Sister Bay, WI Weather & Growing Conditions
Tonight
52°F
Mostly Cloudy then Chance Rain Showers
A chance of rain showers after 1am. Mostly cloudy, with a low around 52. East southeast wind 3 to 7 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Mostly Cloudy then Chance Rain Showers | 3 to 7 mph ESE | 31% |
| Saturday | 66°F | Chance Rain Showers | 10 mph ESE | 42% |
| Saturday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 6 to 9 mph NE | 39% |
| Sunday | 67°F | Partly Sunny | 10 to 15 mph NNE | 3% |
| Sunday Night | 50°F | Mostly Cloudy | 10 to 15 mph NE | 0% |
| Monday | 63°F | Partly Sunny | 14 mph ENE | 0% |
| Monday Night | 50°F | Mostly Cloudy | 9 to 13 mph ENE | 1% |
| Tuesday | 64°F | Mostly Sunny | 13 mph ENE | 3% |
| Tuesday Night | 49°F | Partly Cloudy | 6 to 12 mph E | 6% |
| Wednesday | 65°F | Mostly Sunny | 6 to 10 mph ENE | 10% |
| Wednesday Night | 50°F | Partly Cloudy | 3 to 7 mph ENE | 6% |
| Thursday | 67°F | Mostly Sunny | 3 to 7 mph ENE | 3% |
| Thursday Night | 51°F | Partly Cloudy | 3 mph SSW | 3% |
| Friday | 70°F | Mostly Sunny | 6 mph N | 4% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Sister Bay, WI
Last spring frost
May 14
First fall frost
Oct 18
Growing season
155 days
Hardiness zone
5b
Explore more for Sister Bay, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Ephraim 1Ne-Wwtp, Wi (2.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.