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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.

Overnight
73°F
Mostly Clear
Mostly clear, with a low around 73. South wind around 3 mph.

7-day forecast for Weldon Spring

WhenTempForecastWindPrecip
Overnight 73°F Mostly Clear 3 mph S 3%
Saturday 96°F Partly Sunny 3 to 7 mph SW 5%
Saturday Night 72°F Partly Cloudy 5 mph SW 4%
Sunday 90°F Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms 2 to 6 mph W 40%
Sunday Night 66°F Showers And Thunderstorms Likely 7 mph N 70%
Monday 76°F Showers And Thunderstorms Likely 6 to 9 mph NE 70%
Monday Night 58°F Chance Showers And Thunderstorms 6 to 9 mph NE 34%
Tuesday 69°F Slight Chance Rain Showers then Mostly Cloudy 10 mph N 20%
Tuesday Night 53°F Mostly Cloudy 5 to 9 mph N 3%
Wednesday 72°F Mostly Sunny 7 mph N 1%
Wednesday Night 55°F Partly Cloudy 2 to 6 mph N 0%
Thursday 74°F Mostly Sunny 2 to 6 mph N 2%
Thursday Night 57°F Partly Cloudy 2 to 6 mph NE 4%
Friday 75°F Partly Sunny 2 to 6 mph NE 8%

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

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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 Sep 19, 2026.