Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Mostly Cloudy
80°F
27°C
| Humidity | 74% |
| Wind Speed | SW 6 mph |
| Barometer | 29.94 in (1013.4 mb) |
| Dewpoint | 71°F (22°C) |
| Visibility | 10.00 mi |
| Heat Index | 83°F (28°C) |
| Last update | 14 Oct 12:53 am CDT |
Extended Forecast for
Herculaneum MO
Overnight
Low: 71 °F
T-storms
LikelyWednesday
High: 80 °F
T-storms then
Showers
LikelyWednesday Night
Low: 65 °F
Chance
T-stormsThursday
High: 86 °F
Showers
LikelyThursday Night
Low: 47 °F
Showers
LikelyFriday
High: 61 °F
Mostly Sunny
Friday Night
Low: 35 °F
Mostly Clear
Saturday
High: 63 °F
Sunny
Saturday Night
Low: 36 °F
Clear
Detailed Forecast
Overnight
Showers and thunderstorms likely, mainly after 5am. Increasing clouds, with a low around 71. South wind around 5 mph becoming light and variable. Chance of precipitation is 60%.
Wednesday
Showers and thunderstorms before 11am, then showers likely and possibly a thunderstorm between 11am and 1pm, then a chance of showers and thunderstorms after 1pm. High near 80. Northwest wind around 5 mph becoming light and variable. Chance of precipitation is 90%.
Wednesday Night
A 40 percent chance of showers and thunderstorms, mainly after midnight. Cloudy, then gradually becoming partly cloudy, with a low around 65. Calm wind becoming northeast around 5 mph.
Thursday
Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms between 10am and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, then gradually becoming sunny, with a high near 86. East wind 5 to 8 mph becoming southwest in the afternoon. Chance of precipitation is 70%.
Thursday Night
Showers likely and possibly a thunderstorm before 7pm, then a chance of showers and thunderstorms between 7pm and 1am, then a chance of showers after 1am. Mostly cloudy, with a low around 47. West wind 7 to 13 mph becoming northwest after midnight. Winds could gust as high as 24 mph. Chance of precipitation is 60%.
Friday
Mostly sunny, with a high near 61.
Friday Night
Mostly clear, with a low around 35.
Saturday
Sunny, with a high near 63.
Saturday Night
Clear, with a low around 36.
Sunday
Sunny, with a high near 72.
Sunday Night
Partly cloudy, with a low around 43.
Monday
Mostly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 47.
Tuesday
Mostly sunny, with a high near 80.
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)
11:11 pm CDT Oct 13, 2026
12am CDT Oct 14, 2026-6pm CDT Oct 20, 2026
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