South New Castle, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South New Castle, a borough in Lawrence County, Pennsylvania.
Today
74°F
Mostly Cloudy then Chance Light Rain
A chance of rain after 1pm. Mostly cloudy, with a high near 74. South wind 8 to 13 mph, with gusts as high as 24 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for South New Castle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Mostly Cloudy then Chance Light Rain | 8 to 13 mph S | 41% |
| Tonight | 58°F | Light Rain Likely | 7 to 10 mph S | 71% |
| Thursday | 68°F | Slight Chance Light Rain then Partly Sunny | 5 to 10 mph SW | 19% |
| Thursday Night | 44°F | Partly Cloudy | 1 to 5 mph SW | 0% |
| Friday | 61°F | Chance Light Rain | 1 to 6 mph SW | 27% |
| Friday Night | 39°F | Chance Light Rain | 2 to 6 mph W | 48% |
| Saturday | 52°F | Chance Light Rain | 6 to 10 mph W | 42% |
| Saturday Night | 32°F | Chance Light Rain | 3 to 7 mph W | 37% |
| Sunday | 54°F | Partly Sunny | 5 to 10 mph W | 7% |
| Sunday Night | 31°F | Partly Cloudy | 6 mph W | 6% |
| Monday | 56°F | Mostly Sunny | 5 to 9 mph W | 14% |
| Monday Night | 32°F | Mostly Clear | 2 to 6 mph SW | 14% |
| Tuesday | 60°F | Mostly Sunny | 6 to 10 mph SW | 4% |
| Tuesday Night | 31°F | Partly Cloudy | 1 to 6 mph W | 4% |
Forecast source: National Weather Service (api.weather.gov) for South New Castle (40.975, -80.346). Updated through the day.
Growing snapshot for South New Castle
Last spring frost
Apr 30
First fall frost
Oct 23
Growing season
175 days
Hardiness zone
6b
More local growing data for South New Castle: nearby ZIP 16160 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
New Castle Northwest
New Galilee
New Wilmington
Oakland
Oakwood
Pulaski
S.N.P.J.
Volant
Wampum
West Pittsburg
Wurtemburg
Climate data from the nearest NOAA station, New Castle 1 N, Pa (6.1 mi from South New Castle). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.