Jellyfish in the Andaman Sea

Today no beach in the Andaman Sea has a high jellyfish risk: the highest level is moderate (27 of 90). It is an estimate, not a guarantee: follow beach flags and lifeguards.

Jellyfish in the Andaman Sea today and for 5 days: risk on 90 beaches in 14 areas, where it is higher now, when the season is and which species occur.

LowModerateHighVery high

Areas by risk today

  1. Phuket28 beachesModerate
  2. Koh Lipe3 beachesModerate
  3. Trang11 beachesModerate
  4. Koh Rok1 beachesModerate
  5. Surin Islands2 beachesLow
  6. Koh Phi Phi7 beachesLow
  7. Koh Yao4 beachesModerate
  8. Similan Islands1 beachesLow
  9. Khao Lak10 beachesModerate
  10. Koh Chang (Ranong)2 beachesModerate
  11. Koh Phayam2 beachesModerate
  12. Krabi (Ao Nang)8 beachesModerate
  13. Koh Lanta8 beachesLow
  14. Satun (Tarutao, Pak Bara)3 beachesLow

Andaman Sea: jellyfish month by month

  1. 3%Jan99+January: Usually moderate risk. High risk on 3% of days. Onshore wind on 25% of days. Official warnings: 0. Eyewitness reports: 461.
  2. 5%Feb499+February: Usually moderate risk. High risk on 5% of days. Onshore wind on 29% of days. Official warnings: 4. Eyewitness reports: 360.
  3. 3%Mar499+March: Usually moderate risk. High risk on 3% of days. Onshore wind on 35% of days. Official warnings: 4. Eyewitness reports: 485.
  4. 21%Apr199+April: Usually moderate risk. High risk on 21% of days. Onshore wind on 55% of days. Official warnings: 1. Eyewitness reports: 361.
  5. 26%May499+May: Usually moderate risk. High risk on 26% of days. Onshore wind on 62% of days. Official warnings: 4. Eyewitness reports: 136.
  6. 14%Jun799+June: Usually moderate risk. High risk on 14% of days. Onshore wind on 75% of days. Official warnings: 7. Eyewitness reports: 263.
  7. 6%Jul299+July: Usually moderate risk. High risk on 6% of days. Onshore wind on 76% of days. Official warnings: 2. Eyewitness reports: 111.
  8. 9%Aug177August: Usually moderate risk. High risk on 9% of days. Onshore wind on 77% of days. Official warnings: 1. Eyewitness reports: 77.
  9. 6%Sep399+September: Usually moderate risk. High risk on 6% of days. Onshore wind on 76% of days. Official warnings: 3. Eyewitness reports: 189.
  10. 2%Oct99+October: Usually moderate risk. High risk on 2% of days. Onshore wind on 57% of days. Official warnings: 0. Eyewitness reports: 121.
  11. 0%Nov84November: Usually moderate risk. High risk on 0% of days. Onshore wind on 36% of days. Official warnings: 0. Eyewitness reports: 84.
  12. 1%Dec199+December: Usually low risk. High risk on 1% of days. Onshore wind on 25% of days. Official warnings: 1. Eyewitness reports: 175.
  • typical level that month
  • bar and % — share of high-risk days
  • nofficial warnings, all years
  • neyewitness reports, all years

Phuket has two jellyfish seasons

June–September, south-west monsoon

Onshore wind pushes bluebottles (Portuguese man o’ war) onto the beaches, especially on the exposed west coast after several days of steady westerly wind.

January–April, dry season

Beachgoers most often report other jellyfish: large rhizostome jellyfish, lilac medusae and stinging plankton. The peak is in January, with a second wave in March in some years. The sea is calm then, and stinging plankton shows up as a prickling of the skin in the water.

Jellyfish found here

All jellyfish species in Thailand →

Questions and answers

Are there jellyfish in the Andaman Sea right now?

Today across 90 beaches: low — 63, moderate — 27. The highest estimate is in Phuket. Jellyfish reports in the last 7 days: 0. It is an estimate, not a guarantee: "no reports" does not mean there are no jellyfish. Check beach flags and follow lifeguards.

When is jellyfish season in the Andaman Sea?

Based on 2022–2026 weather, the risk in the Andaman Sea is most often elevated in March, April, May. Official DMCR warnings on these beaches: 27.

Why are the seasons different on the Andaman and Gulf coasts?

The south-west monsoon (May–October) pushes water and floating jellyfish onto Andaman beaches, while on the Gulf coast onshore winds are more common later in the year and in winter. The higher-risk months on the two coasts therefore differ.

Which dangerous jellyfish occur in the Andaman Sea?

Recorded on this coast: Thai box jellyfish (Chironex), Chiropsoides box jellyfish, Morbakka (single-tentacle box jellyfish), Portuguese man o’ war (bluebottle), Sea nettle (fire jellyfish).

What should I do if a jellyfish stings me in Thailand?

Get out of the water. Call 1669 for trouble breathing, chest pain or collapse. Do not rub the sting and do not rinse it with fresh water. If a box jellyfish is possible, pour vinegar over the sting for at least 30 seconds.