Southwest City, MO Weather & Growing Conditions
Today
97°F
Sunny
Sunny, with a high near 97. Heat index values as high as 100. South wind 3 to 8 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 97°F | Sunny | 3 to 8 mph S | 0% |
| Tonight | 75°F | Mostly Clear | 2 to 7 mph SE | 1% |
| Wednesday | 98°F | Mostly Sunny | 6 to 9 mph S | 4% |
| Wednesday Night | 75°F | Slight Chance Showers And Thunderstorms | 6 mph S | 16% |
| Thursday | 97°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph SW | 20% |
| Thursday Night | 73°F | Chance Showers And Thunderstorms | 2 to 6 mph S | 69% |
| Friday | 93°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 to 7 mph S | 69% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 3 to 7 mph S | 31% |
| Saturday | 95°F | Slight Chance Showers And Thunderstorms then Sunny | 3 to 7 mph S | 16% |
| Saturday Night | 73°F | Mostly Clear | 7 mph S | 9% |
| Sunday | 95°F | Sunny | 5 to 9 mph S | 3% |
| Sunday Night | 74°F | Mostly Clear | 8 mph S | 2% |
| Monday | 96°F | Sunny | 6 to 12 mph S | 1% |
| Monday Night | 75°F | Mostly Clear | 9 mph S | 1% |
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 Aug 4, 2026.