Herculaneum, MO Weather & Growing Conditions
Overnight
51°F
Chance Light Rain
A chance of rain before 2am, then a slight chance of drizzle between 2am and 4am. Mostly cloudy, with a low around 51. Southwest wind around 7 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Chance Light Rain | 7 mph SW | 28% |
| Wednesday | 64°F | Mostly Cloudy | 6 to 9 mph W | 4% |
| Wednesday Night | 40°F | Mostly Clear | 3 mph W | 0% |
| Thursday | 66°F | Sunny | 3 to 7 mph W | 2% |
| Thursday Night | 40°F | Mostly Cloudy | 3 mph NW | 12% |
| Friday | 59°F | Partly Sunny | 3 to 8 mph NW | 4% |
| Friday Night | 36°F | Mostly Cloudy | 1 to 5 mph N | 2% |
| Saturday | 57°F | Partly Sunny | 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). Updated through the day.
Growing snapshot for Herculaneum, MO
Last spring frost
Apr 9
First fall frost
Oct 26
Growing season
197 days
Hardiness zone
7a
Explore more for Herculaneum, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, Festus, Mo (2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.