Potosi, WI Weather & Growing Conditions
Today
81°F
Isolated Rain Showers then Scattered Showers And Thunderstorms
Isolated rain showers between 10am and noon, then scattered showers and thunderstorms. Mostly cloudy. High near 81, with temperatures falling to around 77 in the afternoon. Southwest wind 6 to 9 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Isolated Rain Showers then Scattered Showers And Thunderstorms | 6 to 9 mph SW | 30% |
| Tonight | 64°F | Scattered Showers And Thunderstorms then Showers And Thunderstorms | 6 mph NW | 76% |
| Wednesday | 75°F | Chance Showers And Thunderstorms | 5 mph NW | 45% |
| Wednesday Night | 57°F | Slight Chance Rain Showers | 3 mph NW | 19% |
| Thursday | 79°F | Sunny | 2 mph NE | 14% |
| Thursday Night | 60°F | Mostly Clear | 1 mph SE | 0% |
| Friday | 81°F | Sunny | 1 to 7 mph S | 4% |
| Friday Night | 64°F | Mostly Clear | 5 mph S | 7% |
| Saturday | 83°F | Mostly Sunny | 5 to 8 mph SW | 9% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms | 6 to 9 mph S | 28% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 12 mph SW | 28% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 6 to 9 mph S | 42% |
| Monday | 83°F | Chance Rain Showers | 9 mph S | 42% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 9 mph NE | 39% |
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 Aug 4, 2026.