Johnstown, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Johnstown, a city in Cambria County, Pennsylvania.
This Afternoon
74°F
Sunny
Sunny, with a high near 74. South wind 2 to 6 mph.
7-day forecast for Johnstown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 74°F | Sunny | 2 to 6 mph S | 1% |
| Tonight | 49°F | Mostly Clear | 5 mph SE | 2% |
| Wednesday | 74°F | Partly Sunny | 2 to 9 mph SE | 2% |
| Wednesday Night | 59°F | Rain Showers | 5 to 9 mph S | 99% |
| Thursday | 69°F | Rain Showers Likely | 3 to 9 mph SW | 67% |
| Thursday Night | 49°F | Mostly Cloudy then Slight Chance Rain Showers | 0 to 5 mph W | 17% |
| Friday | 64°F | Slight Chance Rain Showers | 0 to 5 mph NW | 23% |
| Friday Night | 43°F | Chance Rain Showers | 2 mph NW | 33% |
| Saturday | 53°F | Chance Rain Showers | 3 to 10 mph W | 34% |
| Saturday Night | 36°F | Chance Rain Showers | 3 to 7 mph W | 34% |
| Sunday | 53°F | Slight Chance Rain Showers | 3 to 10 mph W | 22% |
| Sunday Night | 34°F | Slight Chance Rain Showers | 8 mph W | 23% |
| Monday | 52°F | Chance Rain Showers | 8 to 15 mph W | 33% |
| Monday Night | 35°F | Chance Rain Showers | 9 mph W | 33% |
Forecast source: National Weather Service (api.weather.gov) for Johnstown (40.326, -78.919). Updated through the day.
Growing snapshot for Johnstown
Last spring frost
Apr 29
First fall frost
Oct 21
Growing season
176 days
Hardiness zone
6b
More local growing data for Johnstown: nearby ZIP 15901 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Johnstown Cambria Co Ap, Pa (4.2 mi from Johnstown). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.