St. Peters, MO Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Peters, a city in St. Charles County, Missouri.
Tonight
56°F
Light Rain Likely
Rain likely before 1am, then a slight chance of drizzle between 1am and 5am. Cloudy, with a low around 56. Southwest wind around 10 mph, with gusts as high as 22 mph. Chance of precipitation is 60%.
7-day forecast for St. Peters
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Light Rain Likely | 10 mph SW | 62% |
| Wednesday | 62°F | Mostly Cloudy | 7 to 14 mph W | 5% |
| Wednesday Night | 44°F | Partly Cloudy | 6 mph SW | 0% |
| Thursday | 65°F | Sunny | 6 to 10 mph W | 3% |
| Thursday Night | 44°F | Mostly Cloudy | 6 mph NW | 9% |
| Friday | 58°F | Partly Sunny | 6 to 9 mph NW | 4% |
| Friday Night | 39°F | Mostly Cloudy | 5 mph N | 1% |
| Saturday | 56°F | Partly Sunny | 3 mph NW | 0% |
| Saturday Night | 37°F | Partly Cloudy | 2 mph W | 1% |
| Sunday | 63°F | Sunny | 2 to 6 mph W | 9% |
| Sunday Night | 38°F | Mostly Clear | 3 mph W | 4% |
| Monday | 66°F | Sunny | 6 mph SW | 2% |
| Monday Night | 42°F | Mostly Clear | 5 mph SW | 1% |
| Tuesday | 69°F | Sunny | 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for St. Peters (38.782, -90.604). Updated through the day.
Growing snapshot for St. Peters
Last spring frost
Apr 9
First fall frost
Oct 26
Growing season
198 days
Hardiness zone
6b
More local growing data for St. Peters: nearby ZIP 63376 weather · frost dates · planting calendar · Missouri frost dates
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Climate data from the nearest NOAA station, St Peters 2 Se, Mo (2.6 mi from St. Peters). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.