Sister Bay, WI Weather & Growing Conditions
Today
61°F
Rain Showers
Rain showers and areas of fog. Mostly cloudy. High near 61, with temperatures falling to around 54 in the afternoon. South wind 10 to 14 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 61°F | Rain Showers | 10 to 14 mph S | 81% |
| Tonight | 43°F | Chance Rain Showers | 9 mph SSW | 51% |
| Thursday | 53°F | Rain Showers Likely | 9 to 18 mph WNW | 71% |
| Thursday Night | 33°F | Rain Showers Likely | 17 mph N | 64% |
| Friday | 47°F | Chance Rain Showers | 13 to 16 mph N | 38% |
| Friday Night | 33°F | Mostly Cloudy | 5 to 10 mph N | 3% |
| Saturday | 49°F | Mostly Sunny | 3 to 7 mph NW | 0% |
| Saturday Night | 34°F | Partly Cloudy | 3 to 7 mph W | 5% |
| Sunday | 53°F | Mostly Sunny | 7 to 10 mph W | 8% |
| Sunday Night | 35°F | Partly Cloudy | 7 mph WNW | 1% |
| Monday | 54°F | Mostly Sunny | 6 to 10 mph WSW | 2% |
| Monday Night | 38°F | Partly Cloudy | 8 mph W | 5% |
| Tuesday | 54°F | Mostly Sunny | 6 to 9 mph NW | 11% |
| Tuesday Night | 36°F | Partly Cloudy | 5 mph NW | 3% |
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 Nov 4, 2026.