Duncannon, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Duncannon, a borough in Perry County, Pennsylvania.
Today
85°F
Patchy Fog then Sunny
Patchy fog before 9am. Sunny, with a high near 85. East wind 0 to 3 mph.
7-day forecast for Duncannon
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Patchy Fog then Sunny | 0 to 3 mph E | 0% |
| Tonight | 65°F | Mostly Cloudy then Patchy Fog | 0 to 3 mph E | 6% |
| Wednesday | 83°F | Chance Rain Showers | 3 mph E | 32% |
| Wednesday Night | 70°F | Showers And Thunderstorms Likely | 0 to 3 mph SE | 61% |
| Thursday | 89°F | Patchy Fog then Showers And Thunderstorms Likely | 1 to 5 mph S | 68% |
| Thursday Night | 70°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 3 mph S | 68% |
| Friday | 88°F | Partly Sunny then Showers And Thunderstorms Likely | 0 to 3 mph W | 66% |
| Friday Night | 69°F | Showers And Thunderstorms Likely | 2 mph W | 66% |
| Saturday | 86°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 48% |
| Saturday Night | 68°F | Chance Showers And Thunderstorms | 0 to 3 mph W | 48% |
| Sunday | 88°F | Mostly Sunny | 0 to 5 mph W | 11% |
| Sunday Night | 70°F | Partly Cloudy | 0 to 3 mph SW | 11% |
| Monday | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 7 mph W | 20% |
| Monday Night | 69°F | Slight Chance Showers And Thunderstorms | 1 to 6 mph W | 20% |
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 Aug 4, 2026.