New Castle, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Castle, a city in Lawrence County, Pennsylvania.
Tonight
56°F
Partly Cloudy then Patchy Fog
Patchy fog between 2am and 3am. Partly cloudy, with a low around 56. Northeast wind around 5 mph.
7-day forecast for New Castle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Partly Cloudy then Patchy Fog | 5 mph NE | 7% |
| Saturday | 78°F | Partly Sunny then Slight Chance Rain Showers | 5 mph E | 17% |
| Saturday Night | 63°F | Mostly Cloudy then Slight Chance Showers And Thunderstorms | 3 mph SE | 74% |
| Sunday | 77°F | Showers And Thunderstorms | 6 mph SW | 93% |
| Sunday Night | 56°F | Showers And Thunderstorms | 7 mph N | 79% |
| Monday | 70°F | Mostly Cloudy then Slight Chance Rain Showers | 8 mph NE | 21% |
| Monday Night | 55°F | Chance Rain Showers | 10 mph NE | 50% |
| Tuesday | 67°F | Rain Showers Likely | 12 mph E | 55% |
| Tuesday Night | 53°F | Showers And Thunderstorms Likely | 14 mph E | 62% |
| Wednesday | 65°F | Rain Showers Likely | 13 mph E | 62% |
| Wednesday Night | 52°F | Chance Showers And Thunderstorms | 9 to 13 mph E | 53% |
| Thursday | 66°F | Chance Rain Showers | 7 to 10 mph E | 43% |
| Thursday Night | 52°F | Slight Chance Rain Showers | 2 to 6 mph NE | 17% |
| Friday | 71°F | Slight Chance Rain Showers | 3 to 7 mph N | 16% |
Forecast source: National Weather Service (api.weather.gov) for New Castle (40.996, -80.346). Updated through the day.
Growing snapshot for New Castle
Last spring frost
Apr 30
First fall frost
Oct 23
Growing season
175 days
Hardiness zone
6a
More local growing data for New Castle: nearby ZIP 16101 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Bessemer
Chewton
Edinburg
Ellport
Ellwood City
Enon Valley
Frisco
Frizzleburg
Hillsville
Mount Jackson
New Beaver
New Bedford
New Castle Northwest
New Galilee
New Wilmington
Oakland
Oakwood
Pulaski
S.N.P.J.
South New Castle
Volant
Wampum
West Pittsburg
Wurtemburg
Climate data from the nearest NOAA station, New Castle 1 N, Pa (4.4 mi from New Castle). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.