Jellyfish at Lamai Beach

หาดละไม · Koh Samui · Gulf of Thailand

Risk today · 25 Oct 2026Moderate

Main factor: Calm water and rain

Conditions or reports nearby make an encounter more likely.

Today the jellyfish risk at Lamai Beach is moderate. Main factor: calm water and rain. 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 S — Wind: up to 3 m/s, blowing from S. 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.7 mm — Rain: 7 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.5 mm — Rain: 5 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  3. Tue 27Moderate5 m/s E — Wind: up to 5 m/s, blowing from E. 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.30 mm — Rain: 30 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  4. Wed 28Moderate4 m/s E — Wind: up to 4 m/s, blowing from E. 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.
  5. Thu 29Moderate4 m/s E — Wind: up to 4 m/s, blowing from E. 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.38 mm — Rain: 38 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  6. Fri 30Moderate5 m/s E — Wind: up to 5 m/s, blowing from E. The arrow shows where it blows to. Onshore wind pushes jellyfish to the beach.0.4 m — Waves: up to 0.4 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.24 mm — Rain: 24 mm in the day. Box jellyfish are more common near river mouths after heavy rain.

Why this level

  • Box jellyfish Moderateusual background
    calm water and rain, usual for the season
  • Other jellyfish and stinging plankton Lowusual background
    jellyfish season in this area, usual for the season
  • Bluebottles (Portuguese man o’ war) Lowraises risk
    above usual for the season · stronger wind than usual

October is an average month for jellyfish on the Samui archipelago, the wind is light or along the shore, the sea is calm (waves ~0.1 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.

Lamai: jellyfish month by month

  1. January: Usually low risk. High risk on 0% of days. Onshore wind on 74% of days. Official warnings: 0. Eyewitness reports: 8.
  2. February: Usually moderate risk. High risk on 9% of days. Onshore wind on 99% of days. Official warnings: 0. Eyewitness reports: 5.
  3. March: Usually moderate risk. High risk on 34% of days. Onshore wind on 93% of days. Official warnings: 1. Eyewitness reports: 10.
  4. April: Usually moderate risk. High risk on 14% of days. Onshore wind on 77% of days. Official warnings: 0. Eyewitness reports: 4.
  5. May: Usually moderate risk. High risk on 3% of days. Onshore wind on 46% of days. Official warnings: 0. Eyewitness reports: 12.
  6. June: Usually low risk. High risk on 0% of days. Onshore wind on 10% of days. Official warnings: 0. Eyewitness reports: 9.
  7. July: Usually moderate risk. High risk on 1% of days. Onshore wind on 10% of days. Official warnings: 1. Eyewitness reports: 28.
  8. August: Usually moderate risk. High risk on 34% of days. Onshore wind on 8% of days. Official warnings: 0. Eyewitness reports: 34.
  9. September: Usually moderate risk. High risk on 7% of days. Onshore wind on 13% of days. Official warnings: 0. Eyewitness reports: 29.
  10. October: Usually moderate risk. High risk on 3% of days. Onshore wind on 32% of days. Official warnings: 0. Eyewitness reports: 42.
  11. November: Usually moderate risk. High risk on 0% of days. Onshore wind on 63% of days. Official warnings: 0. Eyewitness reports: 6.
  12. December: Usually low risk. High risk on 0% of days. Onshore wind on 61% of days. Official warnings: 0. Eyewitness reports: 7.
  • 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: 9.4675, 100.0503

Questions and answers

Can I swim at Lamai Beach today?

Today's estimated risk is moderate; main factor: calm water and rain. 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 Lamai Beach 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 Lamai Beach?

Based on 2022–2026 weather, the risk is most often elevated in February, March, August. Official warnings nearby: 2.

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.