Duncannon, PA Weather & Growing Conditions
Today
73°F
Mostly Sunny
Mostly sunny, with a high near 73. South wind 3 to 10 mph, with gusts as high as 21 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Mostly Sunny | 3 to 10 mph S | 1% |
| Tonight | 61°F | Mostly Cloudy then Light Rain Likely | 9 to 13 mph S | 74% |
| Thursday | 71°F | Light Rain | 5 to 13 mph S | 78% |
| Thursday Night | 55°F | Chance Light Rain | 2 to 6 mph W | 30% |
| Friday | 66°F | Slight Chance Light Rain | 2 mph NW | 18% |
| Friday Night | 47°F | Partly Cloudy | 2 to 7 mph NW | 13% |
| Saturday | 57°F | Mostly Sunny | 7 to 10 mph W | 13% |
| Saturday Night | 41°F | Partly Cloudy | 8 to 12 mph W | 13% |
| Sunday | 57°F | Mostly Sunny | 9 mph NW | 4% |
| Sunday Night | 39°F | Partly Cloudy | 7 mph W | 6% |
| Monday | 57°F | Sunny | 7 to 10 mph W | 6% |
| Monday Night | 37°F | Mostly Clear | 3 to 8 mph W | 4% |
| Tuesday | 61°F | Sunny | 5 to 9 mph W | 1% |
| Tuesday Night | 38°F | Mostly Clear | 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 (8.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.