Derry, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Derry, a borough in Westmoreland County, Pennsylvania.
Tonight
58°F
Partly Cloudy
Partly cloudy, with a low around 58. East wind around 5 mph.
7-day forecast for Derry
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Partly Cloudy | 5 mph E | 5% |
| Saturday | 78°F | Partly Sunny | 7 mph SE | 3% |
| Saturday Night | 64°F | Mostly Cloudy then Chance Showers And Thunderstorms | 6 to 14 mph SE | 54% |
| Sunday | 77°F | Showers And Thunderstorms | 7 to 10 mph SW | 95% |
| Sunday Night | 61°F | Showers And Thunderstorms | 8 mph N | 95% |
| Monday | 70°F | Chance Rain Showers | 10 mph NE | 43% |
| Monday Night | 58°F | Showers And Thunderstorms Likely | 12 to 16 mph E | 69% |
| Tuesday | 65°F | Showers And Thunderstorms Likely | 16 to 20 mph E | 73% |
| Tuesday Night | 54°F | Showers And Thunderstorms Likely | 18 to 22 mph E | 67% |
| Wednesday | 62°F | Showers And Thunderstorms Likely | 18 mph E | 64% |
| Wednesday Night | 54°F | Chance Showers And Thunderstorms | 12 to 20 mph E | 53% |
| Thursday | 64°F | Chance Showers And Thunderstorms | 12 mph E | 47% |
| Thursday Night | 53°F | Chance Rain Showers | 3 to 9 mph E | 29% |
| Friday | 70°F | Slight Chance Rain Showers | 3 to 8 mph N | 21% |
Forecast source: National Weather Service (api.weather.gov) for Derry (40.333, -79.301). Updated through the day.
Growing snapshot for Derry
Last spring frost
May 2
First fall frost
Oct 14
Growing season
163 days
Hardiness zone
6b
More local growing data for Derry: nearby ZIP 15627 weather · frost dates · planting calendar · Pennsylvania frost dates
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Level Green
Climate data from the nearest NOAA station, Loyalhanna Lake, Pa (10.7 mi from Derry). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.