Duncannon, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Duncannon, a borough in Perry County, Pennsylvania.
This Afternoon
75°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny, with a high near 75. Southeast wind around 3 mph. Chance of precipitation is 20%.
7-day forecast for Duncannon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Slight Chance Rain Showers | 3 mph SE | 15% |
| Tonight | 62°F | Rain Showers | 3 to 9 mph SE | 79% |
| Sunday | 78°F | Rain Showers | 3 to 9 mph S | 92% |
| Sunday Night | 55°F | Showers And Thunderstorms Likely then Mostly Cloudy | 3 to 9 mph NW | 74% |
| Monday | 70°F | Partly Sunny then Chance Rain Showers | 8 mph N | 29% |
| Monday Night | 52°F | Rain Showers Likely | 3 to 7 mph NE | 59% |
| Tuesday | 63°F | Rain Showers Likely | 7 mph NE | 59% |
| Tuesday Night | 50°F | Chance Rain Showers | 8 mph E | 46% |
| Wednesday | 61°F | Chance Rain Showers | 8 mph E | 38% |
| Wednesday Night | 49°F | Chance Rain Showers | 8 mph NE | 30% |
| Thursday | 62°F | Slight Chance Rain Showers | 8 mph NE | 22% |
| Thursday Night | 49°F | Slight Chance Rain Showers | 2 to 6 mph NE | 20% |
| Friday | 67°F | Slight Chance Rain Showers | 5 to 8 mph N | 24% |
| Friday Night | 50°F | Slight Chance Rain Showers | 5 to 9 mph N | 24% |
Forecast source: National Weather Service (api.weather.gov) for Duncannon (40.395, -77.028). Updated through the day.
Growing snapshot for Duncannon
Last spring frost
Apr 15
First fall frost
Oct 23
Growing season
189 days
Hardiness zone
7a
More local growing data for Duncannon: nearby ZIP 17020 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Harrisburg 1 Ne, Pa (12.8 mi from Duncannon). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.