Port Royal, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Port Royal, a borough in Juniata County, Pennsylvania.
Today
75°F
Patchy Fog then Mostly Sunny
Patchy fog before 10am. Mostly sunny, with a high near 75. Southeast wind 0 to 6 mph.
7-day forecast for Port Royal
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Patchy Fog then Mostly Sunny | 0 to 6 mph SE | 1% |
| Tonight | 59°F | Light Rain | 3 mph SE | 92% |
| Thursday | 74°F | Light Rain | 1 to 6 mph SW | 84% |
| Thursday Night | 51°F | Chance Light Rain then Mostly Cloudy | 1 mph NW | 27% |
| Friday | 68°F | Partly Sunny | 1 mph NW | 14% |
| Friday Night | 44°F | Partly Cloudy | 1 mph NW | 10% |
| Saturday | 59°F | Slight Chance Light Rain | 2 to 7 mph W | 18% |
| Saturday Night | 37°F | Mostly Cloudy | 6 mph W | 13% |
| Sunday | 59°F | Mostly Sunny | 3 to 7 mph NW | 5% |
| Sunday Night | 35°F | Partly Cloudy | 5 mph W | 7% |
| Monday | 58°F | Mostly Sunny | 3 to 9 mph W | 7% |
| Monday Night | 34°F | Mostly Clear | 1 to 5 mph W | 3% |
| Tuesday | 63°F | Mostly Sunny | 2 to 8 mph W | 2% |
| Tuesday Night | 34°F | Mostly Clear | 3 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Port Royal (40.534, -77.389). Updated through the day.
Growing snapshot for Port Royal
Last spring frost
Apr 21
First fall frost
Oct 24
Growing season
185 days
Hardiness zone
7a
More local growing data for Port Royal: nearby ZIP 17056 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Lewistown, Pa (11.8 mi from Port Royal). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.