Pen Mar, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Pen Mar, a community in Franklin County, Pennsylvania.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. East wind around 5 mph.
7-day forecast for Pen Mar
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 mph E | 0% |
| Tonight | 66°F | Mostly Cloudy then Patchy Fog | 1 to 5 mph E | 17% |
| Wednesday | 83°F | Showers And Thunderstorms Likely | 2 to 6 mph SE | 65% |
| Wednesday Night | 68°F | Chance Showers And Thunderstorms | 5 mph S | 60% |
| Thursday | 87°F | Partly Sunny then Showers And Thunderstorms Likely | 7 mph S | 59% |
| Thursday Night | 69°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 2 to 6 mph SW | 59% |
| Friday | 87°F | Partly Sunny then Chance Showers And Thunderstorms | 1 to 6 mph SW | 53% |
| Friday Night | 67°F | Chance Showers And Thunderstorms | 5 mph SW | 53% |
| Saturday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 2 to 6 mph W | 41% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 5 mph SW | 41% |
| Sunday | 87°F | Mostly Sunny | 2 to 6 mph W | 13% |
| Sunday Night | 69°F | Partly Cloudy | 6 mph SW | 13% |
| Monday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 9 mph W | 15% |
| Monday Night | 68°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 to 8 mph W | 15% |
Forecast source: National Weather Service (api.weather.gov) for Pen Mar (39.726, -77.516). Updated through the day.
Growing snapshot for Pen Mar
Last spring frost
Apr 25
First fall frost
Oct 19
Growing season
176 days
More local growing data for Pen Mar: nearby ZIP 17250 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Blue Ridge Summit
Chambersburg
Fayetteville
Fort Loudon
Greencastle
Guilford
Marion
Mercersburg
Mont Alto
Orrstown
Rouzerville
Scotland
State Line
Wayne Heights
Waynesboro
Climate data from the nearest NOAA station, Smithsburg 2Nw, Md (6 mi from Pen Mar). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.