When not to visit the Great Barrier Reef?

The Great Barrier Reef is also prone to thunderstorms and the occasional cyclone. If you want reliably good underwater visibility, summer might not be the best time as rain and storms can cause the water to become murky. It's not all bad though.



The least ideal time to visit the Great Barrier Reef is during the peak wet season, which runs from January to March. During these months, Northern Queensland experiences high humidity, frequent heavy rainfall, and the highest risk of tropical cyclones. While rain doesn't always ruin underwater visibility (as the reefs are far offshore), it can make for rough boat crossings and lead to tour cancellations. Furthermore, this period falls within "stinger season" (November to May), when lethal Box and Irukandji jellyfish are most prevalent, making stinger suits mandatory for safe swimming. If you are a diver seeking the best conditions, avoid the Southern Hemisphere's winter months of June to August if you dislike cooler winds and water temperatures (which drop to 22°C/72°F). For the absolute best experience in 2026, aim for the "shoulder" months of October and November, just before the monsoon rains begin and the humidity becomes oppressive.

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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.

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Take care when diving and snorkelling Be 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.

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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.

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Snorkeling Tips. 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.

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Reef Shark & Snorkeler In 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.

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Flush the wound with a half-strength solution of hydrogen peroxide in water. Rinse again with water. Apply a thin layer of antiseptic ointment, and cover the wound with a dry, sterile and non-adherent dressing. If you have no ointment or dressing, you can leave the wound open.

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