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.

Fair

67°F

19°C

Humidity 68%
Wind Speed S 6 mph
Barometer 29.99 in (1015.3 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 17 Oct 9:53 am CDT
Extended Forecast for

Herculaneum MO

  • Today

    Today: Mostly sunny, with a high near 84. South wind 7 to 9 mph.

    High: 84 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 64. South wind 5 to 7 mph.

    Low: 64 °F

    Partly Cloudy

  • Saturday

    Saturday: Showers and possibly a thunderstorm. High near 81. South wind 6 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    High: 81 °F

    Showers

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 47. Southwest wind 7 to 10 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 70%.

    Low: 47 °F

    Showers
    Likely

  • Sunday

    Sunday: Sunny, with a high near 65. Northwest wind 10 to 13 mph, with gusts as high as 24 mph.

    High: 65 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 42.

    Low: 42 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 75.

    High: 75 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 84. South wind 7 to 9 mph.
Tonight
Partly cloudy, with a low around 64. South wind 5 to 7 mph.
Saturday
Showers and possibly a thunderstorm. High near 81. South wind 6 to 9 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Saturday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 47. Southwest wind 7 to 10 mph becoming west after midnight. Winds could gust as high as 23 mph. Chance of precipitation is 70%.
Sunday
Sunny, with a high near 65. Northwest wind 10 to 13 mph, with gusts as high as 24 mph.
Sunday Night
Clear, with a low around 42.
Monday
Sunny, with a high near 75.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Sunny, with a high near 68.
Tuesday Night
Mostly clear, with a low around 40.
Wednesday
Sunny, with a high near 71.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 46.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Herculaneum MO
 38.27°N 90.39°W (Elev. 456 ft)
Last Update:
9:41 am CDT Oct 17, 2025
Forecast Valid:
10am CDT Oct 17, 2025-6pm CDT Oct 23, 2025
 
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