St. Ann, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Ann, a city in St. Louis County, Missouri.
Overnight
68°F
Clear
Clear, with a low around 68. Southeast wind around 6 mph.
7-day forecast for St. Ann
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 68°F | Clear | 6 mph SE | 0% |
| Tuesday | 90°F | Sunny | 5 mph S | 0% |
| Tuesday Night | 71°F | Mostly Clear | 6 mph SE | 0% |
| Wednesday | 91°F | Sunny | 6 mph S | 11% |
| Wednesday Night | 73°F | Chance Showers And Thunderstorms | 7 mph S | 69% |
| Thursday | 87°F | Showers And Thunderstorms Likely | 6 mph S | 69% |
| Thursday Night | 72°F | Chance Showers And Thunderstorms | 5 mph SE | 27% |
| Friday | 88°F | Chance Showers And Thunderstorms | 5 mph SW | 27% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 5 mph S | 27% |
| Saturday | 90°F | Chance Showers And Thunderstorms then Mostly Sunny | 5 mph SW | 27% |
| Saturday Night | 75°F | Mostly Clear | 7 mph S | 6% |
| Sunday | 93°F | Sunny | 8 mph SW | 5% |
| Sunday Night | 76°F | Mostly Clear | 8 mph S | 5% |
| Monday | 94°F | Mostly Sunny | 8 mph SW | 5% |
Forecast source: National Weather Service (api.weather.gov) for St. Ann (38.727, -90.387). Updated through the day.
Growing snapshot for St. Ann
Last spring frost
Apr 2
First fall frost
Nov 4
Growing season
215 days
Hardiness zone
7a
More local growing data for St. Ann: nearby ZIP 63074 weather · frost dates · planting calendar · Missouri frost dates
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Clarkson Valley
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Edmundson
Climate data from the nearest NOAA station, St Louis Lambert Intl Ap, Mo (2 mi from St. Ann). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.