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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Herculaneum MO

  • Tonight

    Tonight: Rain, possibly mixed with snow before 1am, then rain, possibly mixed with sleet between 1am and 3am, then rain after 3am. Low around 34. East wind 8 to 11 mph. Chance of precipitation is 100%. Little or no snow and sleet accumulation expected.

    Low: 34 °F

    Wintry Mix

  • Monday

    Monday: Rain likely, mainly before 7am. Cloudy, with a high near 47. East wind 3 to 8 mph. Chance of precipitation is 70%.

    High: 47 °F

    Rain Likely
    then Cloudy

  • Monday Night

    Monday Night: Rain likely, mainly after midnight. Cloudy, with a low around 38. Light east wind. Chance of precipitation is 70%.

    Low: 38 °F

    Chance Rain
    then Rain
    Likely

  • Tuesday

    Tuesday: Rain likely, mainly before noon. Mostly cloudy, with a high near 69. South wind 3 to 7 mph. Chance of precipitation is 70%.

    High: 69 °F

    Rain Likely
    then Chance
    Rain

  • Tuesday Night

    Tuesday Night: Rain likely, mainly after midnight. Mostly cloudy, with a low around 54. South wind 3 to 5 mph. Chance of precipitation is 60%.

    Low: 54 °F

    Rain Likely

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm. High near 72. Chance of precipitation is 80%.

    High: 72 °F

    Rain

  • Wednesday Night

    Wednesday Night: Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.

    Low: 52 °F

    Rain Likely

  • Thursday

    Thursday: Rain likely, mainly before noon. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.

    High: 74 °F

    Rain Likely

  • Thursday Night

    Thursday Night: A 50 percent chance of rain and thunderstorms. Partly cloudy, with a low around 56.

    Low: 56 °F

    Chance Rain
    then Chance
    T-storms

Detailed Forecast

Tonight
Rain, possibly mixed with snow before 1am, then rain, possibly mixed with sleet between 1am and 3am, then rain after 3am. Low around 34. East wind 8 to 11 mph. Chance of precipitation is 100%. Little or no snow and sleet accumulation expected.
Monday
Rain likely, mainly before 7am. Cloudy, with a high near 47. East wind 3 to 8 mph. Chance of precipitation is 70%.
Monday Night
Rain likely, mainly after midnight. Cloudy, with a low around 38. Light east wind. Chance of precipitation is 70%.
Tuesday
Rain likely, mainly before noon. Mostly cloudy, with a high near 69. South wind 3 to 7 mph. Chance of precipitation is 70%.
Tuesday Night
Rain likely, mainly after midnight. Mostly cloudy, with a low around 54. South wind 3 to 5 mph. Chance of precipitation is 60%.
Wednesday
Rain and possibly a thunderstorm. High near 72. Chance of precipitation is 80%.
Wednesday Night
Rain likely and possibly a thunderstorm. Mostly cloudy, with a low around 52. Chance of precipitation is 70%.
Thursday
Rain likely, mainly before noon. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.
Thursday Night
A 50 percent chance of rain and thunderstorms. Partly cloudy, with a low around 56.
Friday
Rain likely and possibly a thunderstorm before noon, then a chance of rain and thunderstorms after noon. Partly sunny, with a high near 79. Chance of precipitation is 60%.
Friday Night
Rain and thunderstorms likely. Mostly cloudy, with a low around 46. Chance of precipitation is 60%.
Saturday
Rain likely. Mostly cloudy, with a high near 65. Chance of precipitation is 60%.
Saturday Night
A 30 percent chance of rain. Partly cloudy, with a low around 40.
Sunday
A 30 percent chance of rain. Mostly sunny, with a high near 70.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Herculaneum MO
 38.27°N 90.39°W (Elev. 456 ft)
Last Update:
7:36 pm CST Mar 1, 2026
Forecast Valid:
9pm CST Mar 1, 2026-6pm CDT Mar 8, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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