Port Washington, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Washington, a city in Ozaukee County, Wisconsin.
Today
80°F
Mostly Sunny
Mostly sunny, with a high near 80. South wind 10 to 15 mph.
7-day forecast for Port Washington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Mostly Sunny | 10 to 15 mph S | 9% |
| Tonight | 65°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph SW | 86% |
| Wednesday | 74°F | Patchy Fog | 5 mph N | 58% |
| Wednesday Night | 61°F | Chance Showers And Thunderstorms | 0 mph | 34% |
| Thursday | 77°F | Mostly Sunny | 0 to 5 mph NE | 14% |
| Thursday Night | 62°F | Mostly Clear | 0 to 5 mph SW | 5% |
| Friday | 81°F | Sunny | 0 to 5 mph SW | 2% |
| Friday Night | 64°F | Mostly Clear | 5 mph S | 6% |
| Saturday | 80°F | Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 30% |
| Sunday | 81°F | Chance Showers And Thunderstorms | 10 mph SW | 30% |
| Sunday Night | 65°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 51% |
| Monday | 79°F | Chance Rain Showers | 5 mph S | 39% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 5 mph N | 44% |
Forecast source: National Weather Service (api.weather.gov) for Port Washington (43.385, -87.884). Updated through the day.
Growing snapshot for Port Washington
Last spring frost
Apr 27
First fall frost
Oct 22
Growing season
176 days
Hardiness zone
5b
More local growing data for Port Washington: nearby ZIP 53074 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Port Washington, Wi (2.8 mi from Port Washington). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.