Is it safe to swim in Phuket: jellyfish, stingrays, currents
Swimming in Phuket is safe if you know three things: which months the sea is calm, what the flags mean and how to behave around what lives in the water. The main danger here is not jellyfish or sharks. It is the currents.
What is actually dangerous
| What | When and where | How to avoid it |
|---|---|---|
| Rip currents | May to October, open beaches, days with waves | Stay out under a red flag |
| Jellyfish | Mostly June to September, after onshore wind | Check the waterline and the warning signs |
| Sea urchins | All year, rocks and reefs at the ends of bays | Do not stand on rocks; wear water shoes |
| Stingrays | All year, sand in shallow water, rare | Shuffle your feet along the bottom |
| The sun | All year, 10:00 to 15:00 | Sunscreen, a shirt, shade |
Currents and waves
From May to October the monsoon brings waves to the west coast. The water they push up the beach flows back out in a narrow, fast stream: a rip current. It pulls out to sea even where the water is waist-deep, and it drowns more people than all sea creatures together.
- Red flag: do not go in at all.
- Swim between the red-and-yellow flags, where lifeguards are watching.
- If you are pulled out, do not swim for the shore; swim along it until the stream lets go.
The signs of a rip and what to do, step by step, are in Red flags on Phuket beaches. How many days with waves each month has is in Phuket waves by month.
Jellyfish
Phuket gets jellyfish, but not all the time: wind and current bring them in for a few days. It happens more often in the monsoon season, June to September.
- Small jellyfish and “sea lice”. The most common case. Feels like prickling and itching and passes within hours.
- Bluebottle (Portuguese man o' war). A blue bubble on the surface with long threads. Onshore wind washes it up on west coast beaches. The sting hurts and the mark lasts for days. It stings on the sand too: do not touch it, even if it looks dried out.
- Box jellyfish. The most dangerous; its sting can be life-threatening. In Thailand it is found mostly in the Gulf of Thailand and is rare around Phuket.
Signs that jellyfish are around: blue bubbles or jelly lumps along the waterline, warning signs, lifeguards keeping people out.
If you are stung
- Get out of the water and do not rub the sting.
- Rinse with seawater. Fresh water, alcohol and urine make it worse.
- Remove any tentacles with tweezers, the edge of a card or a hand wrapped in cloth.
- If a box jellyfish is suspected, pour vinegar over the area for at least 30 seconds. Many Thai beaches have vinegar stations for this.
- For a bluebottle sting, hot water, as hot as you can stand, for 20 minutes eases the pain.
- Go to hospital at once if the sting is large, the pain is severe, or there is trouble breathing, nausea or dizziness. Ambulance: 1669.
Stingrays
A ray lies on the bottom in shallow water, dusted with sand. It does not attack, but if stepped on it strikes with the barb on its tail. Such cases are rare in Phuket.
- Shuffle your feet along the bottom as you walk in, rather than stepping: the ray feels the movement and swims off.
- If stung: rinse the wound and soak the foot in hot water, as hot as you can stand, for 30–90 minutes. Heat breaks down the venom and eases the pain.
- Then see a doctor the same day: a piece of the barb may stay in the wound, and it gets infected easily.
Sea urchins and reef fish
Urchins live on rocks and reefs, usually at the ends of bays, the same places people snorkel. There are none on the sandy bottom in the middle of a beach.
- Do not stand on rocks or coral; swim above them. Water shoes prevent most injuries.
- Urchin spines are brittle and break off in the skin. Do not dig them out: soak the spot in hot water, and small fragments work their way out within days. For deep ones or ones near a joint, see a doctor.
- Lionfish and stonefish with venomous spines live on the reef. One rule: touch nothing and do not rest on the bottom. If stung, hot water and straight to hospital.
Sharks
Small reef sharks live off Phuket. They are not a danger to swimmers, and attacks here are extremely rare. Worry about currents, not sharks.
What else
- The sun. UV in Phuket is high all year; you can burn in 20 minutes even on a cloudy day. Today's level is in the header of the main page.
- Boats and jet skis. Swim inside the area marked with buoys.
- Water after heavy rain. After a downpour the water near canal mouths turns cloudy. Swim away from them for a day or two.
- Alcohol and night. Most accidents happen swimming at night or after drinking.
Choosing the day and the beach
The main page shows the wave height at every beach now and 10 days ahead, and the webcams show Kata, Karon and Patong this minute. On a day with waves choose a sheltered bay: it is noticeably calmer than an open beach.
This article is not medical advice. For any serious sting or wound, go to a hospital.
In short
Is it safe to swim in Phuket?
Yes, if you follow the flags. From November to April the sea is calm almost every day. From May to October the main danger is waves and rip currents; in those months swim only where there are lifeguards and no red flag.
Are there jellyfish in Phuket?
Sometimes. Mostly small jellyfish and bluebottles (Portuguese man o' war) that the wind pushes onto the west coast in the monsoon season, June to September. Dangerous box jellyfish are rare around Phuket.
What should I do about a jellyfish sting?
Get out of the water, rinse with seawater, remove any tentacles without using bare fingers, and do not rub. Fresh water, alcohol and urine make it worse. With severe pain, a large sting, shortness of breath or weakness, go to hospital at once; the ambulance number is 1669.
Are there stingrays in Phuket?
Yes, as on any tropical sandy coast, but stings are rare. A ray lies in the sand in shallow water and stings only when stepped on. Shuffle your feet along the bottom as you walk in.
Are there sharks in Phuket?
Small reef sharks live near the coast and are not a danger to swimmers. Attacks in Phuket are extremely rare.
What is the biggest danger in the sea in Phuket?
Rip currents. They drown more people than all sea creatures together. They form on open beaches on days with waves.