Weldon Spring, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Weldon Spring, a city in St. Charles County, Missouri.
Today
89°F
Sunny
Sunny, with a high near 89. South wind around 5 mph.
7-day forecast for Weldon Spring
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Sunny | 5 mph S | 0% |
| Tonight | 69°F | Mostly Clear | 5 mph S | 0% |
| Wednesday | 90°F | Sunny | 5 mph S | 14% |
| Wednesday Night | 71°F | Chance Showers And Thunderstorms | 6 mph S | 69% |
| Thursday | 86°F | Showers And Thunderstorms Likely | 5 mph S | 69% |
| Thursday Night | 69°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 2 mph SE | 24% |
| Friday | 87°F | Slight Chance Showers And Thunderstorms then Partly Sunny | 2 mph SW | 24% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 2 mph S | 27% |
| Saturday | 89°F | Chance Showers And Thunderstorms then Mostly Sunny | 3 mph SW | 27% |
| Saturday Night | 72°F | Mostly Clear | 5 mph S | 6% |
| Sunday | 91°F | Sunny | 7 mph SW | 4% |
| Sunday Night | 74°F | Mostly Clear | 6 mph S | 4% |
| Monday | 93°F | Sunny | 7 mph SW | 4% |
| Monday Night | 75°F | Slight Chance Showers And Thunderstorms | 7 mph SW | 16% |
Forecast source: National Weather Service (api.weather.gov) for Weldon Spring (38.709, -90.653). Updated through the day.
Growing snapshot for Weldon Spring
Last spring frost
Apr 10
First fall frost
Oct 26
Growing season
199 days
Hardiness zone
6b
More local growing data for Weldon Spring: nearby ZIP 63304 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 Heights
Wentzville
West Alton
Climate data from the nearest NOAA station, Weldon Spring Nws, Mo (0.5 mi from Weldon Spring). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.