NWS St. Louis Announces Changes To May 16, 2025 Tornado Damage Assessment
After a year-long review of new ground survey data and aerial imagery, NWS St. Louis made several adjustments to the May 16, 2025 tornado damage assessment. Read More >
Hazardous Weather Conditions
Current conditions at
St. Louis Downtown Airport (KCPS)
Lat: 38.56°NLon: 90.15°WElev: 410ft.
Fair
75°F
24°C
| Humidity | 71% |
| Wind Speed | S 8 mph |
| Barometer | 29.88 in (1011.2 mb) |
| Dewpoint | 65°F (18°C) |
| Visibility | 10.00 mi |
| Last update | 18 May 2:53 am CDT |
Extended Forecast for
Herculaneum MO
Overnight
Low: 75 °F
Mostly Cloudy
Monday
High: 87 °F
Showers
Likely then
ShowersMonday Night
Low: 68 °F
Chance
Showers then
Partly CloudyTuesday
High: 86 °F
Showers
Likely then
T-stormsTuesday Night
Low: 55 °F
Showers
Wednesday
High: 69 °F
Slight Chance
ShowersWednesday Night
Low: 50 °F
Mostly Cloudy
Thursday
High: 73 °F
Partly Sunny
Thursday Night
Low: 56 °F
Mostly Cloudy
then Chance
Showers
Detailed Forecast
Overnight
Mostly cloudy, with a steady temperature around 75. South wind around 9 mph, with gusts as high as 21 mph.
Monday
Showers and thunderstorms likely, then showers and possibly a thunderstorm after noon. High near 87. South wind 9 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 90%.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Partly cloudy, with a low around 68. South wind around 10 mph, with gusts as high as 23 mph.
Tuesday
Showers and thunderstorms likely, then showers and possibly a thunderstorm after noon. High near 86. Southwest wind 7 to 9 mph, with gusts as high as 21 mph. Chance of precipitation is 100%.
Tuesday Night
Showers and possibly a thunderstorm. Low around 55. Northwest wind around 6 mph. Chance of precipitation is 90%.
Wednesday
A 20 percent chance of showers before 1pm. Mostly cloudy, with a high near 69.
Wednesday Night
Mostly cloudy, with a low around 50.
Thursday
Partly sunny, with a high near 73.
Thursday Night
A 40 percent chance of showers after 1am. Mostly cloudy, with a low around 56.
Friday
Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 77. Chance of precipitation is 60%.
Friday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 58.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
Saturday Night
Partly cloudy, with a low around 59.
Sunday
Mostly sunny, with a high near 87.
Additional Forecasts and Information
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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)
2:01 am CDT May 18, 2026
3am CDT May 18, 2026-6pm CDT May 24, 2026
Additional Resources
Radar & Satellite Image
Hourly Weather Forecast
