National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

NWS St. Louis Announces Changes To May 16, 2025 Tornado Damage Assessment

After a year-long review of new ground survey data and aerial imagery, NWS St. Louis made several adjustments to the May 16, 2025 tornado damage assessment. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Light Rain

77°F

25°C

Humidity 88%
Wind Speed Calm
Barometer 29.93 in (1013.1 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 30 May 5:53 pm CDT
Extended Forecast for

Herculaneum MO

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 63. Light east wind.

    Low: 63 °F

    Slight Chance
    T-storms then
    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers, then a chance of showers and thunderstorms after 11am. Partly sunny, with a high near 83. Light and variable wind. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Showers and thunderstorms likely, mainly after 5am. Partly cloudy, with a low around 63. Light south wind. Chance of precipitation is 60%.

    Low: 63 °F

    Slight Chance
    T-storms then
    T-storms
    Likely

  • Monday

    Monday: Showers and thunderstorms likely, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 85. Light and variable wind. Chance of precipitation is 60%.

    High: 85 °F

    T-storms
    Likely then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 20 percent chance of showers and thunderstorms before 10pm. Mostly clear, with a low around 61. Northeast wind around 5 mph becoming calm in the evening.

    Low: 61 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 63. Light east wind.
Sunday
A slight chance of showers, then a chance of showers and thunderstorms after 11am. Partly sunny, with a high near 83. Light and variable wind. Chance of precipitation is 30%.
Sunday Night
Showers and thunderstorms likely, mainly after 5am. Partly cloudy, with a low around 63. Light south wind. Chance of precipitation is 60%.
Monday
Showers and thunderstorms likely, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 85. Light and variable wind. Chance of precipitation is 60%.
Monday Night
A 20 percent chance of showers and thunderstorms before 10pm. Mostly clear, with a low around 61. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 56.
Wednesday
Sunny, with a high near 81.
Wednesday Night
Mostly clear, with a low around 56.
Thursday
Sunny, with a high near 85.
Thursday Night
Partly cloudy, with a low around 63.
Friday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Saturday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Herculaneum MO
 38.27°N 90.39°W (Elev. 456 ft)
Last Update:
5:41 pm CDT May 30, 2026
Forecast Valid:
7pm CDT May 30, 2026-6pm CDT Jun 6, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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