St. John, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. John, a city in St. Louis County, Missouri.
Tonight
48°F
Partly Cloudy
Partly cloudy, with a low around 48. West wind 6 to 9 mph.
7-day forecast for St. John
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 48°F | Partly Cloudy | 6 to 9 mph W | 0% |
| Thursday | 62°F | Mostly Sunny | 7 to 10 mph W | 9% |
| Thursday Night | 47°F | Slight Chance Light Rain then Mostly Cloudy | 5 to 8 mph NW | 16% |
| Friday | 55°F | Partly Sunny | 10 mph N | 5% |
| Friday Night | 37°F | Mostly Clear | 2 to 7 mph N | 0% |
| Saturday | 54°F | Mostly Sunny | 3 mph N | 0% |
| Saturday Night | 36°F | Mostly Clear | 2 mph NW | 0% |
| Sunday | 59°F | Sunny | 5 mph W | 0% |
| Sunday Night | 39°F | Mostly Clear | 2 mph W | 0% |
| Monday | 64°F | Sunny | 5 mph SW | 0% |
| Monday Night | 44°F | Clear | 3 mph SW | 1% |
| Tuesday | 65°F | Sunny | 3 mph W | 3% |
| Tuesday Night | 45°F | Mostly Clear | 2 mph NW | 3% |
| Veterans Day | 66°F | Mostly Sunny | 3 mph N | 3% |
Forecast source: National Weather Service (api.weather.gov) for St. John (38.715, -90.346). Updated through the day.
Growing snapshot for St. John
Last spring frost
Apr 2
First fall frost
Nov 4
Growing season
215 days
Hardiness zone
7a
More local growing data for St. John: nearby ZIP 63114 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Affton
Ballwin
Bel-Nor
Bel-Ridge
Bella Villa
Bellefontaine Neighbors
Bellerive Acres
Berkeley
Beverly Hills
Black Jack
Breckenridge Hills
Brentwood
Bridgeton
Calverton Park
Castle Point
Champ
Charlack
Chesterfield
Clarkson Valley
Clayton
Concord
Cool Valley
Country Club Hills
Country Life Acres
Crestwood
Creve Coeur
Crystal Lake Park
Dellwood
Des Peres
Edmundson
Climate data from the nearest NOAA station, St Louis Lambert Intl Ap, Mo (3.5 mi from St. John). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.