Derry, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Derry, a borough in Westmoreland County, Pennsylvania.
Today
86°F
Sunny
Sunny, with a high near 86. Southeast wind 1 to 5 mph.
7-day forecast for Derry
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 1 to 5 mph SE | 0% |
| Tonight | 66°F | Partly Cloudy | 3 to 8 mph SE | 1% |
| Wednesday | 86°F | Partly Sunny then Scattered Showers And Thunderstorms | 6 mph SE | 31% |
| Wednesday Night | 68°F | Scattered Showers And Thunderstorms | 5 mph SE | 45% |
| Thursday | 86°F | Showers And Thunderstorms | 3 to 8 mph SW | 80% |
| Thursday Night | 68°F | Showers And Thunderstorms | 3 to 7 mph SW | 80% |
| Friday | 85°F | Showers And Thunderstorms | 5 to 8 mph SW | 83% |
| Friday Night | 67°F | Showers And Thunderstorms | 6 mph SW | 83% |
| Saturday | 83°F | Chance Showers And Thunderstorms | 6 to 9 mph SW | 53% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 7 mph SW | 53% |
| Sunday | 86°F | Chance Showers And Thunderstorms | 6 to 10 mph SW | 26% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 6 to 9 mph SW | 26% |
| Monday | 87°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 10 to 14 mph SW | 43% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 7 to 12 mph SW | 51% |
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 Aug 4, 2026.