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.
Tonight
52°F
Mostly Clear then Patchy Fog
Patchy fog after 5am. Mostly clear, with a low around 52. South wind around 5 mph.
7-day forecast for Port Penn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 52°F | Mostly Clear then Patchy Fog | 5 mph S | 2% |
| Wednesday | 75°F | Patchy Fog then Sunny | 5 to 10 mph S | 4% |
| Wednesday Night | 60°F | Mostly Cloudy | 5 to 10 mph S | 5% |
| Thursday | 75°F | Chance Light Rain | 10 mph S | 33% |
| Thursday Night | 63°F | Light Rain | 5 to 10 mph S | 85% |
| Friday | 70°F | Light Rain | 5 mph W | 85% |
| Friday Night | 54°F | Chance Light Rain | 0 to 5 mph W | 78% |
| Saturday | 66°F | Chance Light Rain | 5 to 10 mph NW | 25% |
| Saturday Night | 45°F | Slight Chance Light Rain then Partly Cloudy | 5 mph NW | 15% |
| Sunday | 60°F | Mostly Sunny | 5 to 10 mph W | 6% |
| Sunday Night | 43°F | Slight Chance Light Rain | 5 mph W | 19% |
| Monday | 60°F | Slight Chance Light Rain | 5 to 10 mph NW | 21% |
| Monday Night | 42°F | Slight Chance Light Rain | 5 mph W | 21% |
| Tuesday | 63°F | Sunny | 5 to 10 mph W | 14% |
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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Middletown
New Castle
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Pike Creek
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Wilmington
Wilmington Manor
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 Nov 4, 2026.