Penn, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Penn, a borough in Westmoreland County, Pennsylvania.
This Afternoon
77°F
Sunny
Sunny. High near 77, with temperatures falling to around 71 in the afternoon. Southwest wind around 6 mph.
7-day forecast for Penn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Sunny | 6 mph SW | 1% |
| Tonight | 51°F | Mostly Clear | 6 mph SE | 2% |
| Wednesday | 78°F | Partly Sunny | 2 to 9 mph SE | 6% |
| Wednesday Night | 60°F | Light Rain | 9 mph S | 99% |
| Thursday | 71°F | Chance Light Rain | 8 to 15 mph SW | 52% |
| Thursday Night | 49°F | Partly Cloudy | 1 to 7 mph SW | 10% |
| Friday | 66°F | Partly Sunny | 1 to 8 mph W | 13% |
| Friday Night | 44°F | Chance Light Rain | 2 to 7 mph NW | 29% |
| Saturday | 56°F | Chance Light Rain | 7 to 14 mph W | 30% |
| Saturday Night | 36°F | Slight Chance Light Rain | 3 to 10 mph W | 24% |
| Sunday | 55°F | Partly Sunny then Slight Chance Light Rain | 5 to 14 mph SW | 18% |
| Sunday Night | 35°F | Slight Chance Light Rain | 9 to 13 mph W | 23% |
| Monday | 56°F | Chance Light Rain | 13 to 20 mph W | 32% |
| Monday Night | 35°F | Chance Light Rain | 12 to 16 mph SW | 32% |
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 Nov 3, 2026.