St. Peter, WI Weather & Growing Conditions
Tonight
58°F
Rain Showers
Rain showers. Cloudy, with a low around 58. South wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Rain Showers | 15 mph S | 91% |
| Wednesday | 63°F | Rain Showers | 15 mph S | 85% |
| Wednesday Night | 47°F | Slight Chance Rain Showers then Chance Light Rain | 10 to 15 mph SW | 53% |
| Thursday | 53°F | Light Rain | 10 to 15 mph W | 85% |
| Thursday Night | 37°F | Chance Light Rain | 10 to 15 mph N | 49% |
| Friday | 47°F | Slight Chance Light Rain then Partly Sunny | 10 to 15 mph N | 22% |
| Friday Night | 32°F | Partly Cloudy | 5 to 10 mph N | 3% |
| Saturday | 50°F | Mostly Sunny | 5 mph W | 2% |
| Saturday Night | 34°F | Partly Cloudy | 5 mph W | 9% |
| Sunday | 55°F | Slight Chance Light Rain | 5 to 15 mph W | 16% |
| Sunday Night | 36°F | Mostly Clear | 5 to 10 mph W | 5% |
| Monday | 57°F | Mostly Sunny | 5 to 15 mph SW | 2% |
| Monday Night | 40°F | Partly Cloudy | 10 mph W | 1% |
| Tuesday | 57°F | Mostly Sunny | 10 to 15 mph W | 0% |
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 Nov 4, 2026.