Cottleville, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cottleville, a city in St. Charles County, Missouri.
Overnight
74°F
Mostly Clear
Mostly clear, with a low around 74. South wind around 5 mph.
7-day forecast for Cottleville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 74°F | Mostly Clear | 5 mph S | 4% |
| Saturday | 96°F | Partly Sunny | 7 mph SW | 5% |
| Saturday Night | 73°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 | 41% |
| 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 | 32% |
| Tuesday | 69°F | Slight Chance Rain Showers then Mostly Cloudy | 10 mph N | 20% |
| Tuesday Night | 54°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 | 75°F | Mostly Sunny | 6 mph N | 2% |
| Thursday Night | 57°F | Mostly Cloudy | 5 mph NE | 4% |
| Friday | 76°F | Partly Sunny | 2 to 6 mph NE | 8% |
Forecast source: National Weather Service (api.weather.gov) for Cottleville (38.752, -90.658). Updated through the day.
Growing snapshot for Cottleville
Last spring frost
Apr 10
First fall frost
Oct 26
Growing season
199 days
Hardiness zone
6b
More local growing data for Cottleville: nearby ZIP 63304 weather · frost dates · planting calendar · Missouri frost dates
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Weldon Spring
Weldon Spring Heights
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West Alton
Climate data from the nearest NOAA station, Weldon Spring Nws, Mo (0.5 mi from Cottleville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.