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

37°F

3°C

Humidity 52%
Wind Speed W 9 mph
Barometer 30.33 in (1027.2 mb)
Dewpoint 21°F (-6°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 27 Nov 12:53 am CST
Extended Forecast for

Herculaneum MO

  • Overnight

    Overnight: Mostly cloudy, with a low around 30. Northwest wind around 5 mph.

    Low: 30 °F

    Mostly Cloudy

  • Thanksgiving Day

    Thanksgiving Day: Sunny, with a high near 41. Northwest wind 5 to 7 mph.

    High: 41 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 22. West wind around 5 mph becoming calm in the evening.

    Low: 22 °F

    Clear

  • Friday

    Friday: Increasing clouds, with a high near 41. Light and variable wind.

    High: 41 °F

    Increasing
    Clouds

  • Friday Night

    Friday Night: A 50 percent chance of snow after midnight. Cloudy, with a low around 29. Southeast wind 3 to 7 mph.

    Low: 29 °F

    Cloudy then
    Chance Snow

  • Saturday

    Saturday: Rain, possibly mixed with snow. High near 41. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    High: 41 °F

    Rain/Snow

  • Saturday Night

    Saturday Night: Rain likely, mainly before midnight. Cloudy, with a low around 25. Chance of precipitation is 60%.

    Low: 25 °F

    Rain Likely
    then Chance
    Rain

  • Sunday

    Sunday: Mostly cloudy, with a high near 33.

    High: 33 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 18.

    Low: 18 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 30. Northwest wind around 5 mph.
Thanksgiving Day
Sunny, with a high near 41. Northwest wind 5 to 7 mph.
Thursday Night
Clear, with a low around 22. West wind around 5 mph becoming calm in the evening.
Friday
Increasing clouds, with a high near 41. Light and variable wind.
Friday Night
A 50 percent chance of snow after midnight. Cloudy, with a low around 29. Southeast wind 3 to 7 mph.
Saturday
Rain, possibly mixed with snow. High near 41. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Saturday Night
Rain likely, mainly before midnight. Cloudy, with a low around 25. Chance of precipitation is 60%.
Sunday
Mostly cloudy, with a high near 33.
Sunday Night
Mostly cloudy, with a low around 18.
Monday
A 30 percent chance of snow, mainly after noon. Mostly cloudy, with a high near 29.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 18.
Tuesday
Mostly sunny, with a high near 35.
Tuesday Night
Partly cloudy, with a low around 19.
Wednesday
Mostly sunny, with a high near 43.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Herculaneum MO
 38.25°N 90.39°W (Elev. 499 ft)
Last Update:
10:26 pm CST Nov 26, 2025
Forecast Valid:
1am CST Nov 27, 2025-6pm CST Dec 3, 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