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Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Fair
43°F
6°C
| Humidity | 74% |
| Wind Speed | NW 20 mph |
| Barometer | 29.77 in (1008.2 mb) |
| Dewpoint | 35°F (2°C) |
| Visibility | 10.00 mi |
| Wind Chill | 34°F (1°C) |
| Last update | 14 Jan 5:53 am CST |
Extended Forecast for
Herculaneum MO
Today

High: 41 °F⇓
Gradual
ClearingTonight

Low: 18 °F
Clear
Thursday

High: 36 °F
Sunny
Thursday Night
Low: 26 °F
Slight Chance
Snow then
Partly CloudyFriday

High: 46 °F
Partly Sunny
Friday Night

Low: 19 °F
Mostly Cloudy
Saturday

High: 30 °F
Mostly Sunny
Saturday Night

Low: 9 °F
Partly Cloudy
Sunday

High: 28 °F
Mostly Sunny
Detailed Forecast
Today
Cloudy through mid morning, then gradual clearing, with a temperature falling to around 31 by 5pm. Northwest wind 11 to 18 mph, with gusts as high as 36 mph.
Tonight
Clear, with a low around 18. Northwest wind 6 to 13 mph, with gusts as high as 26 mph.
Thursday
Sunny, with a high near 36. Northwest wind around 5 mph becoming light and variable in the afternoon.
Thursday Night
A 20 percent chance of snow before midnight. Mostly cloudy, with a low around 26. Light and variable wind becoming southwest 5 to 7 mph in the evening.
Friday
Partly sunny, with a high near 46. West wind 7 to 13 mph, with gusts as high as 26 mph.
Friday Night
Mostly cloudy, with a low around 19.
Saturday
Mostly sunny, with a high near 30.
Saturday Night
Partly cloudy, with a low around 9.
Sunday
Mostly sunny, with a high near 28.
Sunday Night
Partly cloudy, with a low around 15.
M.L.King Day
Mostly sunny, with a high near 34.
Monday Night
Mostly clear, with a low around 12.
Tuesday
Sunny, with a high near 38.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Herculaneum MO
38.25°N 90.39°W (Elev. 499 ft)
38.25°N 90.39°W (Elev. 499 ft)
4:21 am CST Jan 14, 2026
6am CST Jan 14, 2026-6pm CST Jan 20, 2026


