St. Ann, MO Weather & Growing Conditions
This Afternoon
98°F
Partly Sunny
Partly sunny, with a high near 98. Heat index values as high as 101. West wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 98°F | Partly Sunny | 7 mph W | 1% |
| Tonight | 76°F | Partly Cloudy | 6 mph SW | 1% |
| Sunday | 93°F | Partly Sunny then Chance Showers And Thunderstorms | 3 to 7 mph W | 26% |
| Sunday Night | 69°F | Showers And Thunderstorms Likely | 6 to 9 mph NE | 72% |
| Monday | 80°F | Showers And Thunderstorms Likely | 9 mph NE | 72% |
| Monday Night | 62°F | Chance Showers And Thunderstorms | 6 to 9 mph NE | 52% |
| Tuesday | 72°F | Slight Chance Rain Showers then Mostly Cloudy | 12 mph N | 22% |
| Tuesday Night | 57°F | Mostly Cloudy | 6 to 12 mph N | 1% |
| Wednesday | 74°F | Mostly Sunny | 9 mph N | 0% |
| Wednesday Night | 57°F | Partly Cloudy | 3 to 8 mph N | 0% |
| Thursday | 76°F | Mostly Sunny | 6 mph N | 1% |
| Thursday Night | 61°F | Mostly Cloudy then Slight Chance Rain Showers | 6 mph NE | 15% |
| Friday | 79°F | Slight Chance Rain Showers | 3 to 7 mph NE | 19% |
| Friday Night | 62°F | Slight Chance Rain Showers then Mostly Cloudy | 6 mph NE | 19% |
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 Sep 19, 2026.