Penn, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Penn, a borough in Westmoreland County, Pennsylvania.
Today
78°F
Partly Sunny
Partly sunny, with a high near 78. East wind around 6 mph.
7-day forecast for Penn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Partly Sunny | 6 mph E | 3% |
| Tonight | 64°F | Chance Rain Showers | 8 mph SE | 45% |
| Sunday | 77°F | Showers And Thunderstorms | 8 to 13 mph SW | 97% |
| Sunday Night | 54°F | Showers And Thunderstorms | 12 mph N | 92% |
| Monday | 68°F | Chance Rain Showers | 14 mph NE | 40% |
| Monday Night | 53°F | Showers And Thunderstorms Likely | 14 mph E | 68% |
| Tuesday | 63°F | Showers And Thunderstorms Likely | 14 to 18 mph E | 68% |
| Tuesday Night | 50°F | Rain Showers Likely | 16 to 20 mph E | 60% |
| Wednesday | 61°F | Rain Showers Likely | 18 mph E | 60% |
| Wednesday Night | 50°F | Showers And Thunderstorms Likely | 10 to 17 mph E | 56% |
| Thursday | 66°F | Chance Rain Showers | 13 mph E | 54% |
| Thursday Night | 49°F | Chance Showers And Thunderstorms | 5 to 13 mph NE | 30% |
| Friday | 68°F | Partly Sunny then Slight Chance Rain Showers | 6 to 10 mph NE | 19% |
| Friday Night | 48°F | Slight Chance Rain Showers then Partly Cloudy | 5 to 10 mph NE | 19% |
Forecast source: National Weather Service (api.weather.gov) for Penn (40.329, -79.642). Updated through the day.
Growing snapshot for Penn
Last spring frost
Apr 22
First fall frost
Oct 25
Growing season
186 days
Hardiness zone
6b
More local growing data for Penn: nearby ZIP 15675 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Murrysville 2 Sw, Pa (7 mi from Penn). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.