Port Penn, DE Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Penn, a community in New Castle County, Delaware.
This Afternoon
77°F
Mostly Sunny
Mostly sunny, with a high near 77. East wind 5 to 10 mph.
7-day forecast for Port Penn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Mostly Sunny | 5 to 10 mph E | 2% |
| Tonight | 65°F | Mostly Cloudy | 5 to 10 mph SE | 7% |
| Sunday | 80°F | Chance Rain Showers | 5 to 10 mph S | 30% |
| Sunday Night | 63°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 5 to 10 mph NW | 71% |
| Monday | 71°F | Chance Rain Showers | 10 mph NE | 30% |
| Monday Night | 58°F | Chance Rain Showers | 10 mph NE | 36% |
| Tuesday | 66°F | Chance Rain Showers | 10 to 15 mph NE | 44% |
| Tuesday Night | 56°F | Chance Rain Showers | 10 to 15 mph NE | 42% |
| Wednesday | 65°F | Chance Rain Showers | 15 mph NE | 32% |
| Wednesday Night | 56°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Thursday | 64°F | Chance Rain Showers | 15 mph NE | 34% |
| Thursday Night | 55°F | Chance Rain Showers | 10 to 15 mph N | 34% |
| Friday | 67°F | Chance Rain Showers | 10 mph N | 25% |
| Friday Night | 54°F | Slight Chance Rain Showers | 5 to 10 mph N | 23% |
Forecast source: National Weather Service (api.weather.gov) for Port Penn (39.515, -75.581). Updated through the day.
Growing snapshot for Port Penn
Last spring frost
Apr 7
First fall frost
Nov 1
Growing season
209 days
Hardiness zone
7b
More local growing data for Port Penn: nearby ZIP 19731 weather · frost dates · planting calendar · Delaware frost dates
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Climate data from the nearest NOAA station, Wilmington New Castle Co Ap, De (11.3 mi from Port Penn). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.