Marthasville, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marthasville, a city in Warren County, Missouri.
Overnight
71°F
Mostly Clear
Mostly clear, with a low around 71. South wind around 3 mph.
7-day forecast for Marthasville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 71°F | Mostly Clear | 3 mph S | 4% |
| Saturday | 96°F | Partly Sunny | 0 to 3 mph SW | 3% |
| Saturday Night | 69°F | Partly Cloudy | 1 mph W | 4% |
| Sunday | 90°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 2 mph NW | 42% |
| Sunday Night | 64°F | Showers And Thunderstorms Likely | 3 mph N | 72% |
| Monday | 76°F | Showers And Thunderstorms Likely | 1 to 6 mph NE | 72% |
| Monday Night | 57°F | Chance Showers And Thunderstorms | 2 to 6 mph NE | 32% |
| Tuesday | 69°F | Slight Chance Rain Showers then Partly Sunny | 6 mph N | 18% |
| Tuesday Night | 51°F | Mostly Cloudy | 1 to 5 mph N | 2% |
| Wednesday | 72°F | Mostly Sunny | 3 mph N | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 2 mph N | 0% |
| Thursday | 75°F | Mostly Sunny | 2 mph N | 2% |
| Thursday Night | 55°F | Mostly Cloudy | 1 mph N | 5% |
| Friday | 75°F | Mostly Sunny | 2 mph NE | 10% |
Forecast source: National Weather Service (api.weather.gov) for Marthasville (38.631, -91.058). Updated through the day.
Growing snapshot for Marthasville
Last spring frost
Apr 8
First fall frost
Oct 25
Growing season
199 days
Hardiness zone
6b
More local growing data for Marthasville: nearby ZIP 63357 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Washington, Mo (10.1 mi from Marthasville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.