Sussex, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sussex, a village in Waukesha County, Wisconsin.
Tonight
60°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a low around 60. Northeast wind 0 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Sussex
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Showers And Thunderstorms | 0 to 10 mph NE | 75% |
| Sunday | 64°F | Chance Showers And Thunderstorms then Mostly Cloudy | 10 to 15 mph NE | 45% |
| Sunday Night | 54°F | Mostly Cloudy | 10 to 15 mph NE | 3% |
| Monday | 61°F | Mostly Cloudy | 10 to 15 mph NE | 6% |
| Monday Night | 50°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 10 mph NE | 16% |
| Tuesday | 60°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 15 mph NE | 16% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NE | 8% |
| Wednesday | 61°F | Partly Sunny | 5 to 10 mph NE | 9% |
| Wednesday Night | 51°F | Mostly Cloudy | 0 to 10 mph NE | 4% |
| Thursday | 65°F | Partly Sunny | 0 to 5 mph NE | 3% |
| Thursday Night | 52°F | Mostly Cloudy | 0 to 5 mph NE | 6% |
| Friday | 68°F | Partly Sunny | 0 to 5 mph NE | 5% |
| Friday Night | 52°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Saturday | 70°F | Mostly Sunny | 0 to 5 mph NE | 4% |
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 Sep 20, 2026.