Greencastle, PA Weather & Growing Conditions
Tonight
50°F
Mostly Clear
Mostly clear, with a low around 50. Southeast wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Mostly Clear | 3 mph SE | 0% |
| Wednesday | 76°F | Mostly Sunny | 1 to 14 mph S | 0% |
| Wednesday Night | 62°F | Mostly Cloudy then Rain Showers | 10 mph S | 91% |
| Thursday | 76°F | Rain Showers | 5 to 9 mph S | 75% |
| Thursday Night | 57°F | Chance Rain Showers | 3 mph W | 42% |
| Friday | 70°F | Chance Rain Showers | 2 mph NW | 45% |
| Friday Night | 46°F | Chance Rain Showers then Partly Cloudy | 3 mph NW | 41% |
| Saturday | 63°F | Mostly Sunny | 3 to 12 mph NW | 12% |
| Saturday Night | 37°F | Partly Cloudy | 2 to 8 mph NW | 12% |
| Sunday | 61°F | Mostly Sunny | 2 to 8 mph W | 8% |
| Sunday Night | 35°F | Partly Cloudy then Slight Chance Rain Showers | 6 mph W | 21% |
| Monday | 60°F | Slight Chance Rain Showers | 6 to 15 mph NW | 22% |
| Monday Night | 34°F | Slight Chance Rain Showers | 7 mph W | 22% |
| Tuesday | 64°F | Sunny | 6 to 14 mph W | 8% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Greencastle, PA
Last spring frost
Apr 7
First fall frost
Nov 4
Growing season
209 days
Hardiness zone
7a
Explore more for Greencastle, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Hagerstown Washington Co Ap, Md (5.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.