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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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
Nearby towns & communities
Bagley
Bloomington
Boscobel
Cuba City
Dickeyville
Fennimore
Glen Haven
Kieler
Lancaster
Livingston
Montfort
Mount Hope
Muscoda
Patch Grove
Platteville
Sandy Hook
Tennyson
Woodman
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.