Herculaneum, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Herculaneum, a city in Jefferson County, Missouri.
Tonight
50°F
Light Rain
Rain and a slight chance of thunderstorms before 3am, then a chance of rain showers between 3am and 4am. Cloudy, with a low around 50. Southwest wind 5 to 12 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
7-day forecast for Herculaneum
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Light Rain | 5 to 12 mph SW | 87% |
| Wednesday | 64°F | Mostly Cloudy | 5 to 9 mph W | 3% |
| Wednesday Night | 39°F | Partly Cloudy | 3 mph SW | 0% |
| Thursday | 67°F | Sunny | 3 to 7 mph W | 2% |
| Thursday Night | 40°F | Mostly Cloudy | 3 mph NW | 11% |
| Friday | 58°F | Partly Sunny | 3 to 8 mph NW | 4% |
| Friday Night | 36°F | Mostly Cloudy | 0 to 5 mph N | 2% |
| Saturday | 57°F | Partly Sunny | 0 to 3 mph NW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 63°F | Sunny | 1 to 6 mph W | 7% |
| Sunday Night | 32°F | Mostly Clear | 3 mph W | 6% |
| Monday | 67°F | Sunny | 1 to 6 mph SW | 2% |
| Monday Night | 37°F | Mostly Clear | 3 mph SW | 1% |
| Tuesday | 70°F | Sunny | 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Herculaneum (38.258, -90.393). Updated through the day.
Growing snapshot for Herculaneum
Last spring frost
Apr 9
First fall frost
Oct 26
Growing season
197 days
Hardiness zone
7a
More local growing data for Herculaneum: nearby ZIP 63048 weather · frost dates · planting calendar · Missouri frost dates
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Raintree Plantation
Scotsdale
Summer Set
Climate data from the nearest NOAA station, Festus, Mo (2 mi from Herculaneum). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.