St. Ann, MO Weather & Growing Conditions
This Afternoon
58°F
Mostly Cloudy
Mostly cloudy, with a high near 58. West wind 8 to 12 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 58°F | Mostly Cloudy | 8 to 12 mph W | 0% |
| Tonight | 47°F | Partly Cloudy | 5 to 8 mph W | 0% |
| Thursday | 62°F | Mostly Sunny | 7 to 12 mph W | 9% |
| Thursday Night | 46°F | Isolated Rain Showers then Mostly Cloudy | 5 to 8 mph NW | 16% |
| Friday | 55°F | Partly Sunny | 10 mph N | 5% |
| Friday Night | 37°F | Mostly Clear | 2 to 7 mph N | 0% |
| Saturday | 54°F | Mostly Sunny | 3 mph N | 0% |
| Saturday Night | 36°F | Mostly Clear | 2 mph NW | 0% |
| Sunday | 59°F | Sunny | 5 mph W | 0% |
| Sunday Night | 39°F | Mostly Clear | 2 mph W | 0% |
| Monday | 65°F | Sunny | 5 mph SW | 0% |
| Monday Night | 44°F | Clear | 5 mph SW | 1% |
| Tuesday | 66°F | Sunny | 3 mph W | 3% |
| Tuesday Night | 45°F | Mostly Clear | 2 mph NW | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Ann, MO
Last spring frost
Apr 2
First fall frost
Nov 4
Growing season
215 days
Hardiness zone
7a
Explore more for St. Ann, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, St Louis Lambert Intl Ap, Mo (2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.