Duncannon, PA Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. East wind 0 to 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 0 to 3 mph E | 0% |
| Tonight | 66°F | Mostly Cloudy | 0 to 3 mph E | 6% |
| Wednesday | 82°F | Chance Rain Showers | 3 mph E | 31% |
| Wednesday Night | 70°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 to 3 mph SE | 60% |
| Thursday | 87°F | Patchy Fog then Showers And Thunderstorms Likely | 1 to 5 mph S | 68% |
| Thursday Night | 72°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 3 mph SW | 68% |
| Friday | 87°F | Partly Sunny then Showers And Thunderstorms Likely | 0 to 3 mph SW | 66% |
| Friday Night | 69°F | Showers And Thunderstorms Likely | 2 mph NW | 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 | 89°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). 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 Aug 4, 2026.