Donegal, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Donegal, a borough in Westmoreland County, Pennsylvania.
This Afternoon
74°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny, with a high near 74. North wind around 7 mph. Chance of precipitation is 20%.
7-day forecast for Donegal
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Slight Chance Rain Showers | 7 mph N | 23% |
| Tonight | 55°F | Partly Cloudy then Patchy Fog | 0 to 6 mph NE | 14% |
| Saturday | 76°F | Partly Sunny | 6 mph SE | 2% |
| Saturday Night | 62°F | Partly Cloudy then Chance Rain Showers | 5 to 9 mph SE | 49% |
| Sunday | 76°F | Showers And Thunderstorms | 5 to 8 mph SW | 95% |
| Sunday Night | 59°F | Showers And Thunderstorms | 5 mph N | 95% |
| Monday | 69°F | Chance Rain Showers | 5 to 8 mph E | 46% |
| Monday Night | 55°F | Showers And Thunderstorms Likely | 9 to 13 mph E | 70% |
| Tuesday | 64°F | Showers And Thunderstorms Likely | 13 to 17 mph SE | 73% |
| Tuesday Night | 51°F | Showers And Thunderstorms Likely | 18 mph E | 70% |
| Wednesday | 61°F | Showers And Thunderstorms Likely | 17 mph SE | 65% |
| Wednesday Night | 50°F | Chance Showers And Thunderstorms | 12 to 17 mph SE | 54% |
| Thursday | 63°F | Chance Rain Showers | 7 to 10 mph E | 48% |
| Thursday Night | 50°F | Chance Rain Showers | 2 to 7 mph E | 32% |
Forecast source: National Weather Service (api.weather.gov) for Donegal (40.112, -79.381). Updated through the day.
Growing snapshot for Donegal
Last spring frost
Apr 30
First fall frost
Oct 17
Growing season
170 days
Hardiness zone
6a
More local growing data for Donegal: nearby ZIP 15628 weather · frost dates · planting calendar · Pennsylvania frost dates
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Level Green
Climate data from the nearest NOAA station, Donegal 2 Nw, Pa (2.7 mi from Donegal). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.