What time of year are jellyfish in Cairns?

There are many different kinds and they are usually most prevalent during the Cairns jellyfish 'season', which is generally from November to May. Why? Jellyfish prefer warm, tropical waters, so summer in Cairns Queensland provides ideal conditions.



In 2026, the "stinger season" in Cairns and Tropical North Queensland typically runs from November to May. During these months, the warm tropical waters see a significant increase in Box Jellyfish and the tiny, highly dangerous Irukandji. While this coincides with the "Green Season" (wet season), you can still swim safely in 2026 by using the stinger enclosures (netted areas) found at popular beaches like Palm Cove or Trinity Beach. If you are heading out to the Great Barrier Reef, the risk is slightly lower than at the shore, but tour operators in 2026 strongly recommend (and often mandate) the use of full-body lycra "stinger suits" to provide a physical barrier against stings. If you visit between June and October, the water is generally free of these jellyfish, though the water temperature is slightly cooler. Always heed the local 2026 beach signs and lifeguard warnings, as stinger presence can shift with the wind and tides.

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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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From the first of November until the start of May, the stinger nets are out around Cairns and Port Douglas. Those hitting the beach should be sure to only swim in patrolled areas and to look for the comforting colours of the red and yellow flags.

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We highly recommend wearing the stinger suits – regardless of the time of year – as it will not only protect you from cairns jellyfish stings, but also provide sun protection in the tropical climate. Snorkellers do not need to fear cairns jellyfish on the Great Barrier Reef. Jellyfish are found around the world.

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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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The best beaches to swim at are mainly in the Northern suburbs. The beaches in the city aren't suitable for swimming due to crocodiles and it being too buddy. However, there is a lagoon to swim in if you're staying in Cairns City.

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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.

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Two types of marine stingers, or jellyfish, are found on Cairns' Great Barrier Reef. Both are poisonous and can leave painful stings and sometimes scars. Usually, they are only present in the waters between November and May, but this may change pending weather conditions.

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