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
49°F
Light Rain Likely
Rain likely before 10pm, then a chance of rain showers between 10pm and 11pm, then a slight chance of rain between midnight and 1am, then a chance of rain showers between 1am and 5am. Cloudy, with a low around 49. Southwest wind 6 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
7-day forecast for Lake St. Clair
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 49°F | Light Rain Likely | 6 to 10 mph SW | 63% |
| Wednesday | 61°F | Mostly Cloudy | 3 to 8 mph W | 3% |
| Wednesday Night | 39°F | Partly Cloudy | 3 mph SW | 0% |
| Thursday | 65°F | Sunny | 6 mph W | 4% |
| Thursday Night | 39°F | Mostly Cloudy | 3 mph NW | 13% |
| Friday | 56°F | Mostly Cloudy | 5 mph NW | 4% |
| Friday Night | 35°F | Mostly Cloudy | 1 mph N | 4% |
| Saturday | 56°F | Partly Sunny | 1 mph NW | 0% |
| Saturday Night | 32°F | Partly Cloudy | 1 mph NW | 2% |
| Sunday | 61°F | Sunny | 3 mph NW | 7% |
| Sunday Night | 32°F | Mostly Clear | 1 mph NW | 3% |
| Monday | 66°F | Sunny | 3 mph W | 2% |
| Monday Night | 37°F | Mostly Clear | 2 mph W | 1% |
| Tuesday | 69°F | Sunny | 2 mph W | 1% |
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 Nov 4, 2026.