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.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. East wind around 5 mph.
7-day forecast for Port Penn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 mph E | 0% |
| Tonight | 69°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph SE | 16% |
| Wednesday | 84°F | Showers And Thunderstorms | 5 mph SE | 75% |
| Wednesday Night | 73°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph S | 63% |
| Thursday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 18% |
| Thursday Night | 74°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 19% |
| Friday | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 27% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 5 mph SW | 44% |
| Saturday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 36% |
| Saturday Night | 71°F | Chance Showers And Thunderstorms | 5 mph SW | 36% |
| Sunday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph W | 18% |
| Sunday Night | 73°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 18% |
| Monday | 90°F | Sunny | 5 to 10 mph W | 11% |
| Monday Night | 72°F | Partly Cloudy | 5 mph SW | 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
Nearby towns & communities
Arden
Ardencroft
Ardentown
Bear
Bellefonte
Brookside
Claymont
Delaware City
Edgemoor
Elsmere
Glasgow
Greenville
Hockessin
Middletown
New Castle
Newark
Newport
North Star
Odessa
Pike Creek
Pike Creek Valley
St. Georges
Townsend
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 Aug 4, 2026.