Elev. 525 ft)
Last Update:
3:31 am CST Mar 7, 2026
Forecast Valid:
4am CST Mar 7, 2026-6pm CDT Mar 13, 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