Herculaneum, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Herculaneum, a city in Jefferson County, Missouri.
Tonight
70°F
Partly Cloudy
Partly cloudy, with a low around 70. Southeast wind around 3 mph.
7-day forecast for Herculaneum
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Partly Cloudy | 3 mph SE | 13% |
| Saturday | 99°F | Mostly Sunny | 2 to 6 mph SW | 5% |
| Saturday Night | 71°F | Partly Cloudy | 3 mph SW | 0% |
| Sunday | 95°F | Mostly Sunny | 5 mph W | 13% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 3 mph N | 53% |
| Monday | 82°F | Showers And Thunderstorms Likely | 2 to 7 mph N | 65% |
| Monday Night | 59°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 3 to 7 mph N | 65% |
| Tuesday | 73°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 8 mph N | 19% |
| Tuesday Night | 53°F | Mostly Cloudy | 2 to 8 mph N | 7% |
| Wednesday | 75°F | Mostly Sunny | 6 mph N | 2% |
| Wednesday Night | 53°F | Partly Cloudy | 1 to 5 mph N | 2% |
| Thursday | 76°F | Mostly Sunny | 1 to 6 mph N | 3% |
| Thursday Night | 55°F | Partly Cloudy | 1 to 5 mph N | 3% |
| Friday | 77°F | Mostly Sunny | 1 to 6 mph N | 6% |
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
Nearby towns & communities
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Festus
High Ridge
Hillsboro
Horine
Imperial
Kimmswick
Murphy
Olympian Village
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Peaceful Village
Pevely
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 Sep 19, 2026.