Ballwin, MO Weather & Growing Conditions
Today
97°F
Partly Sunny
Partly sunny, with a high near 97. Southwest wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 97°F | Partly Sunny | 7 mph SW | 1% |
| Tonight | 73°F | Partly Cloudy | 5 mph SW | 4% |
| Sunday | 92°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph W | 36% |
| Sunday Night | 68°F | Showers And Thunderstorms Likely | 6 mph NE | 69% |
| Monday | 77°F | Showers And Thunderstorms Likely | 7 mph NE | 69% |
| Monday Night | 60°F | Chance Showers And Thunderstorms | 8 mph N | 46% |
| Tuesday | 70°F | Slight Chance Rain Showers then Partly Sunny | 9 mph N | 21% |
| Tuesday Night | 55°F | Mostly Cloudy | 5 to 8 mph N | 3% |
| Wednesday | 73°F | Mostly Sunny | 7 mph N | 1% |
| Wednesday Night | 56°F | Partly Cloudy | 2 to 6 mph N | 0% |
| Thursday | 75°F | Mostly Sunny | 6 mph N | 1% |
| Thursday Night | 59°F | Partly Cloudy | 5 mph NE | 4% |
| Friday | 76°F | Partly Sunny | 6 mph NE | 8% |
| Friday Night | 59°F | Partly Cloudy | 5 mph NE | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Ballwin, MO
Last spring frost
Apr 4
First fall frost
Oct 29
Growing season
206 days
Hardiness zone
7a
Explore more for Ballwin, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, St Charles 7 Ssw, Mo (5.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.