New Melle, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Melle, a city in St. Charles County, Missouri.
This Afternoon
98°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Sunny, with a high near 98. Heat index values as high as 104. South wind around 2 mph. Chance of precipitation is 30%.
7-day forecast for New Melle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 98°F | Chance Showers And Thunderstorms | 2 mph S | 26% |
| Tonight | 73°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 3 mph SE | 21% |
| Saturday | 97°F | Partly Sunny | 3 to 7 mph SW | 5% |
| Saturday Night | 72°F | Mostly Cloudy | 3 mph SW | 6% |
| Sunday | 91°F | Chance Rain Showers then Chance Showers And Thunderstorms | 5 mph W | 30% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 6 mph N | 67% |
| Monday | 77°F | Showers And Thunderstorms Likely | 5 to 8 mph N | 68% |
| Monday Night | 59°F | Showers And Thunderstorms Likely | 8 mph N | 63% |
| Tuesday | 70°F | Slight Chance Rain Showers then Mostly Cloudy | 8 mph N | 23% |
| Tuesday Night | 53°F | Mostly Cloudy | 3 to 7 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 | 57°F | Partly Cloudy | 3 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov) for New Melle (38.719, -90.882). Updated through the day.
Growing snapshot for New Melle
Last spring frost
Apr 10
First fall frost
Oct 26
Growing season
199 days
Hardiness zone
6b
More local growing data for New Melle: nearby ZIP 63365 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Augusta
Cottleville
Dardenne Prairie
Defiance
Flint Hill
Foristell
Josephville
Lake St. Louis
O'Fallon
St. Paul
St. Peters
Weldon Spring
Weldon Spring Heights
Wentzville
West Alton
Climate data from the nearest NOAA station, Weldon Spring Nws, Mo (10.3 mi from New Melle). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.