Harman US

Herculaneum, MO Weather & Growing Conditions

This Afternoon
99°F
Mostly Sunny
Mostly sunny, with a high near 99. Heat index values as high as 103. Southwest wind around 5 mph.

7-day forecast

WhenTempForecastWindPrecip
This Afternoon 99°F Mostly Sunny 5 mph SW 1%
Tonight 71°F Partly Cloudy 3 mph SW 2%
Sunday 94°F Partly Sunny 5 mph W 3%
Sunday Night 65°F Chance Showers And Thunderstorms then Showers And Thunderstorms Likely 5 mph NE 62%
Monday 82°F Showers And Thunderstorms Likely 2 to 6 mph NE 59%
Monday Night 59°F Showers And Thunderstorms Likely 3 to 7 mph NE 59%
Tuesday 73°F Slight Chance Rain Showers then Mostly Cloudy 5 to 8 mph N 23%
Tuesday Night 53°F Mostly Cloudy 2 to 8 mph N 1%
Wednesday 74°F Mostly Sunny 3 to 7 mph N 0%
Wednesday Night 53°F Partly Cloudy 0 to 6 mph N 0%
Thursday 76°F Mostly Sunny 0 to 5 mph N 2%
Thursday Night 56°F Mostly Cloudy 0 to 3 mph NE 5%
Friday 79°F Slight Chance Rain Showers 1 to 5 mph NE 18%
Friday Night 56°F Slight Chance Rain Showers then Mostly Cloudy 3 mph NE 18%

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 Sep 20, 2026.