Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Fair
39°F
4°C
| Humidity | 67% |
| Wind Speed | NE 7 mph |
| Barometer | 30.09 in (1019.0 mb) |
| Dewpoint | 29°F (-2°C) |
| Visibility | 10.00 mi |
| Wind Chill | 34°F (1°C) |
| Last update | 14 Mar 3:53 am CDT |
Extended Forecast for
Herculaneum MO
Today
High: 66 °F
Mostly Sunny
Tonight
Low: 53 °F
Partly Cloudy
Sunday
High: 68 °F
Slight Chance
Rain then
RainSunday Night
Low: 19 °F
Rain/Snow
Monday
High: 29 °F
Slight Chance
SnowMonday Night
Low: 12 °F
Mostly Clear
Tuesday
High: 39 °F
Sunny
Tuesday Night
Low: 28 °F
Slight Chance
Snow then
Slight Chance
Rain/SnowWednesday
High: 65 °F
Partly Sunny
Detailed Forecast
Today
Mostly sunny, with a high near 66. Light and variable wind becoming southeast 5 to 9 mph in the morning. Winds could gust as high as 20 mph.
Tonight
Partly cloudy, with a low around 53. South wind 6 to 10 mph, with gusts as high as 24 mph.
Sunday
Rain, with thunderstorms also possible after 4pm. High near 68. South wind 14 to 17 mph, with gusts as high as 36 mph. Chance of precipitation is 90%.
Sunday Night
Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 19. Southwest wind 15 to 18 mph becoming northwest after midnight. Winds could gust as high as 38 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Monday
A 20 percent chance of snow before 1pm. Mostly cloudy, with a high near 29. Northwest wind 15 to 17 mph, with gusts as high as 37 mph.
Monday Night
Mostly clear, with a low around 12.
Tuesday
Sunny, with a high near 39.
Tuesday Night
A slight chance of snow before 1am, then a slight chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 20%.
Wednesday
Partly sunny, with a high near 65.
Wednesday Night
Mostly clear, with a low around 39.
Thursday
Sunny, with a high near 74.
Thursday Night
Partly cloudy, with a low around 46.
Friday
Sunny, with a high near 73.
Additional Forecasts and Information
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Herculaneum MO
38.27°N 90.39°W (Elev. 456 ft)
38.27°N 90.39°W (Elev. 456 ft)
4:41 am CDT Mar 14, 2026
4am CDT Mar 14, 2026-6pm CDT Mar 20, 2026
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