St. Peter, WI Weather & Growing Conditions
Tonight
55°F
Rain Showers
Rain showers before 1am, then showers and thunderstorms. Cloudy, with a low around 55. East wind 10 to 15 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 55°F | Rain Showers | 10 to 15 mph E | 97% |
| Saturday | 63°F | Showers And Thunderstorms | 10 to 15 mph E | 95% |
| Saturday Night | 55°F | Showers And Thunderstorms | 10 to 15 mph NE | 76% |
| Sunday | 65°F | Slight Chance Rain Showers then Partly Sunny | 15 mph NE | 23% |
| Sunday Night | 52°F | Mostly Cloudy | 10 to 15 mph NE | 1% |
| Monday | 61°F | Mostly Cloudy | 10 to 15 mph NE | 8% |
| Monday Night | 48°F | Mostly Cloudy | 10 to 15 mph NE | 10% |
| Tuesday | 60°F | Partly Sunny | 10 to 15 mph NE | 9% |
| Tuesday Night | 48°F | Partly Cloudy | 5 to 10 mph NE | 8% |
| Wednesday | 63°F | Mostly Sunny | 5 to 10 mph NE | 8% |
| Wednesday Night | 50°F | Partly Cloudy | 5 mph NE | 3% |
| Thursday | 67°F | Mostly Sunny | 5 to 10 mph NE | 3% |
| Thursday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph N | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Peter, WI
Last spring frost
May 1
First fall frost
Oct 12
Growing season
162 days
Hardiness zone
5b
Explore more for St. Peter, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Fond Du Lac Wwtp, Wi (10.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.