Jellyfish at Sai Kaew Beach (Koh Samet)

หาดทรายแก้ว · Koh Samet · Gulf of Thailand

Risk today · 25 Oct 2026Moderate

Main factor: Stronger wind than usual

Conditions or reports nearby make an encounter more likely.

Today the jellyfish risk at Sai Kaew Beach (Koh Samet) Beach is moderate. Main factor: stronger wind than usual. In October it is usually moderate here. It is an estimate, not a guarantee: follow beach flags and lifeguards.

What to expect today

5-day outlook

  1. TodayModerate3 m/s SE — Wind: up to 3 m/s, blowing from SE. The arrow shows where it blows to. Onshore wind pushes jellyfish to the beach.0.2 m — Waves: up to 0.2 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.2 mm — Rain: 2 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  2. TomorrowModerate4 m/s SE — Wind: up to 4 m/s, blowing from SE. The arrow shows where it blows to. Onshore wind pushes jellyfish to the beach.0.3 m — Waves: up to 0.3 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.9 mm — Rain: 9 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  3. Tue 27Moderate3 m/s NE — Wind: up to 3 m/s, blowing from NE. The arrow shows where it blows to. Onshore wind pushes jellyfish to the beach.0.3 m — Waves: up to 0.3 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.4 mm — Rain: 4 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  4. Wed 28Moderate3 m/s NE — Wind: up to 3 m/s, blowing from NE. The arrow shows where it blows to. Onshore wind pushes jellyfish to the beach.0.2 m — Waves: up to 0.2 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.1 mm — Rain: 1 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  5. Thu 29Moderate2 m/s NE — Wind: up to 2 m/s, blowing from NE. The arrow shows where it blows to. Onshore wind pushes jellyfish to the beach.0.2 m — Waves: up to 0.2 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.8 mm — Rain: 8 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  6. Fri 30Moderate3 m/s NE — Wind: up to 3 m/s, blowing from NE. The arrow shows where it blows to. Onshore wind pushes jellyfish to the beach.0.1 m — Waves: up to 0.1 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.2 mm — Rain: 2 mm in the day. Box jellyfish are more common near river mouths after heavy rain.

Why this level

  • Other jellyfish and stinging plankton Moderateraises risk
    above usual for the season · stronger wind than usual · onshore wind
  • Bluebottles (Portuguese man o’ war) Moderateraises risk
    above usual for the season · steady onshore wind for 3 days · stronger wind than usual
  • Box jellyfish Moderateraises risk
    above usual for the season · rain · waves toward the shore

October is an average month for jellyfish on the eastern Gulf coast, the wind blows from the sea (~2.3 m/s), stronger than usual, the wind has blown from the sea for 3 days in a row, which is how bluebottles usually arrive, the sea is calm (waves ~0.2 m), so the risk level is moderate. There are no recent jellyfish reports.

Recent reports

No recent reports.

Report jellyfish

At this beach now? Your report helps others. "No jellyfish today" is useful too.

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Seasonality

Bars show the baseline seasonal risk for this coast; dots show official warnings nearby by month.

Sai Kaew Beach (Koh Samet): jellyfish month by month

  1. January: Usually moderate risk. High risk on 0% of days. Onshore wind on 45% of days. Official warnings: 0. Eyewitness reports: 1.
  2. February: Usually moderate risk. High risk on 11% of days. Onshore wind on 72% of days. Official warnings: 0. Eyewitness reports: 2.
  3. March: Usually moderate risk. High risk on 14% of days. Onshore wind on 92% of days. Official warnings: 0. Eyewitness reports: 1.
  4. April: Usually low risk. High risk on 0% of days. Onshore wind on 95% of days. Official warnings: 0.
  5. May: Usually moderate risk. High risk on 0% of days. Onshore wind on 95% of days. Official warnings: 0.
  6. June: Usually moderate risk. High risk on 4% of days. Onshore wind on 90% of days. Official warnings: 0.
  7. July: Usually moderate risk. High risk on 31% of days. Onshore wind on 78% of days. Official warnings: 0.
  8. August: Usually moderate risk. High risk on 33% of days. Onshore wind on 90% of days. Official warnings: 0.
  9. September: Usually moderate risk. High risk on 13% of days. Onshore wind on 71% of days. Official warnings: 0. Eyewitness reports: 1.
  10. October: Usually moderate risk. High risk on 12% of days. Onshore wind on 34% of days. Official warnings: 0.
  11. November: Usually low risk. High risk on 0% of days. Onshore wind on 17% of days. Official warnings: 0.
  12. December: Usually low risk. High risk on 0% of days. Onshore wind on 6% of days. Official warnings: 0.
  • Low
  • Moderate
  • High
  • Very high

Colour shows the typical risk level that month; the number is the share of high-risk days. Warnings and sightings are in each month’s tooltip.

Coordinates: 12.5664, 101.4661

Questions and answers

Can I swim at Sai Kaew Beach (Koh Samet) today?

Today's estimated risk is moderate; main factor: stronger wind than usual. It is an estimate, not a guarantee: "no reports" does not mean there are no jellyfish. Check beach flags and follow lifeguards.

Have jellyfish been seen at Sai Kaew Beach (Koh Samet) recently?

No reports in the last 14 days. It is an estimate, not a guarantee: "no reports" does not mean there are no jellyfish. Check beach flags and follow lifeguards.

In which months are jellyfish more likely at Sai Kaew Beach (Koh Samet)?

Based on 2022–2026 weather, the risk is most often elevated in July, August, September. Official warnings nearby: 0.

Who do I call after a jellyfish sting?

Emergency medical services in Thailand: 1669 (free). Alert the beach lifeguard; if a box jellyfish is possible, pour vinegar over the sting for at least 30 seconds.