St. Marys, PA Weather & Growing Conditions
Today
81°F
Sunny
Sunny, with a high near 81. Southeast wind around 3 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 81°F | Sunny | 3 mph SE | 0% |
| Tonight | 58°F | Mostly Clear | 3 mph SE | 0% |
| Wednesday | 79°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 2 to 6 mph SE | 22% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms | 5 mph SE | 50% |
| Thursday | 80°F | Showers And Thunderstorms | 2 to 6 mph SW | 85% |
| Thursday Night | 67°F | Showers And Thunderstorms | 5 mph SW | 85% |
| Friday | 79°F | Showers And Thunderstorms | 2 to 6 mph SW | 80% |
| Friday Night | 64°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph SW | 80% |
| Saturday | 80°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 3 to 7 mph SW | 44% |
| Saturday Night | 63°F | Chance Showers And Thunderstorms | 5 mph SW | 44% |
| Sunday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 7 mph SW | 16% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms | 7 mph SW | 20% |
| Monday | 82°F | Chance Showers And Thunderstorms | 9 mph W | 39% |
| Monday Night | 63°F | Chance Showers And Thunderstorms | 5 to 8 mph W | 39% |
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 Aug 4, 2026.