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

Significant Coastal Impacts to the Eastern Seaboard; Tropical Storm Nolo to Impact Hawaii

A Nor'easter will bring significant coastal impacts to the Mid-Atlantic and New England through the weekend. Moderate to major coastal flooding, heavy rain, strong winds and high surf expected. Tropical Storm Nolo will continue to strengthen as it moves north toward the Big Island of Hawaii. Heavy rainfall may bring life-threatening, catastrophic flooding and mudslides through the weekend. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Overcast

71°F

22°C

Humidity 68%
Wind Speed NE 6 mph
Barometer 30.22 in (1023.2 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 25 Sep 1:53 pm CDT
Extended Forecast for

Arnold MO

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 73. Northeast wind around 5 mph.

    High: 73 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 59. Northeast wind around 5 mph becoming calm in the evening.

    Low: 59 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 71. Calm wind becoming east around 5 mph in the afternoon.

    High: 71 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 59. Light east wind. Chance of precipitation is 20%.

    Low: 59 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Sunday

    Sunday: Partly sunny, with a high near 74. Calm wind.

    High: 74 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

Detailed Forecast

This Afternoon
Partly sunny, with a high near 73. Northeast wind around 5 mph.
Tonight
Mostly cloudy, with a low around 59. Northeast wind around 5 mph becoming calm in the evening.
Saturday
Mostly cloudy, with a high near 71. Calm wind becoming east around 5 mph in the afternoon.
Saturday Night
A slight chance of showers between 2am and 3am. Mostly cloudy, with a low around 59. Light east wind. Chance of precipitation is 20%.
Sunday
Partly sunny, with a high near 74. Calm wind.
Sunday Night
Partly cloudy, with a low around 58.
Monday
Mostly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 57.
Tuesday
A 20 percent chance of showers after 1pm. Mostly sunny, with a high near 80.
Tuesday Night
A 30 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 65.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 78.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 65.
Thursday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 77.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Arnold MO
 38.45°N 90.38°W (Elev. 499 ft)
Last Update:
1:25 pm CDT Sep 25, 2026
Forecast Valid:
2pm CDT Sep 25, 2026-6pm CDT Oct 1, 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