Wentzville, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Wentzville, a city in St. Charles County, Missouri.
Tonight
73°F
Partly Cloudy
Partly cloudy, with a low around 73. Southeast wind 2 to 6 mph.
7-day forecast for Wentzville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 73°F | Partly Cloudy | 2 to 6 mph SE | 13% |
| Saturday | 97°F | Partly Sunny | 3 to 7 mph SW | 5% |
| Saturday Night | 72°F | Mostly Cloudy | 3 mph SW | 7% |
| Sunday | 91°F | Chance Rain Showers then Chance Showers And Thunderstorms | 5 mph W | 33% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 6 mph N | 68% |
| Monday | 77°F | Showers And Thunderstorms Likely | 5 to 9 mph N | 68% |
| Monday Night | 58°F | Showers And Thunderstorms Likely | 6 to 9 mph N | 59% |
| Tuesday | 70°F | Slight Chance Rain Showers then Mostly Cloudy | 9 mph N | 23% |
| Tuesday Night | 53°F | Mostly Cloudy | 3 to 8 mph N | 6% |
| Wednesday | 73°F | Mostly Sunny | 6 mph N | 0% |
| Wednesday Night | 54°F | Partly Cloudy | 1 to 5 mph N | 1% |
| Thursday | 75°F | Mostly Sunny | 5 mph N | 3% |
| Thursday Night | 56°F | Partly Cloudy | 3 mph NE | 3% |
| Friday | 75°F | Mostly Sunny | 5 mph NE | 8% |
Forecast source: National Weather Service (api.weather.gov) for Wentzville (38.816, -90.871). Updated through the day.
Growing snapshot for Wentzville
Last spring frost
Apr 10
First fall frost
Oct 26
Growing season
199 days
Hardiness zone
6b
More local growing data for Wentzville: nearby ZIP 63385 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Augusta
Cottleville
Dardenne Prairie
Defiance
Flint Hill
Foristell
Josephville
Lake St. Louis
New Melle
O'Fallon
St. Paul
St. Peters
Weldon Spring
Weldon Spring Heights
West Alton
Climate data from the nearest NOAA station, Weldon Spring Nws, Mo (11.6 mi from Wentzville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.