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.

Fair

57°F

14°C

Humidity 100%
Wind Speed Calm
Barometer 30.22 in (1023.2 mb)
Dewpoint 57°F (14°C)
Visibility 9.00 mi
Last update 25 Sep 1:53 am CDT
Extended Forecast for

4 Miles WSW Arnold MO

  • Overnight

    Overnight: Mostly cloudy, with a low around 57. Calm wind.

    Low: 57 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 76. Light east wind.

    High: 76 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 60. Light east wind.

    Low: 60 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 73. Light east wind.

    High: 73 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 59. Calm wind.

    Low: 59 °F

    Mostly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 76.

    High: 76 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 59.

    Low: 59 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 79.

    High: 79 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 57. Calm wind.
Friday
Mostly cloudy, with a high near 76. Light east wind.
Friday Night
Mostly cloudy, with a low around 60. Light east wind.
Saturday
A 20 percent chance of showers after 1pm. Mostly cloudy, with a high near 73. Light east wind.
Saturday Night
Mostly cloudy, with a low around 59. Calm wind.
Sunday
Mostly cloudy, with a high near 76.
Sunday Night
Partly cloudy, with a low around 59.
Monday
Mostly sunny, with a high near 79.
Monday Night
Partly cloudy, with a low around 60.
Tuesday
A 30 percent chance of showers after 1pm. Partly sunny, with a high near 81.
Tuesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Wednesday
Showers likely. Mostly cloudy, with a high near 79. Chance of precipitation is 60%.
Wednesday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 65.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles WSW Arnold MO
 38.4°N 90.44°W (Elev. 525 ft)
Last Update:
1:55 am CDT Sep 25, 2026
Forecast Valid:
2am 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