Harleysville, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harleysville, a community in Montgomery County, Pennsylvania.
Overnight
55°F
Partly Cloudy
Partly cloudy, with a low around 55. Northeast wind around 5 mph.
7-day forecast for Harleysville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Partly Cloudy | 5 mph NE | 0% |
| Saturday | 74°F | Partly Sunny | 5 to 10 mph NE | 2% |
| Saturday Night | 57°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 10 mph E | 20% |
| Sunday | 73°F | Rain Showers Likely then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 66% |
| Sunday Night | 56°F | Showers And Thunderstorms | 5 to 10 mph W | 86% |
| Monday | 68°F | Slight Chance Rain Showers | 5 to 10 mph NE | 23% |
| Monday Night | 49°F | Chance Rain Showers | 5 to 10 mph NE | 34% |
| Tuesday | 62°F | Chance Rain Showers | 10 to 15 mph NE | 40% |
| Tuesday Night | 48°F | Chance Rain Showers | 10 to 15 mph NE | 36% |
| Wednesday | 62°F | Chance Rain Showers | 15 mph NE | 30% |
| Wednesday Night | 48°F | Chance Rain Showers | 15 mph NE | 32% |
| Thursday | 62°F | Chance Rain Showers | 15 mph NE | 33% |
| Thursday Night | 48°F | Chance Rain Showers | 10 to 15 mph NE | 33% |
| Friday | 65°F | Chance Rain Showers | 10 to 15 mph N | 26% |
Forecast source: National Weather Service (api.weather.gov) for Harleysville (40.278, -75.388). Updated through the day.
Growing snapshot for Harleysville
Last spring frost
Apr 24
First fall frost
Oct 15
Growing season
173 days
Hardiness zone
7a
More local growing data for Harleysville: nearby ZIP 19438 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Graterford 1 E, Pa (3.3 mi from Harleysville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.