July is a popular month to ask about St Clair Beach because conditions can shift week to week along this coast. Expect the water near 9.0°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 Tasman Sea.
St Clair Beach sea temperature in July — averages 9.0°C
The sea at St Clair Beach in New Zealand averages 9.0°C during July, based on long-run climatology for the Tasman Sea. Use the live reading below for today's actual water and the monthly grid to compare with the rest of the year.
Average sea · July
9.0°C
cold · Poor
Live water now
…
Recommended wetsuit
5/4mm fullsuit + boots & gloves
At 9.0°C you need a 5/4mm fullsuit with boots, gloves and ideally a hood.
Monthly comparison
Cold — wetsuit recommended · St Clair Beach
Can you swim at St Clair Beach in June? — 10.0°C water10.0°CCan you swim at St Clair Beach in July? — 9.0°C water9.0°CCan you swim at St Clair Beach in August? — 9.0°C water9.0°CCan you swim at St Clair Beach in September? — 10.0°C water10.0°CCan you swim at St Clair Beach in October? — 11.0°C water11.0°CCan you swim at St Clair Beach in November? — 12.0°C water12.0°C
Frequently asked questions
What is the average sea temperature at St Clair Beach in July?
St Clair Beach averages 9.0°C in July, based on long-run climatology for the Tasman Sea.
Is the sea warm enough to swim at St Clair Beach in July?
Not without thermal protection — a wetsuit is recommended at 9.0°C.
Do I need a wetsuit at St Clair Beach in July?
A 4/3 mm full wetsuit, boots and neoprene cap are recommended.