Southwest City, MO Weather & Growing Conditions
Today
98°F
Sunny
Sunny, with a high near 98. Heat index values as high as 99. Southwest wind around 13 mph, with gusts as high as 21 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 98°F | Sunny | 13 mph SW | 0% |
| Tonight | 72°F | Partly Cloudy | 5 to 10 mph S | 2% |
| Sunday | 94°F | Slight Chance Showers And Thunderstorms | 6 to 10 mph SW | 31% |
| Sunday Night | 67°F | Showers And Thunderstorms | 1 to 7 mph NE | 77% |
| Monday | 84°F | Chance Showers And Thunderstorms | 1 to 10 mph N | 77% |
| Monday Night | 61°F | Partly Cloudy | 5 to 12 mph N | 11% |
| Tuesday | 79°F | Partly Sunny | 9 mph NE | 8% |
| Tuesday Night | 56°F | Partly Cloudy | 3 to 10 mph NE | 4% |
| Wednesday | 81°F | Sunny | 7 mph NE | 4% |
| Wednesday Night | 57°F | Mostly Clear | 6 mph NE | 2% |
| Thursday | 83°F | Mostly Sunny | 5 mph E | 5% |
| Thursday Night | 61°F | Partly Cloudy | 5 mph E | 8% |
| Friday | 83°F | Slight Chance Rain Showers | 6 mph E | 15% |
| Friday Night | 61°F | Partly Cloudy | 6 mph E | 12% |
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 19, 2026.