Ballwin, MO Weather & Growing Conditions
Tonight
53°F
Rain
Rain and a slight chance of thunderstorms before 3am, then a chance of rain showers between 3am and 4am. Cloudy, with a low around 53. South wind 7 to 12 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 53°F | Rain | 7 to 12 mph S | 82% |
| Wednesday | 63°F | Mostly Cloudy | 6 to 12 mph W | 3% |
| Wednesday Night | 44°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 66°F | Sunny | 5 to 9 mph W | 2% |
| Thursday Night | 44°F | Mostly Cloudy | 6 mph NW | 10% |
| Friday | 58°F | Mostly Cloudy | 8 mph NW | 5% |
| Friday Night | 40°F | Mostly Cloudy | 5 mph N | 2% |
| Saturday | 56°F | Partly Sunny | 3 mph NW | 0% |
| Saturday Night | 37°F | Partly Cloudy | 2 mph W | 1% |
| Sunday | 62°F | Sunny | 2 to 6 mph W | 9% |
| Sunday Night | 37°F | Mostly Clear | 3 mph W | 4% |
| Monday | 67°F | Sunny | 2 to 6 mph SW | 2% |
| Monday Night | 42°F | Mostly Clear | 5 mph SW | 1% |
| Tuesday | 69°F | Sunny | 5 mph W | 1% |
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 Nov 4, 2026.