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

88°F

31°C

Humidity 57%
Wind Speed N 8 mph
Barometer 29.92 in (1012.9 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index94°F (34°C)
Last update 13 Aug 2:53 pm CDT
Extended Forecast for

Herculaneum MO

  • This Afternoon

    This Afternoon: Isolated showers and thunderstorms. Partly sunny, with a high near 86. Light north wind. Chance of precipitation is 20%.

    High: 86 °F

    Isolated
    T-storms

  • Tonight

    Tonight: Isolated showers and thunderstorms before 8pm. Patchy fog after 3am. Otherwise, partly cloudy, with a low around 68. Light north wind. Chance of precipitation is 20%.

    Low: 68 °F

    Isolated
    T-storms then
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 9am. Otherwise, sunny, with a high near 88. Light and variable wind.

    High: 88 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 69. Calm wind.

    Low: 69 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 96. Calm wind.

    High: 96 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 72.

    Low: 72 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 97.

    High: 97 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 98.

    High: 98 °F

    Hot

Detailed Forecast

This Afternoon
Isolated showers and thunderstorms. Partly sunny, with a high near 86. Light north wind. Chance of precipitation is 20%.
Tonight
Isolated showers and thunderstorms before 8pm. Patchy fog after 3am. Otherwise, partly cloudy, with a low around 68. Light north wind. Chance of precipitation is 20%.
Thursday
Patchy fog before 9am. Otherwise, sunny, with a high near 88. Light and variable wind.
Thursday Night
Mostly clear, with a low around 69. Calm wind.
Friday
Sunny, with a high near 96. Calm wind.
Friday Night
Mostly clear, with a low around 72.
Saturday
Sunny and hot, with a high near 97.
Saturday Night
Mostly clear, with a low around 73.
Sunday
Sunny and hot, with a high near 98.
Sunday Night
Partly cloudy, with a low around 73.
Monday
Mostly sunny and hot, with a high near 97.
Monday Night
Partly cloudy, with a low around 73.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 94.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86.
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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:
2:26 pm CDT Aug 13, 2025
Forecast Valid:
3pm CDT Aug 13, 2025-6pm CDT Aug 20, 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