Southwest City, MO Weather & Growing Conditions
Tonight
72°F
Mostly Clear
Mostly clear. Low around 72, with temperatures rising to around 74 overnight. South wind 2 to 7 mph, with gusts as high as 18 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 72°F | Mostly Clear | 2 to 7 mph S | 4% |
| Sunday | 95°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 9 mph SW | 37% |
| Sunday Night | 67°F | Chance Showers And Thunderstorms | 2 to 8 mph NW | 47% |
| Monday | 85°F | Slight Chance Showers And Thunderstorms | 2 to 9 mph N | 31% |
| Monday Night | 61°F | Partly Cloudy | 5 to 9 mph N | 3% |
| Tuesday | 81°F | Mostly Sunny | 6 to 9 mph N | 4% |
| Tuesday Night | 56°F | Mostly Clear | 3 to 9 mph NE | 4% |
| Wednesday | 82°F | Sunny | 3 to 7 mph NE | 1% |
| Wednesday Night | 57°F | Mostly Clear | 6 mph NE | 1% |
| Thursday | 85°F | Mostly Sunny | 5 mph E | 5% |
| Thursday Night | 62°F | Partly Cloudy | 3 mph NE | 8% |
| Friday | 86°F | Slight Chance Rain Showers | 5 mph E | 16% |
| Friday Night | 63°F | Slight Chance Rain Showers then Mostly Cloudy | 5 mph NE | 15% |
| Saturday | 88°F | Partly Sunny | 5 mph E | 7% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Southwest City, MO
Last spring frost
Apr 15
First fall frost
Oct 26
Growing season
194 days
Hardiness zone
7a
Explore more for Southwest City, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, Anderson 3W, Mo (8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.