St. Clair, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for St. Clair, a community in Blair County, Pennsylvania.
Overnight
52°F
Patchy Fog
Patchy fog. Partly cloudy, with a low around 52. North wind around 2 mph.
7-day forecast for St. Clair
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 52°F | Patchy Fog | 2 mph N | 0% |
| Saturday | 75°F | Patchy Fog then Partly Sunny | 1 to 5 mph E | 3% |
| Saturday Night | 62°F | Chance Rain Showers | 6 mph SE | 53% |
| Sunday | 77°F | Showers And Thunderstorms | 6 mph SW | 96% |
| Sunday Night | 55°F | Showers And Thunderstorms | 2 to 7 mph N | 96% |
| Monday | 68°F | Chance Rain Showers | 7 mph NE | 34% |
| Monday Night | 53°F | Rain Showers Likely | 7 mph E | 66% |
| Tuesday | 62°F | Showers And Thunderstorms Likely | 7 mph E | 72% |
| Tuesday Night | 48°F | Rain Showers Likely | 8 mph E | 65% |
| Wednesday | 59°F | Rain Showers Likely | 8 mph E | 60% |
| Wednesday Night | 49°F | Showers And Thunderstorms Likely | 6 mph E | 56% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 5 mph NE | 51% |
| Thursday Night | 49°F | Chance Rain Showers | 3 mph NE | 35% |
| Friday | 69°F | Slight Chance Rain Showers then Partly Sunny | 1 to 5 mph N | 22% |
Forecast source: National Weather Service (api.weather.gov) for St. Clair (40.478, -78.228). Updated through the day.
Growing snapshot for St. Clair
Last spring frost
Apr 19
First fall frost
Oct 28
Growing season
191 days
Hardiness zone
6b
More local growing data for St. Clair: nearby ZIP 16693 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
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East Altoona
East Freedom
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Climate data from the nearest NOAA station, Raystown Lake 2, Pa (9.8 mi from St. Clair). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.