September is a popular month to ask about Cavendish Beach because conditions can shift week to week along this coast. Expect the water near 15.0°C, with daily variation from wind, tides and recent storms. We refresh the live value from Open-Meteo Marine every hour, so the headline above always reflects the current state of the Gulf of St Lawrence.
Cavendish Beach sea temperature in September — averages 15.0°C
The sea at Cavendish Beach in Canada averages 15.0°C during September, based on long-run climatology for the Gulf of St Lawrence. Use the live reading below for today's actual water and the monthly grid to compare with the rest of the year.
Average sea · September
15.0°C
mild · Fair
Live water now
…
Recommended wetsuit
4/3mm fullsuit
At 15.0°C you need a 4/3mm fullsuit, and many surfers add neoprene boots.
Monthly comparison
Cool — short dips or a shorty wetsuit · Cavendish Beach
Can you swim at Cavendish Beach in July? — 16.0°C water16.0°CCan you swim at Cavendish Beach in August? — 17.0°C water17.0°CCan you swim at Cavendish Beach in September? — 15.0°C water15.0°CCan you swim at Cavendish Beach in October? — 11.0°C water11.0°CCan you swim at Cavendish Beach in November? — 8.0°C water8.0°CCan you swim at Cavendish Beach in December? — 5.0°C water5.0°C
Frequently asked questions
What is the average sea temperature at Cavendish Beach in September?
Cavendish Beach averages 15.0°C in September, based on long-run climatology for the Gulf of St Lawrence.
Is the sea warm enough to swim at Cavendish Beach in September?
Not without thermal protection — a wetsuit is recommended at 15.0°C.
Do I need a wetsuit at Cavendish Beach in September?
A 3/2 mm wetsuit makes longer swims comfortable.