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.
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The best time to visit the Great Barrier Reef is from June to October. This peak season offers some key advantages for travelers.
The warm water means one thing: stingers. While marine stingers are found along the Great Barrier Reef all year round, the potentially lethal jellyfish species – Box and Irukandji – enter the waters from November through May.
Avoiding stinger seasonWhen you snorkel on the Great Barrier Reef during May to October you will avoid the peak stinger season. This is where box jellyfish and irukandji jellyfish are around. These jellyfish are around all year, they are more common during the warmer months.
Although it's mid winter, July is also the perfect time to visit the Great Barrier Reef, with the air temperatures in the mid 20's and the water temperature between 22° and 25° it's equivalent to a mild Sydney summers day, and definately warmer in the water than Melbourne or Adelaide in the middle of their summer!
Snorkeling is an extremely safe activity, especially if you take all of the correct precautions and listen to your own body whilst swimming. Below are some basic Great Barrier Reef snorkeling safety tips. Fitness. Make sure you only snorkel / swim to your fitness levels.
Take care when diving and snorkellingBe aware of where your fins are and avoid touching anything with them. Don't rest or stand on coral. If you must stand up, make sure it is on sand or use rest stations. Observe animals rather than handling them directly, and avoid blocking the path of free swimming animals.
Yes you can swim in Cairns beaches, however it can be very dangerous between the months of November – May. Most locals would recommend swimming in freshwater lagoons, lakes and waterfalls to avoid crocodiles, jellyfish and other dangerous animals in the sea.
Reef Shark & SnorkelerIn general, snorkeling and scuba diving on the Great Barrier Reef you will have no problem at all with these reef-dwelling sharks. They can, in fact, be a highlight of any snorkeling or scuba diving trip, often being the hot topic of conversation if you manage to spot one.
Snorkelling. The sites in the Great Barrier Reef are shallow enough so that you can easily explore everything below the water's surface. The water in these parts is pleasantly warm and ideal for novices. There are plenty snorkelling expeditions from the main towns along the coasts.
Whilst varieties of marine stingers can be found year-round on the Great Barrier Reef, they are most prevalent during 'stinger season' which runs during the warmer months of the year, from the beginning of November until the end of May.