Castle Shannon, PA Weather & Growing Conditions
Today
78°F
Partly Sunny
Partly sunny, with a high near 78. East wind around 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Partly Sunny | 6 mph E | 4% |
| Tonight | 65°F | Showers And Thunderstorms Likely | 5 to 8 mph SE | 61% |
| Sunday | 77°F | Showers And Thunderstorms | 8 to 12 mph SW | 99% |
| Sunday Night | 56°F | Showers And Thunderstorms | 12 mph N | 99% |
| Monday | 67°F | Chance Rain Showers | 13 mph NE | 40% |
| Monday Night | 55°F | Rain Showers Likely | 14 mph NE | 64% |
| Tuesday | 63°F | Rain Showers Likely | 16 mph E | 64% |
| Tuesday Night | 52°F | Rain Showers Likely | 17 mph E | 63% |
| Wednesday | 62°F | Rain Showers Likely | 16 mph E | 63% |
| Wednesday Night | 52°F | Showers And Thunderstorms Likely | 12 to 15 mph E | 60% |
| Thursday | 65°F | Rain Showers Likely | 12 mph E | 57% |
| Thursday Night | 51°F | Chance Rain Showers | 7 to 12 mph NE | 28% |
| Friday | 67°F | Slight Chance Rain Showers | 9 mph NE | 19% |
| Friday Night | 51°F | Slight Chance Rain Showers then Partly Cloudy | 9 mph NE | 19% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Castle Shannon, PA
Last spring frost
Apr 18
First fall frost
Oct 28
Growing season
193 days
Hardiness zone
6b
Explore more for Castle Shannon, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Pittsburgh Allegheny Co Ap, Pa (5.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.