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Potosi, WI Weather & Growing Conditions

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

Today
73°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a high near 73. South wind around 8 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

7-day forecast for Potosi

WhenTempForecastWindPrecip
Today 73°F Showers And Thunderstorms 8 mph S 83%
Tonight 60°F Showers And Thunderstorms 5 to 13 mph NE 77%
Sunday 64°F Rain Showers Likely 15 mph NE 55%
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%
Friday Night 52°F Partly Cloudy 3 mph E 3%

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

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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.