Affton, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Affton, a community in St. Louis County, Missouri.
This Afternoon
59°F
Mostly Cloudy
Mostly cloudy, with a high near 59. West wind around 8 mph.
7-day forecast for Affton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 59°F | Mostly Cloudy | 8 mph W | 0% |
| Tonight | 46°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 63°F | Sunny | 6 to 9 mph W | 9% |
| Thursday Night | 46°F | Isolated Rain Showers then Mostly Cloudy | 5 mph NW | 16% |
| Friday | 55°F | Partly Sunny | 8 mph N | 6% |
| Friday Night | 36°F | Mostly Clear | 1 to 6 mph N | 0% |
| Saturday | 54°F | Mostly Sunny | 2 mph N | 0% |
| Saturday Night | 34°F | Mostly Clear | 1 mph NW | 0% |
| Sunday | 59°F | Sunny | 3 mph W | 0% |
| Sunday Night | 37°F | Mostly Clear | 1 mph W | 0% |
| Monday | 64°F | Sunny | 3 mph SW | 0% |
| Monday Night | 42°F | Clear | 2 mph SW | 1% |
| Tuesday | 65°F | Sunny | 3 mph W | 3% |
| Tuesday Night | 43°F | Mostly Clear | 1 mph NW | 3% |
Forecast source: National Weather Service (api.weather.gov) for Affton (38.550, -90.326). Updated through the day.
Growing snapshot for Affton
Last spring frost
Apr 1
First fall frost
Nov 4
Growing season
218 days
Hardiness zone
7a
More local growing data for Affton: nearby ZIP 63123 weather · frost dates · planting calendar · Missouri frost dates
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Climate data from the nearest NOAA station, St Louis Sci Ctr, Mo (6.5 mi from Affton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.