New Castle, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Castle, a city in Lawrence County, Pennsylvania.
Overnight
51°F
Partly Cloudy
Partly cloudy, with a low around 51. Southeast wind around 1 mph.
7-day forecast for New Castle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Partly Cloudy | 1 mph SE | 1% |
| Wednesday | 77°F | Mostly Cloudy then Chance Light Rain | 1 to 9 mph S | 50% |
| Wednesday Night | 58°F | Light Rain | 6 to 10 mph S | 98% |
| Thursday | 68°F | Mostly Sunny | 5 to 10 mph SW | 5% |
| Thursday Night | 44°F | Partly Cloudy | 1 to 5 mph SW | 0% |
| Friday | 62°F | Chance Light Rain | 1 to 6 mph SW | 28% |
| Friday Night | 39°F | Chance Light Rain | 5 mph W | 48% |
| Saturday | 53°F | Chance Light Rain | 6 to 9 mph W | 42% |
| Saturday Night | 32°F | Chance Light Rain | 3 to 7 mph W | 37% |
| Sunday | 55°F | Partly Sunny | 5 to 10 mph W | 7% |
| Sunday Night | 31°F | Partly Cloudy | 6 mph W | 6% |
| Monday | 57°F | Mostly Sunny | 5 to 9 mph W | 14% |
| Monday Night | 32°F | Mostly Clear | 2 to 6 mph SW | 14% |
| Tuesday | 61°F | Mostly Sunny | 6 to 10 mph SW | 4% |
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 Nov 4, 2026.