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

28°F

-2°C

Humidity 44%
Wind Speed N 10 G 18 mph
Barometer 30.56 in (1035.3 mb)
Dewpoint 9°F (-13°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 23 Feb 12:53 pm CST
Extended Forecast for

Herculaneum MO

  • This Afternoon

    This Afternoon: Sunny, with a high near 32. Northwest wind 3 to 7 mph.

    High: 32 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 16. Calm wind becoming south around 5 mph after midnight.

    Low: 16 °F

    Mostly Clear

  • Tuesday

    Tuesday: Increasing clouds, with a high near 56. Southwest wind 6 to 15 mph, with gusts as high as 38 mph.

    High: 56 °F

    Increasing
    Clouds

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 35. Southwest wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 20 mph.

    Low: 35 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 56. Calm wind becoming east around 5 mph in the afternoon.

    High: 56 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 37.

    Low: 37 °F

    Slight Chance
    Rain then
    Chance Rain

  • Thursday

    Thursday: A 30 percent chance of rain before noon. Partly sunny, with a high near 51.

    High: 51 °F

    Chance Rain
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 31.

    Low: 31 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 32. Northwest wind 3 to 7 mph.
Tonight
Mostly clear, with a low around 16. Calm wind becoming south around 5 mph after midnight.
Tuesday
Increasing clouds, with a high near 56. Southwest wind 6 to 15 mph, with gusts as high as 38 mph.
Tuesday Night
Mostly cloudy, with a low around 35. Southwest wind 5 to 8 mph becoming calm after midnight. Winds could gust as high as 20 mph.
Wednesday
Partly sunny, with a high near 56. Calm wind becoming east around 5 mph in the afternoon.
Wednesday Night
A 50 percent chance of rain, mainly after midnight. Mostly cloudy, with a low around 37.
Thursday
A 30 percent chance of rain before noon. Partly sunny, with a high near 51.
Thursday Night
Mostly clear, with a low around 31.
Friday
Sunny, with a high near 65.
Friday Night
Clear, with a low around 40.
Saturday
Sunny, with a high near 69.
Saturday Night
Mostly cloudy, with a low around 33.
Sunday
A chance of rain and snow. Partly sunny, with a high near 50. Chance of precipitation is 30%.
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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:
12:26 pm CST Feb 23, 2026
Forecast Valid:
1pm CST Feb 23, 2026-6pm CST Mar 1, 2026
 
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