Derry, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Derry, a borough in Westmoreland County, Pennsylvania.
This Afternoon
78°F
Sunny
Sunny. High near 78, with temperatures falling to around 72 in the afternoon. South wind around 2 mph.
7-day forecast for Derry
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Sunny | 2 mph S | 1% |
| Tonight | 52°F | Mostly Clear | 7 mph SE | 2% |
| Wednesday | 77°F | Partly Sunny | 5 to 10 mph SE | 2% |
| Wednesday Night | 61°F | Light Rain | 8 to 12 mph S | 99% |
| Thursday | 70°F | Light Rain Likely | 8 to 14 mph SW | 60% |
| Thursday Night | 52°F | Mostly Cloudy then Slight Chance Light Rain | 2 to 6 mph SW | 15% |
| Friday | 65°F | Slight Chance Light Rain | 1 to 7 mph W | 20% |
| Friday Night | 46°F | Chance Light Rain | 1 to 5 mph NW | 38% |
| Saturday | 55°F | Chance Light Rain | 6 to 14 mph W | 38% |
| Saturday Night | 39°F | Chance Light Rain | 3 to 9 mph W | 31% |
| Sunday | 55°F | Slight Chance Light Rain | 5 to 14 mph SW | 20% |
| Sunday Night | 38°F | Chance Light Rain | 13 mph W | 26% |
| Monday | 55°F | Chance Light Rain | 13 to 20 mph W | 34% |
| Monday Night | 38°F | Chance Light Rain | 12 to 16 mph SW | 34% |
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 Nov 4, 2026.