Harmonsburg, PA Weather & Growing Conditions
Overnight
57°F
Mostly Clear
Mostly clear, with a low around 57. South wind around 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 57°F | Mostly Clear | 10 mph S | 1% |
| Wednesday | 73°F | Partly Sunny then Light Rain Likely | 13 mph S | 58% |
| Wednesday Night | 56°F | Light Rain | 9 to 15 mph S | 98% |
| Thursday | 65°F | Partly Sunny | 8 to 14 mph SW | 7% |
| Thursday Night | 46°F | Mostly Cloudy | 3 to 8 mph SW | 13% |
| Friday | 58°F | Chance Rain Showers | 3 to 7 mph SW | 50% |
| Friday Night | 41°F | Rain Showers | 3 to 8 mph W | 77% |
| Saturday | 50°F | Rain Showers Likely | 8 to 12 mph W | 67% |
| Saturday Night | 36°F | Chance Light Rain | 6 to 9 mph W | 56% |
| Sunday | 52°F | Slight Chance Light Rain then Partly Sunny | 7 to 13 mph W | 15% |
| Sunday Night | 35°F | Slight Chance Light Rain | 6 to 9 mph W | 19% |
| Monday | 53°F | Slight Chance Light Rain | 7 to 12 mph W | 22% |
| Monday Night | 36°F | Slight Chance Light Rain then Partly Cloudy | 5 to 8 mph SW | 16% |
| Tuesday | 58°F | Mostly Sunny then Slight Chance Light Rain | 8 to 14 mph SW | 15% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Harmonsburg, PA
Last spring frost
Apr 30
First fall frost
Oct 23
Growing season
175 days
Hardiness zone
6a
Explore more for Harmonsburg, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Port Meadville Ap, Pa (5.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.