Duncannon, PA Weather & Growing Conditions
Overnight
53°F
Mostly Clear
Mostly clear, with a low around 53. North wind 6 to 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Mostly Clear | 6 to 9 mph N | 0% |
| Saturday | 73°F | Mostly Sunny | 6 mph E | 3% |
| Saturday Night | 62°F | Mostly Cloudy then Rain Showers Likely | 3 to 14 mph SE | 55% |
| Sunday | 73°F | Rain Showers | 5 to 13 mph S | 97% |
| Sunday Night | 59°F | Showers And Thunderstorms | 3 to 13 mph NW | 97% |
| Monday | 67°F | Chance Rain Showers | 6 to 12 mph N | 34% |
| Monday Night | 55°F | Rain Showers Likely | 6 to 9 mph NE | 55% |
| Tuesday | 60°F | Rain Showers Likely | 9 mph E | 63% |
| Tuesday Night | 51°F | Rain Showers Likely | 10 mph NE | 63% |
| Wednesday | 57°F | Chance Rain Showers | 7 to 10 mph NE | 52% |
| Wednesday Night | 51°F | Chance Showers And Thunderstorms | 8 mph NE | 52% |
| Thursday | 60°F | Chance Showers And Thunderstorms | 8 mph NE | 45% |
| Thursday Night | 51°F | Chance Showers And Thunderstorms | 6 mph N | 39% |
| Friday | 65°F | Slight Chance Rain Showers then Partly Sunny | 7 mph N | 24% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Duncannon, PA
Last spring frost
Apr 15
First fall frost
Oct 23
Growing season
189 days
Hardiness zone
7a
Explore more for Duncannon, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Harrisburg 1 Ne, Pa (8.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.