Lake St. Clair, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Lake St. Clair, a community in Franklin County, Missouri.
Tonight
70°F
Slight Chance Showers And Thunderstorms then Mostly Clear
A slight chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 70. South wind 0 to 3 mph. Chance of precipitation is 20%.
7-day forecast for Lake St. Clair
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 70°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 0 to 3 mph S | 21% |
| Saturday | 96°F | Partly Sunny | 5 mph SW | 4% |
| Saturday Night | 71°F | Partly Cloudy | 3 mph SW | 2% |
| Sunday | 92°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 mph W | 17% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 2 mph NE | 67% |
| Monday | 79°F | Showers And Thunderstorms Likely | 3 mph N | 68% |
| Monday Night | 58°F | Showers And Thunderstorms Likely | 3 mph N | 68% |
| Tuesday | 70°F | Chance Rain Showers then Mostly Cloudy | 6 mph N | 25% |
| Tuesday Night | 52°F | Mostly Cloudy | 1 to 6 mph N | 5% |
| Wednesday | 72°F | Mostly Sunny | 3 mph N | 1% |
| Wednesday Night | 52°F | Partly Cloudy | 2 mph N | 1% |
| Thursday | 74°F | Mostly Sunny | 2 mph N | 3% |
| Thursday Night | 55°F | Partly Cloudy | 1 mph NE | 3% |
| Friday | 74°F | Mostly Sunny | 3 mph NE | 8% |
Forecast source: National Weather Service (api.weather.gov) for Lake St. Clair (38.323, -90.999). Updated through the day.
Growing snapshot for Lake St. Clair
Last spring frost
Apr 11
First fall frost
Oct 23
Growing season
194 days
Hardiness zone
6b
More local growing data for Lake St. Clair: nearby ZIP 63077 weather · frost dates · planting calendar · Missouri frost dates
Nearby towns & communities
Berger
Charmwood
Gerald
Gray Summit
LaBarque Creek
Lake Tekakwitha
Leslie
Miramiguoa Park
New Haven
Oak Grove Village
Pacific
Parkway
St. Clair
Stanton
Sullivan
Three Creeks
Union
Villa Ridge
Washington
Climate data from the nearest NOAA station, Union, Mo (8 mi from Lake St. Clair). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.