Sussex, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sussex, a village in Waukesha County, Wisconsin.
Today
63°F
Isolated Rain Showers
Isolated rain showers. Cloudy. High near 63, with temperatures falling to around 54 in the afternoon. Southwest wind around 15 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Sussex
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 63°F | Isolated Rain Showers | 15 mph SW | 22% |
| Tonight | 45°F | Cloudy then Chance Rain Showers | 10 to 15 mph SW | 36% |
| Thursday | 54°F | Rain Showers Likely then Chance Light Rain | 10 to 15 mph W | 58% |
| Thursday Night | 38°F | Chance Light Rain then Mostly Cloudy | 10 mph N | 33% |
| Friday | 47°F | Mostly Cloudy | 10 to 15 mph N | 10% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 49°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 33°F | Mostly Clear | 0 to 5 mph W | 2% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 7% |
| Sunday Night | 35°F | Mostly Clear | 5 mph W | 1% |
| Monday | 58°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 40°F | Mostly Clear | 5 to 10 mph W | 1% |
| Tuesday | 59°F | Sunny | 5 to 10 mph NW | 2% |
| Tuesday Night | 38°F | Partly Cloudy | 0 to 5 mph NW | 2% |
Forecast source: National Weather Service (api.weather.gov) for Sussex (43.135, -88.226). Updated through the day.
Growing snapshot for Sussex
Last spring frost
Apr 30
First fall frost
Oct 16
Growing season
167 days
Hardiness zone
5b
More local growing data for Sussex: nearby ZIP 53089 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Big Bend
Brookfield
Butler
Chenequa
Delafield
Dousman
Eagle
Elm Grove
Hartland
Lac La Belle
Lannon
Menomonee Falls
Merton
Mukwonago
Muskego
Nashotah
New Berlin
North Lake
North Prairie
Oconomowoc
Oconomowoc Lake
Okauchee Lake
Pewaukee
Pewaukee
Potter Lake
Summit
Vernon
Wales
Waukesha
Waukesha
Climate data from the nearest NOAA station, Richfield 3 Ssw, Wi (4.8 mi from Sussex). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.