Duncannon, PA Weather & Growing Conditions
This Afternoon
74°F
Mostly Sunny
Mostly sunny, with a high near 74. Southeast wind around 9 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Mostly Sunny | 9 mph SE | 1% |
| Tonight | 59°F | Mostly Cloudy then Light Rain | 5 to 8 mph SE | 75% |
| Thursday | 73°F | Light Rain | 3 to 8 mph S | 80% |
| Thursday Night | 53°F | Chance Light Rain | 0 to 3 mph SW | 29% |
| Friday | 68°F | Slight Chance Light Rain | 2 mph N | 16% |
| Friday Night | 45°F | Partly Cloudy | 2 mph NW | 12% |
| Saturday | 59°F | Mostly Sunny | 2 to 9 mph W | 14% |
| Saturday Night | 38°F | Partly Cloudy | 5 to 8 mph W | 13% |
| Sunday | 59°F | Mostly Sunny | 8 mph NW | 4% |
| Sunday Night | 36°F | Partly Cloudy | 6 mph W | 5% |
| Monday | 58°F | Mostly Sunny | 5 to 10 mph W | 5% |
| Monday Night | 35°F | Mostly Clear | 2 to 7 mph W | 4% |
| Tuesday | 63°F | Mostly Sunny | 2 to 9 mph W | 1% |
| Tuesday Night | 36°F | Mostly Clear | 2 to 6 mph W | 0% |
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 (12.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.