Harmonsburg, PA Weather & Growing Conditions
This Afternoon
72°F
Mostly Sunny
Mostly sunny, with a high near 72. North wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Mostly Sunny | 9 mph N | 0% |
| Tonight | 55°F | Partly Cloudy | 3 to 9 mph NE | 1% |
| Saturday | 71°F | Partly Sunny then Slight Chance Rain Showers | 6 mph SE | 17% |
| Saturday Night | 61°F | Showers And Thunderstorms | 6 mph SE | 78% |
| Sunday | 69°F | Showers And Thunderstorms | 6 to 10 mph W | 82% |
| Sunday Night | 54°F | Chance Rain Showers | 7 to 10 mph NE | 46% |
| Monday | 65°F | Mostly Cloudy | 9 to 13 mph NE | 14% |
| Monday Night | 52°F | Chance Rain Showers | 9 to 13 mph NE | 42% |
| Tuesday | 64°F | Chance Rain Showers | 14 mph E | 42% |
| Tuesday Night | 52°F | Showers And Thunderstorms Likely | 16 mph E | 56% |
| Wednesday | 61°F | Rain Showers Likely | 15 mph E | 56% |
| Wednesday Night | 51°F | Showers And Thunderstorms Likely | 10 to 15 mph SE | 56% |
| Thursday | 64°F | Chance Rain Showers | 8 to 12 mph E | 48% |
| Thursday Night | 52°F | Chance Rain Showers | 3 to 8 mph NE | 25% |
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.