Climate almanac
St. Marys
Ontario, Canada · 43.25°, -81.13°
What is the weather like in St. Marys in May?
In May, St. Marys is typically 67°F (19°C) during the day and 47°F (9°C) at night. The month brings about 3.3 in (84 mm) of precipitation in total. Snowfall averages about 0.2 in (5 mm) over the month.
- Average high67°F (19°C)
- Average low47°F (9°C)
- Precipitation3.3 in (84 mm)
- Clear or mostly clear days9
- Snowfall0.2 in (5 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)