Johnstown, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Johnstown, a city in Cambria County, Pennsylvania.
Overnight
53°F
Patchy Fog
Patchy fog. Partly cloudy, with a low around 53. Northeast wind around 2 mph.
7-day forecast for Johnstown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 53°F | Patchy Fog | 2 mph NE | 1% |
| Saturday | 73°F | Patchy Fog then Partly Sunny | 2 to 7 mph E | 3% |
| Saturday Night | 62°F | Mostly Cloudy then Chance Rain Showers | 5 to 8 mph SE | 52% |
| Sunday | 75°F | Showers And Thunderstorms | 3 to 7 mph SW | 95% |
| Sunday Night | 56°F | Showers And Thunderstorms | 5 mph N | 95% |
| Monday | 66°F | Chance Rain Showers | 3 to 8 mph E | 41% |
| Monday Night | 54°F | Showers And Thunderstorms Likely | 10 mph E | 71% |
| Tuesday | 61°F | Showers And Thunderstorms Likely | 9 to 13 mph E | 74% |
| Tuesday Night | 50°F | Showers And Thunderstorms Likely | 14 mph E | 68% |
| Wednesday | 60°F | Showers And Thunderstorms Likely | 12 mph E | 65% |
| Wednesday Night | 49°F | Showers And Thunderstorms Likely | 8 to 12 mph E | 55% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 8 mph E | 48% |
| Thursday Night | 49°F | Chance Rain Showers | 2 to 7 mph E | 31% |
| Friday | 67°F | Slight Chance Rain Showers | 2 to 7 mph NE | 20% |
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 Sep 19, 2026.