January is a popular month to ask about Semaphore 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 Southern Ocean.
Semaphore Beach sea temperature in January — averages 20.0°C
The sea at Semaphore Beach in Australia averages 20.0°C during January, based on long-run climatology for the Southern 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 · January
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 · Semaphore Beach
Can you swim at Semaphore Beach in June? — 15.0°C water15.0°CCan you swim at Semaphore Beach in July? — 14.0°C water14.0°CCan you swim at Semaphore Beach in August? — 14.0°C water14.0°CCan you swim at Semaphore Beach in September? — 15.0°C water15.0°CCan you swim at Semaphore Beach in October? — 16.0°C water16.0°CCan you swim at Semaphore Beach in November? — 17.0°C water17.0°C
Frequently asked questions
What is the average sea temperature at Semaphore Beach in January?
Semaphore Beach averages 20.0°C in January, based on long-run climatology for the Southern Ocean.
Is the sea warm enough to swim at Semaphore Beach in January?
Yes, most swimmers find 20.0°C comfortable for unrestricted swimming.
Do I need a wetsuit at Semaphore Beach in January?
Most swimmers don't need a wetsuit; a rash vest helps for longer sessions.