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.

Overcast

72°F

22°C

Humidity 94%
Wind Speed N 7 mph
Barometer 29.92 in (1012.9 mb)
Dewpoint 70°F (21°C)
Visibility 9.00 mi
Last update 14 Jun 5:53 am CDT
Extended Forecast for

Herculaneum MO

  • Today

    Today: Scattered showers and thunderstorms, mainly between 2pm and 3pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 83. Calm wind becoming north 5 to 7 mph in the afternoon. Chance of precipitation is 30%.

    High: 83 °F

    Scattered
    T-storms and
    Patchy Fog

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 66. North wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Partly Cloudy
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 86. Light and variable wind.

    High: 86 °F

    Patchy Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Cloudy
    then Slight
    Chance
    Showers

  • Monday

    Monday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 83. Light south wind. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    T-storms

  • Monday Night

    Monday Night: A slight chance of thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 69. Chance of precipitation is 20%.

    Low: 69 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.

    Low: 73 °F

    Slight Chance
    T-storms

  • Wednesday

    Wednesday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 92. Chance of precipitation is 50%.

    High: 92 °F

    Chance
    Showers

Detailed Forecast

Today
Scattered showers and thunderstorms, mainly between 2pm and 3pm. Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 83. Calm wind becoming north 5 to 7 mph in the afternoon. Chance of precipitation is 30%.
Tonight
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 66. North wind around 5 mph becoming calm in the evening.
Sunday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 86. Light and variable wind.
Sunday Night
A 20 percent chance of showers after 1am. Mostly cloudy, with a low around 68. Calm wind.
Monday
A slight chance of showers, then a chance of showers and thunderstorms after 10am. Partly sunny, with a high near 83. Light south wind. Chance of precipitation is 30%.
Monday Night
A slight chance of thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 69. Chance of precipitation is 20%.
Tuesday
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 89.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Wednesday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 92. Chance of precipitation is 50%.
Wednesday Night
A 50 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 71.
Juneteenth
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Thursday Night
Mostly clear, with a low around 69.
Friday
Sunny, with a high near 92.
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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:
5:07 am CDT Jun 14, 2025
Forecast Valid:
6am CDT Jun 14, 2025-6pm CDT Jun 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