Lake St. Louis, MO Weather & Growing Conditions
Today
58°F
Patchy Drizzle then Mostly Cloudy
Patchy drizzle before noon. Mostly cloudy, with a high near 58. West wind 7 to 12 mph, with gusts as high as 21 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 58°F | Patchy Drizzle then Mostly Cloudy | 7 to 12 mph W | 0% |
| Tonight | 42°F | Partly Cloudy | 6 mph W | 0% |
| Thursday | 61°F | Mostly Sunny | 6 to 12 mph W | 9% |
| Thursday Night | 43°F | Isolated Rain Showers then Mostly Cloudy | 6 mph NW | 17% |
| Friday | 56°F | Partly Sunny | 6 to 10 mph N | 5% |
| Friday Night | 33°F | Partly Cloudy | 1 to 5 mph N | 0% |
| Saturday | 55°F | Mostly Sunny | 3 mph N | 0% |
| Saturday Night | 32°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 61°F | Sunny | 5 mph NW | 1% |
| Sunday Night | 34°F | Clear | 1 mph W | 0% |
| Monday | 66°F | Sunny | 1 to 5 mph SW | 0% |
| Monday Night | 39°F | Clear | 3 mph SW | 0% |
| Tuesday | 68°F | Sunny | 3 mph W | 1% |
| Tuesday Night | 41°F | Mostly Clear | 1 mph N | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lake St. Louis, MO
Last spring frost
Apr 10
First fall frost
Oct 26
Growing season
199 days
Hardiness zone
6b
Explore more for Lake St. Louis, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, Weldon Spring Nws, Mo (8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.