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.

Mostly Cloudy

60°F

16°C

Humidity 50%
Wind Speed SE 12 G 18 mph
Barometer 30.20 in (1022.5 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Last update 27 Mar 11:53 am CDT
Extended Forecast for

Herculaneum MO

  • This Afternoon

    This Afternoon: A slight chance of showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 74. South wind 6 to 11 mph. Chance of precipitation is 20%.

    High: 74 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 3am. Mostly cloudy, with a low around 58. South wind 6 to 8 mph. Chance of precipitation is 30%.

    Low: 58 °F

    Chance
    T-storms

  • Friday

    Friday: Mostly sunny, with a high near 81. Breezy, with a southwest wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 31 mph.

    High: 81 °F

    Sunny then
    Partly Sunny
    and Breezy

  • Friday Night

    Friday Night: A 30 percent chance of showers, mainly after 4am. Mostly cloudy, with a low around 59. South wind 8 to 13 mph, with gusts as high as 22 mph.

    Low: 59 °F

    Mostly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Showers likely before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Mostly cloudy, with a high near 73. South wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    High: 73 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers, with thunderstorms also possible after 7pm. Mostly cloudy, with a low around 60. Chance of precipitation is 50%.

    Low: 60 °F

    Chance
    Showers then
    Chance
    T-storms

  • Sunday

    Sunday: Showers and possibly a thunderstorm. High near 77. Chance of precipitation is 80%.

    High: 77 °F

    T-storms then
    Showers

  • Sunday Night

    Sunday Night: A 50 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 40.

    Low: 40 °F

    Chance
    T-storms

  • Monday

    Monday: Partly sunny, with a high near 55.

    High: 55 °F

    Partly Sunny

Detailed Forecast

This Afternoon
A slight chance of showers, with thunderstorms also possible after 4pm. Mostly cloudy, with a high near 74. South wind 6 to 11 mph. Chance of precipitation is 20%.
Tonight
A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 3am. Mostly cloudy, with a low around 58. South wind 6 to 8 mph. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 81. Breezy, with a southwest wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 31 mph.
Friday Night
A 30 percent chance of showers, mainly after 4am. Mostly cloudy, with a low around 59. South wind 8 to 13 mph, with gusts as high as 22 mph.
Saturday
Showers likely before 1pm, then a chance of showers and thunderstorms between 1pm and 4pm, then a chance of showers after 4pm. Mostly cloudy, with a high near 73. South wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Saturday Night
A chance of showers, with thunderstorms also possible after 7pm. Mostly cloudy, with a low around 60. Chance of precipitation is 50%.
Sunday
Showers and possibly a thunderstorm. High near 77. Chance of precipitation is 80%.
Sunday Night
A 50 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 40.
Monday
Partly sunny, with a high near 55.
Monday Night
Partly cloudy, with a low around 35.
Tuesday
Mostly sunny, with a high near 63.
Tuesday Night
Showers likely. Mostly cloudy, with a low around 50. Chance of precipitation is 60%.
Wednesday
Showers and thunderstorms likely. Partly sunny, with a high near 76. Chance of precipitation is 60%.
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ABOUT THIS FORECAST

 
Point Forecast:
Herculaneum MO
 38.27°N 90.39°W (Elev. 456 ft)
Last Update:
11:37 am CDT Mar 27, 2025
Forecast Valid:
12pm CDT Mar 27, 2025-6pm CDT Apr 2, 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