New Castle, DE Weather & Growing Conditions
Today
79°F
Light Rain Likely then Chance T-storms
Rain likely before 5pm, then a chance of thunderstorms and a chance of rain. Mostly cloudy, with a high near 79. South wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Light Rain Likely then Chance T-storms | 5 to 10 mph S | 68% |
| Tonight | 64°F | Chance T-storms then Mostly Cloudy | 5 to 10 mph W | 60% |
| Monday | 72°F | Mostly Cloudy then Chance Rain Showers | 10 mph NE | 31% |
| Monday Night | 59°F | Rain Showers Likely | 10 mph NE | 59% |
| Tuesday | 65°F | Rain Showers Likely | 10 to 15 mph NE | 59% |
| Tuesday Night | 56°F | Rain Showers Likely | 15 mph NE | 56% |
| Wednesday | 65°F | Chance Rain Showers | 10 to 15 mph NE | 43% |
| Wednesday Night | 56°F | Chance Rain Showers | 15 mph NE | 32% |
| Thursday | 64°F | Chance Rain Showers | 15 mph NE | 30% |
| Thursday Night | 54°F | Chance Rain Showers | 10 to 15 mph NE | 28% |
| Friday | 66°F | Chance Rain Showers | 10 to 15 mph N | 27% |
| Friday Night | 54°F | Slight Chance Rain Showers | 10 mph N | 20% |
| Saturday | 69°F | Mostly Sunny | 10 mph N | 14% |
| Saturday Night | 55°F | Mostly Cloudy | 5 to 10 mph N | 14% |
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 Sep 20, 2026.