New Castle, DE Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. East wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 mph E | 0% |
| Tonight | 70°F | Mostly Cloudy | 0 to 5 mph E | 13% |
| Wednesday | 84°F | Showers And Thunderstorms Likely | 5 mph SE | 77% |
| Wednesday Night | 74°F | Chance Showers And Thunderstorms | 5 mph S | 57% |
| Thursday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 19% |
| Thursday Night | 75°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 23% |
| Friday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 32% |
| Friday Night | 73°F | Chance Showers And Thunderstorms | 5 mph SW | 44% |
| Saturday | 87°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 36% |
| Saturday Night | 72°F | Chance Showers And Thunderstorms | 5 mph SW | 36% |
| Sunday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph W | 17% |
| Sunday Night | 73°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph SW | 17% |
| Monday | 89°F | Sunny | 5 to 10 mph W | 11% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph W | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for New Castle, DE
Last spring frost
Apr 7
First fall frost
Nov 1
Growing season
209 days
Hardiness zone
7b
Explore more for New Castle, DE: full frost dates · planting calendar · Delaware frost dates
Climate data from the nearest NOAA station, Wilmington New Castle Co Ap, De (1.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.