Harwick, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harwick, a community in Allegheny County, Pennsylvania.
Today
79°F
Mostly Cloudy
Mostly cloudy, with a high near 79. East wind around 6 mph.
7-day forecast for Harwick
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 79°F | Mostly Cloudy | 6 mph E | 4% |
| Tonight | 64°F | Showers And Thunderstorms Likely | 6 mph SE | 65% |
| Sunday | 78°F | Showers And Thunderstorms | 6 to 10 mph SW | 96% |
| Sunday Night | 54°F | Showers And Thunderstorms | 10 mph N | 90% |
| Monday | 69°F | Chance Rain Showers | 13 mph NE | 35% |
| Monday Night | 52°F | Rain Showers Likely | 13 mph E | 61% |
| Tuesday | 64°F | Rain Showers Likely | 16 mph E | 61% |
| Tuesday Night | 50°F | Rain Showers Likely | 14 to 17 mph E | 61% |
| Wednesday | 62°F | Rain Showers Likely | 16 mph E | 61% |
| Wednesday Night | 50°F | Rain Showers Likely | 9 to 15 mph E | 60% |
| Thursday | 67°F | Rain Showers Likely | 12 mph E | 60% |
| Thursday Night | 49°F | Chance Showers And Thunderstorms | 5 to 12 mph NE | 27% |
| Friday | 70°F | Partly Sunny then Slight Chance Rain Showers | 9 mph NE | 16% |
| Friday Night | 49°F | Slight Chance Rain Showers then Partly Cloudy | 5 to 9 mph NE | 16% |
Forecast source: National Weather Service (api.weather.gov) for Harwick (40.556, -79.805). Updated through the day.
Growing snapshot for Harwick
Last spring frost
Apr 16
First fall frost
Nov 1
Growing season
197 days
Hardiness zone
6b
More local growing data for Harwick: nearby ZIP 15049 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Acmetonia Lock 3, Pa (1.5 mi from Harwick). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.