What is jellyfish season 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 Cairns and Far North Queensland, "Jellyfish Season" (also known as Stinger Season) typically runs from November through May. This is when the water temperatures rise, attracting dangerous species like the Box Jellyfish and the tiny, nearly invisible Irukandji. During these months, swimming at mainland beaches is only recommended within "stinger nets"—enclosures designed to keep large jellyfish out—or while wearing a full-body "stinger suit" (lycra suit). It is a common misconception that you cannot visit the Great Barrier Reef during this time; in fact, the outer reef is generally much safer than the coastal beaches because these jellyfish prefer calm, inshore waters. However, most reputable tour operators in 2026 still provide protective suits to all guests as a precaution. Outside of these months (June to October), the risk is significantly lower, but travelers should always follow local signage and lifeguard advice, as environmental shifts can occasionally bring stingers into the area out of season.

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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.

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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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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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The Cairns Lagoon is a popular swimming facility located along the Cairns Esplanade in the Central Business District. This 4800 square metre saltwater swimming lagoon offers an all-year-round, safe, swimming location without stingers and crocodiles.

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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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Keep a safe distance if you see a crocodile. Be aware that crocodiles often will bask with an open mouth to regulate their body temperature, and there's no cause for concern if you see this behavior. Swim only in designated swimming areas and only during daylight hours. Crocodiles are most active between dusk and dawn.

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the 'sand' is very silty all along that part of the coast ie. soil washed down by the rivers. therefore shore wave action causes the 'mud' to disperse thru the water column. that's the brown stain.

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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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