In summer, the average sea temperature at Cairns' northern beaches ranges from 28.9 - 29.4°C (84 - 84.9°F), dipping slightly in winter to 23.8 - 24.5°C (74.8 - 76.1°F).
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A: It is safe to swim all year round in Cairns, Port Douglas and the Great Barrier Reef but it is highly recommended that you wear a lycra suit when entering the water in the warmer months of November-April.
Travelling to Cairns and its surrounding beaches during the cooler months, such as August, means you can comfortably swim in the ocean without worrying about enclosures or stinger suits.
Makunufushi Island, Maldives. The Maldives doesn't have a swimming season because the water is always warm enough (82 to 86 degrees) to dive right in and splash around. There are tons of gorgeous beaches, but we're partial to the private island of Makunufushi.
Honestly, a lifetime is not enough to explore and enjoy all the amazing natural wonders of Cairns and the Great Barrier Reef. But if you can't spend your life on holiday, we recommend at least three days in Cairns to discover the main attractions. If you have more time, great!
We recommend getting there in the shoulder months of April and May and September and October. The weather is amazing at these times and you'll be beating the dry season crowds!