St. Peters, MO Weather & Growing Conditions
This Afternoon
58°F
Cloudy
Cloudy, with a high near 58. West wind 7 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 58°F | Cloudy | 7 to 10 mph W | 0% |
| Tonight | 45°F | Partly Cloudy | 7 mph SW | 0% |
| Thursday | 62°F | Mostly Sunny | 7 to 10 mph W | 9% |
| Thursday Night | 45°F | Isolated Rain Showers then Mostly Cloudy | 7 mph NW | 16% |
| Friday | 55°F | Partly Sunny | 7 to 10 mph N | 4% |
| Friday Night | 34°F | Mostly Clear | 1 to 6 mph N | 0% |
| Saturday | 54°F | Mostly Sunny | 3 mph N | 0% |
| Saturday Night | 34°F | Mostly Clear | 1 mph NW | 0% |
| Sunday | 60°F | Sunny | 1 to 5 mph W | 0% |
| Sunday Night | 36°F | Mostly Clear | 1 mph W | 0% |
| Monday | 65°F | Sunny | 1 to 5 mph SW | 0% |
| Monday Night | 41°F | Clear | 3 mph SW | 1% |
| Tuesday | 66°F | Sunny | 3 mph W | 3% |
| Tuesday Night | 42°F | Mostly Clear | 1 mph NW | 3% |
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
7a
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 (3.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.