New Castle, PA Weather & Growing Conditions
This Afternoon
78°F
Chance Light Rain
A chance of rain. Mostly cloudy, with a high near 78. South wind around 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Chance Light Rain | 7 mph S | 38% |
| Tonight | 58°F | Light Rain Likely | 7 to 12 mph S | 72% |
| Thursday | 68°F | Slight Chance Light Rain then Mostly Sunny | 7 to 12 mph SW | 21% |
| Thursday Night | 46°F | Mostly Cloudy | 6 mph SW | 3% |
| Friday | 60°F | Light Rain Likely | 5 to 8 mph W | 55% |
| Friday Night | 36°F | Light Rain Likely | 3 to 7 mph W | 55% |
| Saturday | 52°F | Chance Light Rain | 7 to 13 mph W | 47% |
| Saturday Night | 33°F | Chance Light Rain then Mostly Cloudy | 9 mph W | 47% |
| Sunday | 56°F | Partly Sunny | 7 to 12 mph W | 3% |
| Sunday Night | 32°F | Mostly Clear | 7 mph W | 6% |
| Monday | 58°F | Mostly Sunny | 6 to 12 mph W | 6% |
| Monday Night | 34°F | Mostly Clear | 7 mph SW | 3% |
| Tuesday | 62°F | Sunny | 7 to 10 mph SW | 2% |
| Tuesday Night | 32°F | Partly Cloudy | 2 to 6 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for New Castle, PA
Last spring frost
Apr 30
First fall frost
Oct 23
Growing season
175 days
Hardiness zone
6a
Explore more for New Castle, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, New Castle 1 N, Pa (4.4 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.