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.

Partly Cloudy

75°F

24°C

Humidity 84%
Wind Speed SE 9 mph
Barometer 29.96 in (1014.0 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 25 Jun 7:53 pm CDT
Extended Forecast for

Arnold MO

Flood Watch June 25, 08:38pm until June 26, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 25, 08:38pm until June 26, 07:00pm

    NOW until 7:00pm Fri

    Flood Watch

  • Tonight

    Low: 69 °F

    Showers

  • Friday

    Friday: Showers and thunderstorms before 1pm, then showers and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms likely after 4pm. High near 82. South wind 6 to 8 mph becoming west in the afternoon. Chance of precipitation is 90%.

    High: 82 °F

    Showers then
    T-storms

  • Friday Night

    Friday Night: A 50 percent chance of showers and thunderstorms, mainly after 5am. Increasing clouds, with a low around 68. Southwest wind around 6 mph becoming calm in the evening.

    Low: 68 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. Calm wind. Chance of precipitation is 40%.

    High: 86 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 72. Light southeast wind.

    Low: 72 °F

    Chance
    T-storms

  • Sunday

    Sunday: Sunny, with a high near 95.

    High: 95 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 76.

    Low: 76 °F

    Mostly Clear

  • Monday

    Monday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

Detailed Forecast

Tonight
Showers and possibly a thunderstorm. Low around 69. Light east wind. Chance of precipitation is 90%.
Friday
Showers and thunderstorms before 1pm, then showers and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms likely after 4pm. High near 82. South wind 6 to 8 mph becoming west in the afternoon. Chance of precipitation is 90%.
Friday Night
A 50 percent chance of showers and thunderstorms, mainly after 5am. Increasing clouds, with a low around 68. Southwest wind around 6 mph becoming calm in the evening.
Saturday
A chance of showers before 7am, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 86. Calm wind. Chance of precipitation is 40%.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 72. Light southeast wind.
Sunday
Sunny, with a high near 95.
Sunday Night
Mostly clear, with a low around 76.
Monday
Sunny and hot, with a high near 97.
Monday Night
Mostly clear, with a low around 77.
Tuesday
Sunny and hot, with a high near 98.
Tuesday Night
Clear, with a low around 77.
Wednesday
Sunny and hot, with a high near 98.
Wednesday Night
Mostly clear, with a low around 77.
Thursday
Sunny, with a high near 96.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Arnold MO
 38.42°N 90.38°W (Elev. 495 ft)
Last Update:
5:26 pm CDT Jun 25, 2026
Forecast Valid:
8pm CDT Jun 25, 2026-6pm CDT Jul 2, 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