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

51°F

11°C

Humidity 61%
Wind Speed Calm
Barometer 30.11 in (1019.5 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 9 Jan 2:53 pm CST
Extended Forecast for

Herculaneum MO

  • Tonight

    Tonight: A 20 percent chance of rain after 3am. Mostly cloudy, with a low around 37. Northeast wind around 5 mph becoming calm.

    Low: 37 °F

    Mostly Cloudy
    then Slight
    Chance Rain

  • Saturday

    Saturday: A 20 percent chance of rain before 8am. Mostly cloudy through mid morning, then gradual clearing, with a high near 48. Northwest wind 6 to 15 mph, with gusts as high as 24 mph.

    High: 48 °F

    Slight Chance
    Rain then
    Sunny

  • Saturday Night

    Saturday Night: A chance of sprinkles, mixing with flurries after 10pm, then gradually ending. Partly cloudy, with a low around 24. Northwest wind 7 to 10 mph, with gusts as high as 26 mph.

    Low: 24 °F

    Chance
    Sprinkles/Flurries
    then Mostly
    Clear

  • Sunday

    Sunday: Sunny, with a high near 39. Northwest wind 3 to 8 mph. Winds could gust as high as 22 mph.

    High: 39 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 24. Light and variable wind.

    Low: 24 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 54.

    High: 54 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

  • Tuesday

    Tuesday: Partly sunny, with a high near 59.

    High: 59 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of rain after 3am. Mostly cloudy, with a low around 37. Northeast wind around 5 mph becoming calm.
Saturday
A 20 percent chance of rain before 8am. Mostly cloudy through mid morning, then gradual clearing, with a high near 48. Northwest wind 6 to 15 mph, with gusts as high as 24 mph.
Saturday Night
A chance of sprinkles, mixing with flurries after 10pm, then gradually ending. Partly cloudy, with a low around 24. Northwest wind 7 to 10 mph, with gusts as high as 26 mph.
Sunday
Sunny, with a high near 39. Northwest wind 3 to 8 mph. Winds could gust as high as 22 mph.
Sunday Night
Mostly clear, with a low around 24. Light and variable wind.
Monday
Sunny, with a high near 54.
Monday Night
Mostly clear, with a low around 36.
Tuesday
Partly sunny, with a high near 59.
Tuesday Night
Mostly cloudy, with a low around 37.
Wednesday
Mostly cloudy, with a high near 44.
Wednesday Night
Mostly cloudy, with a low around 21.
Thursday
Mostly sunny, with a high near 38.
Thursday Night
Partly cloudy, with a low around 24.
Friday
Partly sunny, with a high near 45.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Herculaneum MO
 38.27°N 90.39°W (Elev. 456 ft)
Last Update:
3:16 pm CST Jan 9, 2026
Forecast Valid:
3pm CST Jan 9, 2026-6pm CST Jan 16, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation