Port Washington, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Washington, a city in Ozaukee County, Wisconsin.
This Afternoon
63°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 3pm. Cloudy, with a high near 63. East wind around 10 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Port Washington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 63°F | Chance Showers And Thunderstorms | 10 mph E | 37% |
| Tonight | 60°F | Showers And Thunderstorms Likely | 5 to 15 mph NE | 71% |
| Sunday | 63°F | Slight Chance Rain Showers then Mostly Cloudy | 15 to 25 mph NE | 16% |
| Sunday Night | 54°F | Mostly Cloudy | 15 to 20 mph NE | 3% |
| Monday | 63°F | Mostly Cloudy | 15 to 20 mph NE | 7% |
| Monday Night | 51°F | Mostly Cloudy | 10 to 15 mph NE | 8% |
| Tuesday | 63°F | Mostly Cloudy | 10 to 15 mph NE | 7% |
| Tuesday Night | 51°F | Mostly Cloudy | 10 to 15 mph NE | 9% |
| Wednesday | 62°F | Partly Sunny | 10 to 15 mph NE | 13% |
| Wednesday Night | 52°F | Mostly Cloudy | 5 to 10 mph NE | 5% |
| Thursday | 64°F | Partly Sunny | 5 to 10 mph NE | 3% |
| Thursday Night | 54°F | Mostly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 67°F | Partly Sunny | 5 mph NE | 6% |
| Friday Night | 55°F | Partly Cloudy | 0 to 5 mph NE | 3% |
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 Sep 19, 2026.