Winchester, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winchester, a city in St. Louis County, Missouri.
This Afternoon
74°F
Rain
Rain and a slight chance of thunderstorms. Cloudy. High near 74, with temperatures falling to around 67 in the afternoon. South wind 14 to 17 mph, with gusts as high as 30 mph. Chance of precipitation is 100%.
7-day forecast for Winchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Rain | 14 to 17 mph S | 96% |
| Tonight | 53°F | Light Rain | 6 to 13 mph S | 84% |
| Wednesday | 63°F | Mostly Cloudy | 6 to 12 mph W | 3% |
| Wednesday Night | 43°F | Partly Cloudy | 5 mph SW | 0% |
| Thursday | 66°F | Sunny | 5 to 9 mph W | 2% |
| Thursday Night | 44°F | Mostly Cloudy | 5 mph NW | 10% |
| Friday | 58°F | Mostly Cloudy | 5 to 8 mph NW | 5% |
| Friday Night | 39°F | Mostly Cloudy | 1 to 5 mph N | 2% |
| Saturday | 57°F | Partly Sunny | 3 mph NW | 0% |
| Saturday Night | 37°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 63°F | Sunny | 1 to 5 mph W | 9% |
| Sunday Night | 37°F | Mostly Clear | 3 mph W | 5% |
| Monday | 67°F | Sunny | 2 to 6 mph SW | 2% |
| Monday Night | 41°F | Mostly Clear | 3 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov) for Winchester (38.590, -90.526). Updated through the day.
Growing snapshot for Winchester
Last spring frost
Apr 4
First fall frost
Oct 29
Growing season
206 days
Hardiness zone
7a
More local growing data for Winchester: nearby ZIP 63021 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 Charles 7 Ssw, Mo (8.1 mi from Winchester). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.