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

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

54°F

12°C

Humidity 34%
Wind Speed NW 13 mph
Barometer 30.03 in (1016.9 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Wind Chill50°F (10°C)
Last update 24 Mar 11:53 am CDT
Extended Forecast for

Herculaneum MO

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 62. West wind 5 to 8 mph.

    High: 62 °F

    Partly Sunny

  • Tonight

    Tonight: A 20 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 42. East wind 3 to 6 mph.

    Low: 42 °F

    Slight Chance
    Rain

  • Tuesday

    Tuesday: Mostly sunny, with a high near 68. Light and variable wind becoming northwest 5 to 9 mph in the morning.

    High: 68 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 36. Northwest wind 3 to 6 mph.

    Low: 36 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 65. Calm wind becoming northwest around 6 mph in the morning.

    High: 65 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

  • Thursday

    Thursday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 69. Chance of precipitation is 40%.

    High: 69 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 54.

    Low: 54 °F

    Chance
    T-storms

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 79.

    High: 79 °F

    Slight Chance
    T-storms

Detailed Forecast

This Afternoon
Partly sunny, with a high near 62. West wind 5 to 8 mph.
Tonight
A 20 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 42. East wind 3 to 6 mph.
Tuesday
Mostly sunny, with a high near 68. Light and variable wind becoming northwest 5 to 9 mph in the morning.
Tuesday Night
Partly cloudy, with a low around 36. Northwest wind 3 to 6 mph.
Wednesday
Sunny, with a high near 65. Calm wind becoming northwest around 6 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 42.
Thursday
A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 69. Chance of precipitation is 40%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 54.
Friday
A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 79.
Friday Night
A 50 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 58.
Saturday
Showers and thunderstorms likely. Partly sunny, with a high near 77. Chance of precipitation is 60%.
Saturday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 58. Chance of precipitation is 70%.
Sunday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 73.
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ABOUT THIS FORECAST

 
Point Forecast:
Herculaneum MO
 38.27°N 90.39°W (Elev. 456 ft)
Last Update:
11:21 am CDT Mar 24, 2025
Forecast Valid:
12pm CDT Mar 24, 2025-6pm CDT Mar 30, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation