Harleysville, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harleysville, a community in Montgomery County, Pennsylvania.
Overnight
47°F
Patchy Fog
Patchy fog after 3am. Mostly clear, with a low around 47. Southeast wind 0 to 5 mph.
7-day forecast for Harleysville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 47°F | Patchy Fog | 0 to 5 mph SE | 2% |
| Wednesday | 74°F | Patchy Fog then Sunny | 0 to 10 mph S | 3% |
| Wednesday Night | 57°F | Mostly Cloudy | 5 mph S | 7% |
| Thursday | 72°F | Light Rain Likely | 5 to 10 mph S | 58% |
| Thursday Night | 60°F | Light Rain Likely | 0 to 5 mph SW | 72% |
| Friday | 69°F | Light Rain Likely | 0 to 5 mph W | 72% |
| Friday Night | 49°F | Light Rain Likely | 0 to 5 mph NW | 71% |
| Saturday | 64°F | Chance Light Rain | 5 to 10 mph NW | 28% |
| Saturday Night | 38°F | Slight Chance Light Rain then Partly Cloudy | 5 mph NW | 16% |
| Sunday | 60°F | Mostly Sunny | 5 to 10 mph W | 10% |
| Sunday Night | 36°F | Slight Chance Light Rain | 5 mph W | 19% |
| Monday | 59°F | Slight Chance Light Rain | 5 to 15 mph NW | 23% |
| Monday Night | 34°F | Slight Chance Light Rain | 5 to 10 mph W | 22% |
| Tuesday | 61°F | Slight Chance Light Rain then Sunny | 5 to 15 mph W | 15% |
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 Nov 4, 2026.