September is a popular month to ask about Plage de Cap-des-Rosiers 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.
Plage de Cap-des-Rosiers sea temperature in September — averages 15.0°C
The sea at Plage de Cap-des-Rosiers 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 · Plage de Cap-des-Rosiers
Can you swim at Plage de Cap-des-Rosiers in July? — 16.0°C water16.0°CCan you swim at Plage de Cap-des-Rosiers in August? — 17.0°C water17.0°CCan you swim at Plage de Cap-des-Rosiers in September? — 15.0°C water15.0°CCan you swim at Plage de Cap-des-Rosiers in October? — 11.0°C water11.0°CCan you swim at Plage de Cap-des-Rosiers in November? — 8.0°C water8.0°CCan you swim at Plage de Cap-des-Rosiers in December? — 5.0°C water5.0°C
Frequently asked questions
What is the average sea temperature at Plage de Cap-des-Rosiers in September?
Plage de Cap-des-Rosiers 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 Plage de Cap-des-Rosiers in September?
Not without thermal protection — a wetsuit is recommended at 15.0°C.
Do I need a wetsuit at Plage de Cap-des-Rosiers in September?
A 3/2 mm wetsuit makes longer swims comfortable.