Arnold City, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Arnold City, a community in Washington County, Pennsylvania.
Overnight
52°F
Mostly Clear
Mostly clear, with a low around 52. Southeast wind around 2 mph.
7-day forecast for Arnold City
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Mostly Clear | 2 mph SE | 1% |
| Wednesday | 78°F | Partly Sunny | 1 to 8 mph S | 8% |
| Wednesday Night | 60°F | Light Rain | 9 mph S | 94% |
| Thursday | 70°F | Chance Light Rain then Partly Sunny | 7 to 13 mph SW | 48% |
| Thursday Night | 47°F | Partly Cloudy | 2 to 6 mph SW | 2% |
| Friday | 64°F | Partly Sunny then Slight Chance Light Rain | 3 to 8 mph SW | 20% |
| Friday Night | 41°F | Chance Light Rain | 3 to 7 mph W | 36% |
| Saturday | 53°F | Chance Light Rain | 7 to 13 mph W | 36% |
| Saturday Night | 35°F | Chance Light Rain | 6 to 9 mph W | 29% |
| Sunday | 55°F | Partly Sunny | 6 to 13 mph W | 8% |
| Sunday Night | 32°F | Partly Cloudy | 9 mph SW | 6% |
| Monday | 56°F | Mostly Sunny | 8 to 13 mph W | 11% |
| Monday Night | 33°F | Mostly Clear | 6 to 10 mph SW | 10% |
| Tuesday | 60°F | Sunny | 10 to 15 mph SW | 4% |
Forecast source: National Weather Service (api.weather.gov) for Arnold City (40.117, -79.823). Updated through the day.
Growing snapshot for Arnold City
Last spring frost
Apr 13
First fall frost
Nov 5
Growing season
205 days
Hardiness zone
6b
More local growing data for Arnold City: nearby ZIP 15412 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Charleroi Lock 4, Pa (4 mi from Arnold City). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.