Jellyfish in Koh Samui

Today no beach in Koh Samui has a high jellyfish risk: the highest level is moderate (10 of 10). It is an estimate, not a guarantee: follow beach flags and lifeguards.

Surat Thani · Gulf of Thailand · 10 beaches in this area. Level is today's estimated risk.

LowModerateHighVery high

Beaches

Koh Samui: jellyfish month by month

  1. 0%Jan20January: Usually low risk. High risk on 0% of days. Onshore wind on 67% of days. Official warnings: 0. Eyewitness reports: 20.
  2. 15%Feb29February: Usually moderate risk. High risk on 15% of days. Onshore wind on 50% of days. Official warnings: 0. Eyewitness reports: 29.
  3. 32%Mar147March: Usually moderate risk. High risk on 32% of days. Onshore wind on 45% of days. Official warnings: 1. Eyewitness reports: 47.
  4. 20%Apr27April: Usually moderate risk. High risk on 20% of days. Onshore wind on 44% of days. Official warnings: 0. Eyewitness reports: 27.
  5. 2%May25May: Usually moderate risk. High risk on 2% of days. Onshore wind on 34% of days. Official warnings: 0. Eyewitness reports: 25.
  6. 0%Jun25June: Usually low risk. High risk on 0% of days. Onshore wind on 23% of days. Official warnings: 0. Eyewitness reports: 25.
  7. 1%Jul284July: Usually moderate risk. High risk on 1% of days. Onshore wind on 23% of days. Official warnings: 2. Eyewitness reports: 84.
  8. 35%Aug99+August: Usually moderate risk. High risk on 35% of days. Onshore wind on 23% of days. Official warnings: 0. Eyewitness reports: 111.
  9. 4%Sep77September: Usually moderate risk. High risk on 4% of days. Onshore wind on 26% of days. Official warnings: 0. Eyewitness reports: 77.
  10. 1%Oct73October: Usually moderate risk. High risk on 1% of days. Onshore wind on 53% of days. Official warnings: 0. Eyewitness reports: 73.
  11. 2%Nov18November: Usually moderate risk. High risk on 2% of days. Onshore wind on 68% of days. Official warnings: 0. Eyewitness reports: 18.
  12. 0%Dec18December: Usually low risk. High risk on 0% of days. Onshore wind on 76% of days. Official warnings: 0. Eyewitness reports: 18.
  • typical level that month
  • bar and % — share of high-risk days
  • nofficial warnings, all years
  • neyewitness reports, all years

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Questions and answers

Are there jellyfish in Koh Samui right now?

Today across 10 beaches: moderate — 10. The highest risk is at Chaweng Noi Beach (calm water and rain). 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 Koh Samui?

Based on 2022–2026 weather, the risk in Koh Samui is most often elevated in February, March, August. Official DMCR warnings nearby: 3.

Which beaches in Koh Samui have the lowest risk today?

Lowest estimate today: Taling Ngam Beach, Lipa Noi Beach, Lamai Beach. It is an estimate, not a guarantee: "no reports" does not mean there are no jellyfish. Check beach flags and follow lifeguards.

Which dangerous jellyfish occur in Koh Samui?

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.