Sister Bay, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sister Bay, a village in Door County, Wisconsin.
Today
79°F
Mostly Sunny then Chance Showers And Thunderstorms
A slight chance of rain showers between 2pm and 4pm, then a chance of showers and thunderstorms. Mostly sunny. High near 79, with temperatures falling to around 76 in the afternoon. Heat index values as high as 78. South southwest wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sister Bay
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Mostly Sunny then Chance Showers And Thunderstorms | 9 to 13 mph SSW | 34% |
| Tonight | 62°F | Chance Showers And Thunderstorms | 5 to 9 mph NNE | 56% |
| Wednesday | 75°F | Partly Sunny | 5 mph ENE | 10% |
| Wednesday Night | 61°F | Partly Cloudy | 5 mph SE | 5% |
| Thursday | 78°F | Sunny | 2 to 8 mph SSW | 2% |
| Thursday Night | 63°F | Mostly Clear | 8 mph SSW | 0% |
| Friday | 80°F | Sunny | 6 to 13 mph SSW | 2% |
| Friday Night | 64°F | Slight Chance Rain Showers | 7 to 12 mph SSW | 16% |
| Saturday | 82°F | Mostly Sunny then Chance Showers And Thunderstorms | 9 mph SSW | 27% |
| Saturday Night | 64°F | Chance Showers And Thunderstorms | 5 to 8 mph SW | 44% |
| Sunday | 79°F | Chance Showers And Thunderstorms | 6 to 9 mph SW | 44% |
| Sunday Night | 62°F | Chance Showers And Thunderstorms | 7 mph WSW | 32% |
| Monday | 79°F | Slight Chance Rain Showers | 6 mph SW | 24% |
| Monday Night | 62°F | Chance Rain Showers then Slight Chance Showers And Thunderstorms | 5 mph NE | 34% |
Forecast source: National Weather Service (api.weather.gov) for Sister Bay (45.187, -87.129). Updated through the day.
Growing snapshot for Sister Bay
Last spring frost
May 14
First fall frost
Oct 18
Growing season
155 days
Hardiness zone
5b
More local growing data for Sister Bay: nearby ZIP 54234 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Ephraim 1Ne-Wwtp, Wi (2.7 mi from Sister Bay). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.