Average monthly water temperature in Sydney, Australia
On this page you find the mean water temperature over the year in Sydney (New South Wales), Australia. Get insights into the water temperature fluctuations and discover what they mean for visitors.
In Sydney, the water undergoes seasonal changes. The warmest month is January, with an average water temperature of 21°C (70°F).
The coldest water temperature month, August, has an average temperature of 16°C (61°F). It may not be the ideal time for a swim.
Sydney Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sydney - and find the best time to visit.
Sydney 3-Day Forecast
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Sydney climate overview or explore weather in Australia.
Popular this month
Where to go in August - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
An alternative way to discover Sydney
We have made an overview of the sights in Sydney that you must see if you want to visit Sydney in an alternative way.
The most relaxed and alternative area of Australia is called the Byron Shire
The Byron Shire is one of the most pretty areas in the world. Not only in terms on natural beauty, also the relaxed vibe and people make this an area that remains close to your heart.
Sail the Whitsunday islands
The best travel period to sail the Whitsunday islands is “winter” between June and October, with pleasant temperatures around 23 degrees Celsius (74 Fahrenheit).
The best dive spots in Australia
Explore Australia's best dive spots: from the Great Barrier Reef to HMAS Perth. Discover vibrant corals, marine life, and historic wrecks.