Harmonsburg, PA Weather & Growing Conditions
Overnight
55°F
Mostly Cloudy
Mostly cloudy, with a low around 55. East wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Mostly Cloudy | 5 mph E | 1% |
| Saturday | 72°F | Mostly Cloudy | 6 mph E | 11% |
| Saturday Night | 60°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 6 mph SE | 73% |
| Sunday | 69°F | Showers And Thunderstorms | 6 to 9 mph W | 84% |
| Sunday Night | 50°F | Chance Rain Showers then Mostly Cloudy | 9 mph NE | 27% |
| Monday | 64°F | Mostly Cloudy | 12 mph NE | 5% |
| Monday Night | 49°F | Chance Rain Showers | 10 mph NE | 40% |
| Tuesday | 62°F | Chance Rain Showers | 13 mph E | 40% |
| Tuesday Night | 49°F | Rain Showers Likely | 16 mph E | 56% |
| Wednesday | 61°F | Rain Showers Likely | 16 mph E | 56% |
| Wednesday Night | 49°F | Showers And Thunderstorms Likely | 12 to 15 mph SE | 58% |
| Thursday | 64°F | Showers And Thunderstorms Likely | 8 to 13 mph E | 55% |
| Thursday Night | 49°F | Slight Chance Rain Showers | 5 to 9 mph E | 21% |
| Friday | 67°F | Slight Chance Rain Showers | 5 to 10 mph NE | 21% |
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 Sep 19, 2026.