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.
This Afternoon
78°F
Sunny
Sunny, with a high near 78. South wind 3 to 9 mph.
7-day forecast for South New Castle
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Sunny | 3 to 9 mph S | 1% |
| Tonight | 55°F | Mostly Clear | 5 mph SE | 3% |
| Wednesday | 76°F | Partly Sunny then Chance Light Rain | 5 to 9 mph S | 26% |
| Wednesday Night | 60°F | Light Rain | 6 to 10 mph S | 100% |
| Thursday | 69°F | Mostly Sunny | 5 to 10 mph SW | 14% |
| Thursday Night | 45°F | Partly Cloudy | 0 to 3 mph W | 2% |
| Friday | 64°F | Partly Sunny | 0 to 5 mph W | 14% |
| Friday Night | 42°F | Chance Light Rain | 3 mph NW | 27% |
| Saturday | 55°F | Chance Light Rain | 3 to 9 mph W | 30% |
| Saturday Night | 34°F | Chance Light Rain then Mostly Cloudy | 1 to 6 mph W | 30% |
| Sunday | 55°F | Partly Sunny then Slight Chance Light Rain | 2 to 8 mph W | 17% |
| Sunday Night | 33°F | Slight Chance Light Rain | 6 mph W | 18% |
| Monday | 57°F | Chance Light Rain | 6 to 10 mph W | 29% |
| Monday Night | 35°F | Chance Light Rain then Partly Cloudy | 7 mph SW | 29% |
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 3, 2026.