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

  • Today

    Today: A 20 percent chance of rain before 11am. Cloudy, with a temperature falling to around 49 by 5pm. West wind 9 to 16 mph, with gusts as high as 25 mph.

    High: 64 °F⇓

    Slight Chance
    Rain then
    Mostly Cloudy

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming mostly clear, with a low around 36. Northwest wind 5 to 7 mph becoming calm in the evening.

    Low: 36 °F

    Decreasing
    Clouds

  • Sunday

    Sunday: Sunny, with a high near 68. Calm wind becoming southwest around 5 mph.

    High: 68 °F

    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 47. Calm wind becoming south around 5 mph after midnight.

    Low: 47 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 79. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.

    High: 79 °F

    Sunny

  • Monday Night

    Monday Night: A 30 percent chance of rain and thunderstorms after midnight. Mostly clear, with a low around 59.

    Low: 59 °F

    Mostly Clear
    then Chance
    Rain

  • Tuesday

    Tuesday: Rain likely and possibly a thunderstorm. Partly sunny, with a high near 80. Chance of precipitation is 70%.

    High: 80 °F

    Rain Likely

  • Tuesday Night

    Tuesday Night: Rain and possibly a thunderstorm. Low around 53. Chance of precipitation is 90%.

    Low: 53 °F

    Rain

  • Wednesday

    Wednesday: Rain and possibly a thunderstorm before noon, then a chance of rain. High near 66. Chance of precipitation is 90%.

    High: 66 °F

    Rain then
    Chance Rain

Detailed Forecast

Today
A 20 percent chance of rain before 11am. Cloudy, with a temperature falling to around 49 by 5pm. West wind 9 to 16 mph, with gusts as high as 25 mph.
Tonight
Mostly cloudy, then gradually becoming mostly clear, with a low around 36. Northwest wind 5 to 7 mph becoming calm in the evening.
Sunday
Sunny, with a high near 68. Calm wind becoming southwest around 5 mph.
Sunday Night
Clear, with a low around 47. Calm wind becoming south around 5 mph after midnight.
Monday
Sunny, with a high near 79. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Monday Night
A 30 percent chance of rain and thunderstorms after midnight. Mostly clear, with a low around 59.
Tuesday
Rain likely and possibly a thunderstorm. Partly sunny, with a high near 80. Chance of precipitation is 70%.
Tuesday Night
Rain and possibly a thunderstorm. Low around 53. Chance of precipitation is 90%.
Wednesday
Rain and possibly a thunderstorm before noon, then a chance of rain. High near 66. Chance of precipitation is 90%.
Wednesday Night
Partly cloudy, with a low around 33.
Thursday
Sunny, with a high near 56.
Thursday Night
Mostly cloudy, with a low around 39.
Friday
Partly sunny, with a high near 67.
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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:
8:51 am CST Mar 7, 2026
Forecast Valid:
10am CST Mar 7, 2026-6pm CDT Mar 13, 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