Hazardous Weather Conditions
Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Partly Cloudy
90°F
32°C
| Humidity | 54% |
| Wind Speed | Calm |
| Barometer | 29.97 in (1014.4 mb) |
| Dewpoint | 71°F (22°C) |
| Visibility | 10.00 mi |
| Heat Index | 96°F (36°C) |
| Last update | 14 Aug 2:53 pm CDT |
Extended Forecast for
Herculaneum MO
Heat Advisory August 15, 12:00pm until August 18, 08:00pm
Tonight
Low: 69 °F
Mostly Clear
Friday
High: 94 °F
Patchy Fog
then Mostly
SunnyFriday Night
Low: 72 °F
Mostly Clear
Saturday
High: 97 °F
Hot
Saturday Night
Low: 73 °F
Mostly Clear
Sunday
High: 97 °F
Hot
Sunday Night
Low: 74 °F
Mostly Clear
Monday
High: 98 °F
Hot
Monday Night
Low: 74 °F
Mostly Clear
Detailed Forecast
Tonight
Mostly clear, with a low around 69. Light east wind.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 94. Heat index values as high as 101. Calm wind becoming south around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 72. Calm wind.
Saturday
Sunny and hot, with a high near 97. Heat index values as high as 109. Calm wind.
Saturday Night
Mostly clear, with a low around 73. Calm wind.
Sunday
Sunny and hot, with a high near 97.
Sunday Night
Mostly clear, with a low around 74.
Monday
Sunny and hot, with a high near 98.
Monday Night
Mostly clear, with a low around 74.
Tuesday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 97.
Tuesday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Wednesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Thursday
A 20 percent chance of showers. Mostly sunny, with a high near 89.
Additional Forecasts and Information
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Point Forecast:
Herculaneum MO
38.27°N 90.39°W (Elev. 456 ft)
38.27°N 90.39°W (Elev. 456 ft)
4:16 pm CDT Aug 14, 2025
4pm CDT Aug 14, 2025-6pm CDT Aug 21, 2025
Additional Resources
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