August is a popular month to ask about Greenwich Beach because conditions can shift week to week along this coast. Expect the water near 20.0°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.
Greenwich Beach sea temperature in August — averages 20.0°C
The sea at Greenwich Beach in Canada averages 20.0°C during August, 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 · August
20.0°C
warm · Good
Live water now
…
Recommended wetsuit
Shorty 2mm
At 20.0°C a 2mm shorty keeps surfers warm; lap swimmers can usually skip the neoprene.
Monthly comparison
Yes — comfortable for most swimmers · Greenwich Beach
Can you swim at Greenwich Beach in June? — 13.0°C water13.0°CCan you swim at Greenwich Beach in July? — 18.0°C water18.0°CCan you swim at Greenwich Beach in August? — 20.0°C water20.0°CCan you swim at Greenwich Beach in September? — 17.0°C water17.0°CCan you swim at Greenwich Beach in October? — 12.0°C water12.0°CCan you swim at Greenwich Beach in November? — 6.0°C water6.0°C
Frequently asked questions
What is the average sea temperature at Greenwich Beach in August?
Greenwich Beach averages 20.0°C in August, based on long-run climatology for the Gulf of St Lawrence.
Is the sea warm enough to swim at Greenwich Beach in August?
Yes, most swimmers find 20.0°C comfortable for unrestricted swimming.
Do I need a wetsuit at Greenwich Beach in August?
Most swimmers don't need a wetsuit; a rash vest helps for longer sessions.