Arnold, PA Weather & Growing Conditions
Today
86°F
Patchy Fog then Sunny
Patchy fog before 8am. Sunny, with a high near 86. East wind 0 to 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Patchy Fog then Sunny | 0 to 3 mph E | 0% |
| Tonight | 66°F | Mostly Clear | 5 mph E | 1% |
| Wednesday | 87°F | Mostly Sunny then Scattered Showers And Thunderstorms | 1 to 6 mph SE | 30% |
| Wednesday Night | 68°F | Scattered Showers And Thunderstorms | 5 mph SE | 50% |
| Thursday | 86°F | Showers And Thunderstorms Likely | 2 to 7 mph SW | 72% |
| Thursday Night | 68°F | Showers And Thunderstorms Likely | 2 to 6 mph SW | 72% |
| Friday | 85°F | Showers And Thunderstorms | 3 to 8 mph SW | 81% |
| Friday Night | 67°F | Showers And Thunderstorms | 2 to 7 mph SW | 81% |
| Saturday | 84°F | Showers And Thunderstorms Likely | 5 to 8 mph SW | 56% |
| Saturday Night | 67°F | Showers And Thunderstorms Likely | 3 to 7 mph SW | 56% |
| Sunday | 87°F | Slight Chance Showers And Thunderstorms | 3 to 9 mph SW | 23% |
| Sunday Night | 69°F | Slight Chance Showers And Thunderstorms | 5 to 9 mph SW | 23% |
| Monday | 88°F | Chance Rain Showers then Chance Showers And Thunderstorms | 7 to 12 mph SW | 41% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 5 to 9 mph SW | 49% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Arnold, PA
Last spring frost
Apr 16
First fall frost
Nov 2
Growing season
199 days
Hardiness zone
6b
Explore more for Arnold, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Natrona Lock 4, Pa (3.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.