Castle Shannon, PA Weather & Growing Conditions
Today
86°F
Sunny
Sunny, with a high near 86. East wind 2 to 6 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 2 to 6 mph E | 0% |
| Tonight | 68°F | Mostly Clear | 3 to 7 mph SE | 1% |
| Wednesday | 87°F | Partly Sunny then Scattered Showers And Thunderstorms | 3 to 7 mph S | 28% |
| Wednesday Night | 69°F | Scattered Showers And Thunderstorms | 6 mph S | 50% |
| Thursday | 86°F | Showers And Thunderstorms Likely | 5 to 9 mph SW | 71% |
| Thursday Night | 69°F | Showers And Thunderstorms Likely | 5 to 8 mph SW | 71% |
| Friday | 84°F | Showers And Thunderstorms | 6 to 9 mph SW | 83% |
| Friday Night | 68°F | Showers And Thunderstorms | 5 to 8 mph SW | 83% |
| Saturday | 83°F | Showers And Thunderstorms Likely | 9 mph SW | 55% |
| Saturday Night | 68°F | Showers And Thunderstorms Likely | 8 mph SW | 55% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms | 6 to 12 mph SW | 21% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 10 mph SW | 24% |
| Monday | 87°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 9 to 13 mph SW | 36% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 8 to 12 mph SW | 49% |
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 Aug 4, 2026.