Harman US

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

WhenTempForecastWindPrecip
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

All Wisconsin locations ›

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.