December is a popular month to ask about Thunder Cove because conditions can shift week to week along this coast. Expect the water near 2.0°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.
Thunder Cove sea temperature in December — averages 2.0°C
The sea at Thunder Cove in Canada averages 2.0°C during December, 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 · December
2.0°C
cold · Poor
Live water now
…
Recommended wetsuit
6/5/4mm hooded fullsuit or drysuit
At 2.0°C only experienced cold-water athletes should enter — full thermal protection required.
Monthly comparison
Cold — wetsuit recommended · Thunder Cove
Can you swim at Thunder Cove in June? — 13.0°C water13.0°CCan you swim at Thunder Cove in July? — 18.0°C water18.0°CCan you swim at Thunder Cove in August? — 20.0°C water20.0°CCan you swim at Thunder Cove in September? — 17.0°C water17.0°CCan you swim at Thunder Cove in October? — 12.0°C water12.0°CCan you swim at Thunder Cove in November? — 6.0°C water6.0°C
Frequently asked questions
What is the average sea temperature at Thunder Cove in December?
Thunder Cove averages 2.0°C in December, based on long-run climatology for the Gulf of St Lawrence.
Is the sea warm enough to swim at Thunder Cove in December?
Not without thermal protection — a wetsuit is recommended at 2.0°C.
Do I need a wetsuit at Thunder Cove in December?
A 4/3 mm full wetsuit, boots and neoprene cap are recommended.