Sussex, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Sussex, a village in Waukesha County, Wisconsin.
This Afternoon
64°F
Scattered Showers And Thunderstorms
Scattered showers and thunderstorms before 5pm, then a chance of showers and thunderstorms. Cloudy, with a high near 64. East wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Sussex
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 64°F | Scattered Showers And Thunderstorms | 5 mph E | 51% |
| Tonight | 60°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph NE | 75% |
| Sunday | 64°F | Scattered Rain Showers 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% |
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
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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.