Clarkson Valley, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Clarkson Valley, a city in St. Louis County, Missouri.
Today
89°F
Sunny
Sunny, with a high near 89. South wind around 5 mph.
7-day forecast for Clarkson Valley
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Sunny | 5 mph S | 0% |
| Tonight | 70°F | Mostly Clear | 5 mph S | 0% |
| Wednesday | 91°F | Sunny | 5 mph S | 11% |
| Wednesday Night | 72°F | Chance Showers And Thunderstorms | 6 mph S | 67% |
| Thursday | 87°F | Showers And Thunderstorms Likely | 5 mph S | 69% |
| Thursday Night | 71°F | Chance Showers And Thunderstorms | 3 mph SE | 29% |
| Friday | 88°F | Chance Showers And Thunderstorms then Partly Sunny | 3 mph SW | 29% |
| Friday Night | 71°F | Chance Showers And Thunderstorms | 2 mph S | 28% |
| Saturday | 90°F | Chance Showers And Thunderstorms then Mostly Sunny | 3 mph SW | 28% |
| Saturday Night | 73°F | Mostly Clear | 5 mph S | 6% |
| Sunday | 92°F | Sunny | 7 mph SW | 4% |
| Sunday Night | 75°F | Mostly Clear | 6 mph S | 5% |
| Monday | 94°F | Sunny | 7 mph SW | 5% |
| Monday Night | 76°F | Slight Chance Showers And Thunderstorms | 7 mph S | 15% |
Forecast source: National Weather Service (api.weather.gov) for Clarkson Valley (38.625, -90.593). Updated through the day.
Growing snapshot for Clarkson Valley
Last spring frost
Apr 4
First fall frost
Oct 29
Growing season
206 days
Hardiness zone
7a
More local growing data for Clarkson Valley: nearby ZIP 63011 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
Clayton
Concord
Cool Valley
Country Club Hills
Country Life Acres
Crestwood
Creve Coeur
Crystal Lake Park
Dellwood
Des Peres
Edmundson
Ellisville
Climate data from the nearest NOAA station, St Charles 7 Ssw, Mo (5.8 mi from Clarkson Valley). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.