New Castle, PA Weather & Growing Conditions
Overnight
56°F
Partly Cloudy
Partly cloudy, with a low around 56. Northeast wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Partly Cloudy | 5 mph NE | 4% |
| Saturday | 77°F | Partly Sunny then Slight Chance Rain Showers | 6 mph E | 17% |
| Saturday Night | 63°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 5 mph SE | 74% |
| Sunday | 76°F | Showers And Thunderstorms | 7 mph SW | 93% |
| Sunday Night | 57°F | Showers And Thunderstorms | 8 mph N | 79% |
| Monday | 69°F | Mostly Cloudy then Slight Chance Rain Showers | 9 mph NE | 21% |
| Monday Night | 55°F | Chance Rain Showers | 9 to 13 mph E | 51% |
| Tuesday | 66°F | Rain Showers Likely | 13 mph E | 55% |
| Tuesday Night | 53°F | Showers And Thunderstorms Likely | 16 mph E | 62% |
| Wednesday | 64°F | Rain Showers Likely | 12 to 15 mph E | 62% |
| Wednesday Night | 52°F | Chance Showers And Thunderstorms | 12 to 15 mph E | 53% |
| Thursday | 66°F | Chance Rain Showers | 8 to 12 mph E | 43% |
| Thursday Night | 52°F | Slight Chance Rain Showers | 7 mph NE | 18% |
| Friday | 70°F | Slight Chance Rain Showers | 7 mph N | 17% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for New Castle, PA
Last spring frost
Apr 30
First fall frost
Oct 23
Growing season
175 days
Hardiness zone
6a
Explore more for New Castle, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, New Castle 1 N, Pa (4.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.