Potosi, WI Weather & Growing Conditions
Tonight
63°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 1am, then showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 63. East wind 10 to 14 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 63°F | Chance Showers And Thunderstorms | 10 to 14 mph E | 86% |
| Saturday | 75°F | Showers And Thunderstorms | 7 to 13 mph SE | 81% |
| Saturday Night | 60°F | Showers And Thunderstorms | 7 to 12 mph NE | 80% |
| Sunday | 67°F | Chance Rain Showers | 15 mph NE | 49% |
| Sunday Night | 54°F | Chance Rain Showers then Mostly Cloudy | 15 mph NE | 28% |
| Monday | 63°F | Chance Rain Showers | 15 mph NE | 42% |
| Monday Night | 50°F | Chance Rain Showers | 9 to 15 mph NE | 42% |
| Tuesday | 61°F | Chance Rain Showers | 9 to 13 mph NE | 35% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 9 mph NE | 8% |
| Wednesday | 65°F | Mostly Sunny | 7 mph NE | 2% |
| Wednesday Night | 50°F | Partly Cloudy | 5 mph NE | 2% |
| Thursday | 67°F | Mostly Sunny | 5 mph NE | 5% |
| Thursday Night | 52°F | Partly Cloudy | 2 mph NE | 5% |
| Friday | 69°F | Mostly Sunny | 5 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Potosi, WI
Last spring frost
Apr 27
First fall frost
Oct 11
Growing season
166 days
Hardiness zone
5a
Explore more for Potosi, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Lancaster 4 Wsw, Wi (9.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.