St. Marys, PA Weather & Growing Conditions
This Afternoon
75°F
Partly Sunny
Partly sunny. High near 75, with temperatures falling to around 68 in the afternoon. South wind around 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Partly Sunny | 7 mph S | 2% |
| Tonight | 58°F | Light Rain | 6 to 9 mph S | 100% |
| Thursday | 67°F | Rain Showers Likely then Partly Sunny | 7 to 10 mph SW | 67% |
| Thursday Night | 46°F | Mostly Cloudy | 6 mph SW | 0% |
| Friday | 59°F | Mostly Cloudy then Chance Rain Showers | 3 to 7 mph SW | 27% |
| Friday Night | 40°F | Chance Rain Showers | 6 mph W | 47% |
| Saturday | 47°F | Rain Showers Likely | 7 to 10 mph W | 58% |
| Saturday Night | 36°F | Rain Showers Likely | 12 mph W | 58% |
| Sunday | 52°F | Partly Sunny | 12 mph W | 4% |
| Sunday Night | 35°F | Partly Cloudy then Slight Chance Rain Showers | 13 mph W | 17% |
| Monday | 52°F | Slight Chance Rain Showers then Mostly Sunny | 9 to 13 mph W | 17% |
| Monday Night | 35°F | Partly Cloudy | 12 mph W | 5% |
| Tuesday | 57°F | Mostly Sunny | 12 mph W | 3% |
| Tuesday Night | 34°F | Partly Cloudy | 6 to 9 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for St. Marys, PA
Last spring frost
May 7
First fall frost
Oct 15
Growing season
160 days
Hardiness zone
6a
Explore more for St. Marys, PA: full frost dates · planting calendar · Pennsylvania frost dates
Climate data from the nearest NOAA station, Emporium, Pa (12.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 5, 2026.