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

48°F

9°C

Humidity 77%
Wind Speed S 8 mph
Barometer 29.82 in (1009.8 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill44°F (7°C)
Last update 8 Jan 4:53 am CST
Extended Forecast for

Herculaneum MO

  • Today

    Today: A chance of rain before 3pm, then a chance of rain and thunderstorms between 3pm and 4pm, then rain likely and possibly a thunderstorm after 4pm. Cloudy, with a high near 65. South wind 6 to 16 mph, with gusts as high as 34 mph. Chance of precipitation is 70%.

    High: 65 °F

    Chance Rain
    then Rain
    Likely

  • Tonight

    Tonight: Rain and possibly a thunderstorm before 11pm, then a slight chance of rain between 11pm and midnight. Low around 47. South wind 10 to 15 mph becoming west after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 80%.

    Low: 47 °F

    Rain then
    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 55. West wind 5 to 11 mph becoming north in the afternoon. Winds could gust as high as 25 mph.

    High: 55 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 37. Calm wind becoming northwest around 5 mph after midnight.

    Low: 37 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday

    Saturday: Partly sunny, with a high near 46. Northwest wind 6 to 10 mph, with gusts as high as 22 mph.

    High: 46 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 23.

    Low: 23 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 36.

    High: 36 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 22.

    Low: 22 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 50.

    High: 50 °F

    Sunny

Detailed Forecast

Today
A chance of rain before 3pm, then a chance of rain and thunderstorms between 3pm and 4pm, then rain likely and possibly a thunderstorm after 4pm. Cloudy, with a high near 65. South wind 6 to 16 mph, with gusts as high as 34 mph. Chance of precipitation is 70%.
Tonight
Rain and possibly a thunderstorm before 11pm, then a slight chance of rain between 11pm and midnight. Low around 47. South wind 10 to 15 mph becoming west after midnight. Winds could gust as high as 34 mph. Chance of precipitation is 80%.
Friday
Partly sunny, with a high near 55. West wind 5 to 11 mph becoming north in the afternoon. Winds could gust as high as 25 mph.
Friday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 37. Calm wind becoming northwest around 5 mph after midnight.
Saturday
Partly sunny, with a high near 46. Northwest wind 6 to 10 mph, with gusts as high as 22 mph.
Saturday Night
Partly cloudy, with a low around 23.
Sunday
Sunny, with a high near 36.
Sunday Night
Mostly clear, with a low around 22.
Monday
Sunny, with a high near 50.
Monday Night
Mostly clear, with a low around 34.
Tuesday
Mostly sunny, with a high near 57.
Tuesday Night
Mostly cloudy, with a low around 35.
Wednesday
Mostly cloudy, with a high near 45.
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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:
4:46 am CST Jan 8, 2026
Forecast Valid:
5am CST Jan 8, 2026-6pm CST Jan 14, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation