Potosi, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Potosi, a village in Grant County, Wisconsin.
Overnight
53°F
Mostly Cloudy
Mostly cloudy. Low around 53, with temperatures rising to around 56 overnight. South wind around 13 mph.
7-day forecast for Potosi
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Mostly Cloudy | 13 mph S | 6% |
| Wednesday | 56°F | Chance Rain Showers | 15 mph SW | 43% |
| Wednesday Night | 46°F | Chance Rain Showers | 16 mph SW | 40% |
| Thursday | 53°F | Rain Showers Likely | 13 mph NW | 69% |
| Thursday Night | 40°F | Slight Chance Rain Showers then Mostly Cloudy | 13 mph N | 15% |
| Friday | 48°F | Partly Sunny | 5 to 10 mph N | 1% |
| Friday Night | 31°F | Mostly Clear | 3 mph N | 0% |
| Saturday | 50°F | Sunny | 1 to 6 mph NW | 0% |
| Saturday Night | 35°F | Mostly Clear | 5 mph W | 1% |
| Sunday | 55°F | Sunny | 5 to 8 mph W | 4% |
| Sunday Night | 37°F | Mostly Clear | 5 mph W | 0% |
| Monday | 60°F | Sunny | 2 to 12 mph SW | 0% |
| Monday Night | 41°F | Mostly Clear | 6 mph W | 0% |
| Tuesday | 60°F | Sunny | 5 mph NW | 0% |
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 Nov 4, 2026.