Duncannon, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Duncannon, a borough in Perry County, Pennsylvania.
Today
75°F
Patchy Fog then Mostly Sunny
Patchy fog before 9am. Mostly sunny, with a high near 75. Southeast wind 0 to 9 mph.
7-day forecast for Duncannon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Patchy Fog then Mostly Sunny | 0 to 9 mph SE | 1% |
| Tonight | 60°F | Mostly Cloudy then Light Rain | 7 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 | 69°F | Slight Chance Light Rain | 2 mph N | 17% |
| Friday Night | 45°F | Partly Cloudy | 2 mph NW | 13% |
| Saturday | 60°F | Mostly Sunny | 3 to 9 mph NW | 14% |
| Saturday Night | 38°F | Partly Cloudy | 5 to 9 mph W | 13% |
| Sunday | 59°F | Mostly Sunny | 5 to 8 mph NW | 5% |
| 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 | 1 to 7 mph W | 4% |
| Tuesday | 63°F | Sunny | 3 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) 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 Nov 4, 2026.