Port Washington, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Washington, a city in Ozaukee County, Wisconsin.
Overnight
56°F
Light Rain
Rain. Cloudy, with a low around 56. South wind 10 to 15 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Port Washington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Light Rain | 10 to 15 mph S | 80% |
| Wednesday | 62°F | Chance Light Rain | 15 mph S | 49% |
| Wednesday Night | 46°F | Cloudy then Chance Light Rain | 15 mph SW | 45% |
| Thursday | 55°F | Light Rain Likely | 10 to 15 mph W | 64% |
| Thursday Night | 38°F | Chance Light Rain then Cloudy | 15 mph N | 46% |
| Friday | 48°F | Slight Chance Light Rain | 15 to 20 mph N | 24% |
| Friday Night | 34°F | Partly Cloudy | 5 to 10 mph N | 2% |
| Saturday | 50°F | Sunny | 5 mph NW | 0% |
| Saturday Night | 36°F | Partly Cloudy | 5 to 10 mph W | 2% |
| Sunday | 54°F | Sunny | 10 to 15 mph W | 7% |
| Sunday Night | 37°F | Mostly Clear | 5 to 10 mph W | 1% |
| Monday | 57°F | Sunny | 5 to 15 mph SW | 0% |
| Monday Night | 42°F | Partly Cloudy | 10 mph W | 0% |
| Tuesday | 57°F | Sunny | 5 to 10 mph NW | 4% |
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 Nov 4, 2026.