Williams Bay, WI Weather & Growing Conditions
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. Southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 5 to 10 mph SW | 3% |
| Tonight | 66°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 84% |
| Wednesday | 75°F | Showers And Thunderstorms | 0 to 5 mph W | 76% |
| Wednesday Night | 60°F | Showers And Thunderstorms Likely | 0 to 5 mph NW | 58% |
| Thursday | 78°F | Chance Rain Showers then Partly Sunny | 0 to 5 mph NE | 34% |
| Thursday Night | 59°F | Partly Cloudy | 0 mph | 12% |
| Friday | 80°F | Mostly Sunny | 0 to 5 mph SW | 2% |
| Friday Night | 62°F | Mostly Clear | 0 to 5 mph S | 6% |
| Saturday | 82°F | Mostly Sunny | 5 to 10 mph SW | 10% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 25% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 25% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 5 mph SW | 45% |
| Monday | 82°F | Chance Rain Showers | 5 mph S | 44% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 5 mph SW | 46% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Williams Bay, WI
Last spring frost
Apr 25
First fall frost
Oct 21
Growing season
179 days
Hardiness zone
5b
Explore more for Williams Bay, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Lake Geneva Wwtp, Wi (6.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.