Have a nice day. Welcome to our website. The Diving & Snorkeling Equipment Supplier in Phu Quoc Island

What You Need To Know About Jellyfish Season In Phu Quoc Island, Vietnam

In this post, we share OnBird’s insightful information about the jellyfish season in Phu Quoc Island, Vietnam, and what you need to prepare for snorkeling & diving in the jellyfish time.



1. Jellyfish Season in Phu Quoc

Jellyfish time in Phu Quoc starts at the end of November and lasts until the middle of December, serious time will be at the beginning of December til the middle of December, at some spots you can run into a swarm of jellyfish. However, Jellyfish are mostly lone drifters, so seeing a group of jellyfish is rare.

At the beginning of the summertime (April), you might run into small jellyfish in the water, or at the beginning of May, you will see many small jellyfish floating in the water. For more accurate updates in real time, please contact OnBird on Whatsapp at +84 363 759 280. Long-sleeve shirt or rashguard is highly recommended at this time.


2. What species of Jellyfish you can run into in Phu Quoc

  • Moon jellyfish
  • Comb Jellyfish
  • Cauliflower Jellyfish or Crown jellyfish
  • Box jellyfish (Four-Handed Box Jellyfish): The Box Jellyfish is a highly advanced species. Native to the shallow waters of the Indo-Pacific region in general and Phu Quoc in particular, the Jellyfish species is considered to be one of the most poisonous sea creatures.
  • Lion’s Mane Jellyfish


3. Safety Guides For Snorkeling & Diving In Jellyfish Season

You should not stay bared body while snorkeling & diving to protect yourself from poisoned creatures in general or jellyfish in particular, wear protective clothing: a long-sleeved shirt and swimming trousers would be the best pair to protect yourselves from unwanted sea creature touches, to keep your body warm, to minimize the use of sunscreen which is harmful to coral as well as useless as the waves will take it away.

Always look around especially stay away from the moving currents as jellyfish can come just after a few seconds when you don’t pay attention to surrounding things.

4. OnBird Guides on Characteristics Of Deadly Poisonous Jellyfish

If you are not a marine expert, we hope with some of the information here you will be able to determine deadly poisonous jellyfish even if you have seen them before, jellyfish sting spray and humans with their tentacles or tails, so “tentacles” or “tail” is one of the important signs to determine deadly poisonous jellyfish.

  • Long/ very long tentacle tails in comparison to their jellyfish head size: this is one of the most common outward appearances of deadly poisonous jellyfish: tale can be 0.5m to 2 – 4m or even longer
  • Small tentacles/tails diameter: The small diameter of tentacles/tails makes them look like transparent threads in the water
  • The size of jellyfish does not matter: some small jellyfishes can kill people within a few minutes and some are tiny size like our finger that is very difficult to see with our eyes in the water.

In Phu Quoc, we have seen four-tail box jellyfish in South Phu Quoc Island, which is a species of extremely venomous but they are very rarely seen in Phu Quoc.


5. Expertly Instructions For Safe Snorkeling In The Jellyfish Safely

Not all jellyfish species are so passive but most Jellyfish are known for drifting to and fro at the whim of ocean currents, they ride the current and come and go with the current so one of the very important instructions is that if you run into jellyfish swarm, please follow OnBird’s instructions:

  • Stay Calm and determine the direction of flow as jellyfish ride the current so you need to know where they are moving to
  • Swim with the current but away (Swim diagonally out of the current) from the main direction so you will get out of the way of jellyfish: as jellyfish ride the current if you are not in the current they won’t approach you
  • Try to see any poisonous or deadly jellyfish with the aforementioned signs of tentacles/tails: The jellyfish with long and thin tentacles/tails such as Four-tail Box Jellyfish are usually dangerous and poisonous to humans, if you don’t see them, luckily, you will get some itchy at night


6. Can You Do Snorkeling and Diving in This Jellyfish Season?

Yes, we still do snorkeling & diving in this Jellyfish season but it requires protective clothing to protect you. Follow your underwater instructors and instructions from professional operators who have a good understanding of the local seawater. We provide wetsuits, and rashguards for rent if you need them at this time, between November and January, the water temperature in Phu Quoc is also coldest around 25 – 26 Degrees Celsius, we recommend wearing a long-sleeve shirt or wetsuit to keep yourself warm while snorkeling & diving. Don’t be surprised if you see a professional underwater instructor in their wetsuit, it’s simply for safety reasons.

In the Jellyfish Season, the Southern Water will be more jellyfish than the Northern water, thereby Discovery Snorkeling to visit Coral Jungle Reef (with some other options) will be recommended rather than Discovery Snorkeling to hidden coral spots in South Phu Quoc.

A bikini is not recommended for a professional snorkeling experience, wear a long swimming suit or wetsuit in cold water time in Phu Quoc to protect yourself in the water as well as remove the demand for sunscreen while snorkeling.


1. Think about long-sleeved rashguard shirts or even wetsuits as an essential item

Outdoor activities require people to respect nature and use common sense and precautions to stay safe and have fun. By being prepared for challenges, you can enjoy yourself and not be at risk. You should add rash guard shirts and if possible, a jellyfish sting prevention lotion, to your travel gear along with safe-reef sunscreen.

A rash guard shirt is an essential item we recommend as it helps to protect you from UV rays and jellyfish in the water and keeps your body warm. Besides, it also keeps the sun off you while you are in the water as well as on land without having to rely on sunblock. Many sunblock products can be damaging to coral, a huge ecological problem, so wearing less sunscreen is always a good idea.

If you forget to prepare one before packing, coming to Phu Quoc, you can buy (unisex) rashguard shirts at Phu Quoc Dive Shop (Google map: Valley Village Phu Quoc Resort – OnBird Phu Quoc office).

Besides rashguard shirts, Phu Quoc Dive Shop (website) (Map) is an “Authorized high-quality Diving & Snorkeling equipment supplier based in Phu Quoc Island, Vietnam”, where you can find high-quality snorkeling, diving gear, and wetsuits as well. 

2MM Gloove to protect hands in the cold water and jellyfish season

Protective suit for snorkeling & diving in the Jelly fish season in Phu Quoc Island, Vietnam
Protective suit for snorkeling & diving in the Jellyfish season in Phu Quoc Island, Vietnam

​3MM HOOD to protect the head in the cold water and jellyfish season​

Hdn0130 Removebg Preview



2. First Aid Treatment for Jellyfish Stings

There are some jellyfish, including box jellyfish and Irukandji that are dangerous and require emergency first aid.

  • Rinse the area with vinegar, for at least 30 seconds. If you don’t have vinegar, use seawater.
  • Remove tentacles from the skin with tweezers (Be careful not to rub the sting area or to get sand into the sting)
  • Once the tentacles are removed, soak the area in hot but not scalding water for 20 to 45 minutes.
  • If hot water is not available, apply a cold pack to help the pain. Don’t apply ice directly to unprotected skin.
  • If there are any signs of respiratory distress, go as quickly as possible to the nearest hospital.

On OnBird’s discovery-oriented scientific snorkeling trip, we always prepare vinegar for jellyfish-related emergency cases.


Even if you’re traveling solo, go with your partners/ friends, or your beloved curious kids, we have a handful of advice from our own experience of operating thousands of professional snorkel and diving trips in Phu Quoc Island.

Start to explore your options here or check out the tours that our guests usually prefer at this link.






Share the Post:

Related Posts