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

54°F

12°C

Humidity 55%
Wind Speed N 8 mph
Barometer 30.08 in (1018.5 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Wind Chill52°F (11°C)
Last update 29 Apr 10:53 pm CDT
Extended Forecast for

Herculaneum MO

Flood Warning April 29, 11:55pm until May 3, 10:36pm
Click here for hazard details and duration
Flood Warning
  •  
    Flood Warning April 29, 11:55pm until May 3, 10:36pm

    NOW until 10:36pm Sun

    Flood Warning

  • Tonight

    Low: 40 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 68. Calm wind.

    High: 68 °F

    Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers, mainly before 1am. Partly cloudy, with a low around 44. Calm wind.

    Low: 44 °F

    Chance
    Showers

  • Friday

    Friday: Mostly sunny, with a high near 64. Calm wind becoming north 5 to 7 mph in the morning.

    High: 64 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 39. North wind around 5 mph becoming calm in the evening.

    Low: 39 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 62.

    High: 62 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 74.

    High: 74 °F

    Sunny

Detailed Forecast

Tonight
Mostly cloudy early, then becoming clear, with a low around 40. Calm wind.
Thursday
Sunny, with a high near 68. Calm wind.
Thursday Night
A 30 percent chance of showers, mainly before 1am. Partly cloudy, with a low around 44. Calm wind.
Friday
Mostly sunny, with a high near 64. Calm wind becoming north 5 to 7 mph in the morning.
Friday Night
Partly cloudy, with a low around 39. North wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 62.
Saturday Night
Mostly clear, with a low around 38.
Sunday
Sunny, with a high near 74.
Sunday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 53. Chance of precipitation is 30%.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 79.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 51.
Tuesday
A 30 percent chance of showers. Mostly sunny, with a high near 76.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 54.
Wednesday
Showers and thunderstorms likely. Partly sunny, with a high near 75. Chance of precipitation is 60%.
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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:
11:11 pm CDT Apr 29, 2026
Forecast Valid:
11pm CDT Apr 29, 2026-6pm CDT May 6, 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