Arnold, PA Weather & Growing Conditions
Tonight
51°F
Mostly Clear
Mostly clear, with a low around 51. South wind 0 to 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 51°F | Mostly Clear | 0 to 3 mph S | 1% |
| Wednesday | 77°F | Partly Sunny | 2 to 9 mph S | 8% |
| Wednesday Night | 60°F | Light Rain | 9 mph S | 92% |
| Thursday | 69°F | Chance Light Rain then Partly Sunny | 7 to 13 mph SW | 41% |
| Thursday Night | 46°F | Partly Cloudy | 2 to 6 mph SW | 1% |
| Friday | 63°F | Partly Sunny then Slight Chance Light Rain | 2 to 8 mph SW | 19% |
| Friday Night | 41°F | Chance Light Rain | 5 to 8 mph W | 35% |
| Saturday | 56°F | Chance Light Rain | 7 to 13 mph W | 30% |
| Saturday Night | 37°F | Chance Light Rain then Mostly Cloudy | 3 to 9 mph W | 25% |
| Sunday | 55°F | Partly Sunny then Slight Chance Light Rain | 5 to 12 mph SW | 17% |
| Sunday Night | 36°F | Slight Chance Light Rain | 10 mph W | 21% |
| Monday | 56°F | Chance Light Rain | 10 to 16 mph W | 31% |
| Monday Night | 36°F | Chance Light Rain then Partly Cloudy | 8 to 13 mph SW | 31% |
| Tuesday | 60°F | Mostly Sunny | 13 to 18 mph SW | 10% |
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 Nov 4, 2026.