National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

NWS St. Louis Announces Changes To May 16, 2025 Tornado Damage Assessment

After a year-long review of new ground survey data and aerial imagery, NWS St. Louis made several adjustments to the May 16, 2025 tornado damage assessment. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

69°F

21°C

Humidity 87%
Wind Speed S 6 mph
Barometer 29.92 in (1012.8 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 17 May 6:53 am CDT
Extended Forecast for

Arnold MO

  • Today

    Today: Mostly sunny, with a high near 91. South wind 7 to 15 mph, with gusts as high as 25 mph.

    High: 91 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 72. South wind 9 to 11 mph, with gusts as high as 22 mph.

    Low: 72 °F

    Partly Cloudy

  • Monday

    Monday: A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Increasing clouds, with a high near 89. South wind 11 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    High: 89 °F

    Chance
    T-storms then
    Showers
    Likely

  • Monday Night

    Monday Night: Partly cloudy, with a low around 70. South wind around 11 mph, with gusts as high as 23 mph.

    Low: 70 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 88. Southwest wind 8 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 100%.

    High: 88 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 58. Chance of precipitation is 70%.

    Low: 58 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A 20 percent chance of showers. Mostly cloudy, with a high near 72.

    High: 72 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Slight Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 74.

    High: 74 °F

    Partly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 91. South wind 7 to 15 mph, with gusts as high as 25 mph.
Tonight
Partly cloudy, with a low around 72. South wind 9 to 11 mph, with gusts as high as 22 mph.
Monday
A chance of showers before 10am, then a chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Increasing clouds, with a high near 89. South wind 11 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Monday Night
Partly cloudy, with a low around 70. South wind around 11 mph, with gusts as high as 23 mph.
Tuesday
Showers and possibly a thunderstorm. High near 88. Southwest wind 8 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 100%.
Tuesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 58. Chance of precipitation is 70%.
Wednesday
A 20 percent chance of showers. Mostly cloudy, with a high near 72.
Wednesday Night
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 52.
Thursday
Partly sunny, with a high near 74.
Thursday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 55.
Friday
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 78.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 59.
Saturday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Arnold MO
 38.42°N 90.35°W (Elev. 400 ft)
Last Update:
4:26 am CDT May 17, 2026
Forecast Valid:
7am CDT May 17, 2026-6pm CDT May 23, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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