New Castle Northwest, PA Weather & Growing Conditions
Today
85°F
Sunny
Sunny, with a high near 85. East wind around 2 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 2 mph E | 0% |
| Tonight | 64°F | Mostly Clear | 3 mph E | 0% |
| Wednesday | 87°F | Mostly Sunny then Scattered Showers And Thunderstorms | 5 mph S | 50% |
| Wednesday Night | 67°F | Scattered Showers And Thunderstorms | 2 mph S | 50% |
| Thursday | 86°F | Chance Rain Showers then Chance Showers And Thunderstorms | 2 to 7 mph SW | 54% |
| Thursday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 1 to 5 mph SW | 57% |
| Friday | 84°F | Showers And Thunderstorms | 2 to 7 mph SW | 82% |
| Friday Night | 65°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 1 to 5 mph SW | 82% |
| Saturday | 84°F | Chance Showers And Thunderstorms | 2 to 7 mph SW | 35% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms | 5 mph SW | 35% |
| Sunday | 87°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 2 to 8 mph SW | 21% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 3 to 7 mph SW | 26% |
| Monday | 86°F | Chance Rain Showers | 5 to 9 mph SW | 40% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 2 to 7 mph SW | 48% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for New Castle Northwest, PA
Last spring frost
Apr 30
First fall frost
Oct 23
Growing season
175 days
Hardiness zone
6a
Explore more for New Castle Northwest, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, New Castle 1 N, Pa (2.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.