December is a popular month to ask about Praia de Sao Martinho do Porto because conditions can shift week to week along this coast. Expect the water near 16.0°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 Atlantic Ocean.
Praia de Sao Martinho do Porto sea temperature in December — averages 16.0°C
The sea at Praia de Sao Martinho do Porto in Portugal averages 16.0°C during December, based on long-run climatology for the Atlantic Ocean. 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
16.0°C
mild · Fair
Live water now
…
Recommended wetsuit
3/2mm fullsuit
At 16.0°C a 3/2mm fullsuit is the standard wetsuit for surfing and watersports.
Monthly comparison
Yes, but expect a fresh dip · Praia de Sao Martinho do Porto
Can you swim at Praia de Sao Martinho do Porto in July? — 20.0°C water20.0°CCan you swim at Praia de Sao Martinho do Porto in August? — 21.0°C water21.0°CCan you swim at Praia de Sao Martinho do Porto in September? — 21.0°C water21.0°CCan you swim at Praia de Sao Martinho do Porto in October? — 19.0°C water19.0°CCan you swim at Praia de Sao Martinho do Porto in November? — 18.0°C water18.0°CCan you swim at Praia de Sao Martinho do Porto in December? — 16.0°C water16.0°C
Frequently asked questions
What is the average sea temperature at Praia de Sao Martinho do Porto in December?
Praia de Sao Martinho do Porto averages 16.0°C in December, based on long-run climatology for the Atlantic Ocean.
Is the sea warm enough to swim at Praia de Sao Martinho do Porto in December?
It is swimmable but fresh; confident swimmers will be fine without a wetsuit.
Do I need a wetsuit at Praia de Sao Martinho do Porto in December?
A 2 mm shorty is comfortable for sessions over 30 minutes.
Compare Praia de Sao Martinho do Porto with nearby beaches
Praia de Sao Martinho do Porto vs Praia de Salir do PortoPraia de Sao Martinho do Porto vs Praia da Foz do ArelhoPraia de Sao Martinho do Porto vs Praia de NazaréPraia de Sao Martinho do Porto vs Praia do NortePraia de Sao Martinho do Porto vs Praia de NazarePraia de Sao Martinho do Porto vs Praia do Norte Nazare