Harrison City, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harrison City, a community in Westmoreland County, Pennsylvania.
This Afternoon
77°F
Sunny
Sunny, with a high near 77. South wind 0 to 5 mph.
7-day forecast for Harrison City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Sunny | 0 to 5 mph S | 1% |
| Tonight | 51°F | Mostly Clear | 6 mph SE | 2% |
| Wednesday | 78°F | Partly Sunny | 2 to 9 mph SE | 5% |
| Wednesday Night | 60°F | Light Rain | 9 mph S | 99% |
| Thursday | 71°F | Chance Light Rain | 8 to 15 mph SW | 52% |
| Thursday Night | 49°F | Partly Cloudy | 1 to 7 mph SW | 9% |
| Friday | 66°F | Partly Sunny | 1 to 8 mph W | 13% |
| Friday Night | 44°F | Chance Light Rain | 3 to 7 mph NW | 28% |
| Saturday | 56°F | Chance Light Rain | 7 to 14 mph W | 30% |
| Saturday Night | 36°F | Slight Chance Light Rain then Mostly Cloudy | 5 to 10 mph W | 24% |
| Sunday | 55°F | Partly Sunny then Slight Chance Light Rain | 5 to 14 mph SW | 18% |
| Sunday Night | 35°F | Slight Chance Light Rain | 9 to 13 mph W | 23% |
| Monday | 56°F | Chance Light Rain | 13 to 20 mph W | 32% |
| Monday Night | 35°F | Chance Light Rain | 12 to 16 mph SW | 32% |
Forecast source: National Weather Service (api.weather.gov) for Harrison City (40.355, -79.650). Updated through the day.
Growing snapshot for Harrison City
Last spring frost
Apr 22
First fall frost
Oct 25
Growing season
186 days
Hardiness zone
6b
More local growing data for Harrison City: nearby ZIP 15636 weather · frost dates · planting calendar · Pennsylvania frost dates
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Level Green
Climate data from the nearest NOAA station, Murrysville 2 Sw, Pa (4.8 mi from Harrison City). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.