St. Peters, MO Weather & Growing Conditions
Overnight
53°F
Slight Chance Drizzle
A slight chance of drizzle before 5am. Mostly cloudy, with a low around 53. Southwest wind around 9 mph, with gusts as high as 22 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Slight Chance Drizzle | 9 mph SW | 14% |
| Wednesday | 62°F | Mostly Cloudy | 8 to 15 mph W | 5% |
| Wednesday Night | 43°F | Partly Cloudy | 6 mph W | 0% |
| Thursday | 64°F | Sunny | 6 to 12 mph W | 0% |
| Thursday Night | 45°F | Mostly Cloudy | 6 mph NW | 3% |
| Friday | 57°F | Partly Sunny | 7 to 10 mph N | 3% |
| Friday Night | 35°F | Partly Cloudy | 1 to 6 mph N | 0% |
| Saturday | 56°F | Mostly Sunny | 3 mph NW | 0% |
| Saturday Night | 34°F | Partly Cloudy | 2 mph NW | 0% |
| Sunday | 62°F | Sunny | 2 to 6 mph NW | 1% |
| Sunday Night | 36°F | Clear | 2 mph W | 0% |
| Monday | 66°F | Sunny | 1 to 5 mph SW | 0% |
| Monday Night | 41°F | Clear | 3 mph SW | 0% |
| Tuesday | 69°F | Sunny | 3 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Peters, MO
Last spring frost
Apr 9
First fall frost
Oct 26
Growing season
198 days
Hardiness zone
6b
Explore more for St. Peters, MO: full frost dates · planting calendar · Missouri frost dates
Climate data from the nearest NOAA station, St Peters 2 Se, Mo (2.6 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.