Marthasville, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Marthasville, a city in Warren County, Missouri.
Today
90°F
Patchy Fog then Sunny
Patchy fog before 8am. Sunny, with a high near 90. South wind around 1 mph.
7-day forecast for Marthasville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 90°F | Patchy Fog then Sunny | 1 mph S | 0% |
| Tonight | 68°F | Mostly Clear | 1 mph SE | 0% |
| Wednesday | 91°F | Sunny then Isolated Showers And Thunderstorms | 1 mph S | 19% |
| Wednesday Night | 70°F | Chance Showers And Thunderstorms | 2 mph S | 68% |
| Thursday | 87°F | Showers And Thunderstorms Likely | 1 mph S | 69% |
| Thursday Night | 68°F | Partly Cloudy then Chance Showers And Thunderstorms | 0 mph | 27% |
| Friday | 88°F | Chance Showers And Thunderstorms | 0 mph | 27% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 0 mph | 29% |
| Saturday | 90°F | Chance Showers And Thunderstorms then Sunny | 0 mph | 29% |
| Saturday Night | 71°F | Mostly Clear | 1 mph SW | 6% |
| Sunday | 93°F | Sunny | 3 mph SW | 3% |
| Sunday Night | 73°F | Mostly Clear | 2 mph S | 5% |
| Monday | 94°F | Sunny | 5 mph SW | 4% |
| Monday Night | 74°F | Mostly Clear | 3 mph S | 11% |
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 Aug 4, 2026.