Harman US

Potosi, WI Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Potosi, a village in Grant County, Wisconsin.

Overnight
63°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 63. East wind around 12 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

7-day forecast for Potosi

WhenTempForecastWindPrecip
Overnight 63°F Showers And Thunderstorms 12 mph E 94%
Saturday 75°F Showers And Thunderstorms 8 to 12 mph SE 91%
Saturday Night 60°F Showers And Thunderstorms 6 to 13 mph NE 90%
Sunday 68°F Chance Rain Showers 15 mph NE 31%
Sunday Night 54°F Chance Rain Showers 15 mph NE 26%
Monday 63°F Chance Rain Showers 15 mph NE 26%
Monday Night 49°F Slight Chance Rain Showers 9 to 13 mph NE 23%
Tuesday 62°F Slight Chance Rain Showers then Partly Sunny 9 to 13 mph NE 23%
Tuesday Night 46°F Partly Cloudy 5 to 8 mph NE 4%
Wednesday 65°F Sunny 8 mph NE 2%
Wednesday Night 50°F Partly Cloudy 5 mph NE 2%
Thursday 67°F Mostly Sunny 6 mph NE 6%
Thursday Night 52°F Partly Cloudy 3 mph NE 3%
Friday 70°F Mostly Sunny 2 to 6 mph E 4%

Forecast source: National Weather Service (api.weather.gov) for Potosi (42.686, -90.708). Updated through the day.

Growing snapshot for Potosi

Last spring frost
Apr 27
First fall frost
Oct 11
Growing season
166 days
Hardiness zone
5a

More local growing data for Potosi: nearby ZIP 53820 weather · frost dates · planting calendar · Wisconsin frost dates

Nearby towns & communities

All Wisconsin locations ›

Climate data from the nearest NOAA station, Lancaster 4 Wsw, Wi (9.9 mi from Potosi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.