Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Fair
25°F
-4°C
| Humidity | 42% |
| Wind Speed | Vrbl 7 mph |
| Barometer | 30.29 in (1026.3 mb) |
| Dewpoint | 5°F (-15°C) |
| Visibility | 10.00 mi |
| Wind Chill | 17°F (-8°C) |
| Last update | 17 Mar 11:53 am CDT |
Extended Forecast for
Herculaneum MO
This Afternoon
High: 38 °F
Increasing
CloudsTonight
Low: 31 °F
Chance Snow
Wednesday
High: 66 °F
Becoming
SunnyWednesday Night
Low: 45 °F
Mostly Cloudy
Thursday
High: 75 °F
Mostly Sunny
Thursday Night
Low: 45 °F
Mostly Clear
Friday
High: 77 °F
Sunny
Friday Night
Low: 48 °F
Mostly Clear
Saturday
High: 80 °F
Sunny
Detailed Forecast
This Afternoon
Increasing clouds, with a high near 38. Southwest wind 3 to 5 mph.
Tonight
A 30 percent chance of snow, mainly before 11pm. Cloudy, with a low around 31. Southeast wind 5 to 9 mph, with gusts as high as 23 mph.
Wednesday
Mostly cloudy through mid morning, then gradual clearing, with a high near 66. South wind 7 to 9 mph becoming west in the afternoon. Winds could gust as high as 20 mph.
Wednesday Night
Mostly cloudy, with a low around 45. Light and variable wind.
Thursday
Mostly sunny, with a high near 75. Calm wind becoming southwest around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 45.
Friday
Sunny, with a high near 77.
Friday Night
Mostly clear, with a low around 48.
Saturday
Sunny, with a high near 80.
Saturday Night
Clear, with a low around 53.
Sunday
Sunny, with a high near 77.
Sunday Night
Partly cloudy, with a low around 41.
Monday
Partly sunny, with a high near 59.
Additional Forecasts and Information
Basemap Options
Click map to change the forecast location
Loading map...
Forecast AreaABOUT THIS FORECAST
Point Forecast:
Herculaneum MO
38.25°N 90.39°W (Elev. 499 ft)
38.25°N 90.39°W (Elev. 499 ft)
11:36 am CDT Mar 17, 2026
12pm CDT Mar 17, 2026-6pm CDT Mar 23, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
