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.
This Afternoon
74°F
Light Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 74, with temperatures falling to around 67 in the afternoon. South wind around 16 mph, with gusts as high as 26 mph. Chance of precipitation is 90%.
7-day forecast for Weldon Spring
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Light Rain | 16 mph S | 91% |
| Tonight | 52°F | Light Rain | 7 to 14 mph S | 75% |
| Wednesday | 62°F | Mostly Cloudy | 7 to 14 mph W | 3% |
| Wednesday Night | 41°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 64°F | Sunny | 6 to 10 mph W | 3% |
| Thursday Night | 41°F | Mostly Cloudy | 6 mph NW | 9% |
| Friday | 57°F | Mostly Cloudy | 6 to 9 mph NW | 4% |
| Friday Night | 37°F | Mostly Cloudy | 1 to 5 mph N | 1% |
| Saturday | 56°F | Partly Sunny | 3 mph NW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 2 mph W | 2% |
| Sunday | 61°F | Sunny | 2 to 6 mph W | 9% |
| Sunday Night | 35°F | Mostly Clear | 3 mph W | 4% |
| Monday | 66°F | Sunny | 2 to 6 mph SW | 2% |
| Monday Night | 40°F | Mostly Clear | 3 mph SW | 1% |
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 Nov 4, 2026.