Jellyfish at Choeng Mon Beach

หาดเชิงมน · Koh Samui · 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 Choeng Mon 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 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.9 mm — Rain: 9 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  2. TomorrowLow3 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.0.4 m — Waves: up to 0.4 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.3 mm — Rain: 3 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  3. Tue 27Low5 m/s SE — Wind: up to 5 m/s, blowing from SE. 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.18 mm — Rain: 18 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  4. Wed 28Low4 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.0.3 m — Waves: up to 0.3 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.
  5. Thu 29Low4 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.0.3 m — Waves: up to 0.3 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.33 mm — Rain: 33 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  6. Fri 30Low5 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.25 mm — Rain: 25 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 · waves toward the shore
  • Bluebottles (Portuguese man o’ war) Moderateraises risk
    above usual for the season · stronger wind than usual · steady onshore wind
  • Box jellyfish Lowusual background
    calm water and rain, usual for the season

October is an average month for jellyfish on the Samui archipelago, the wind blows from the sea (~-0.5 m/s), 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.

Choeng Mon: jellyfish month by month

  1. January: Usually low risk. High risk on 1% of days. Onshore wind on 70% of days. Official warnings: 0. Eyewitness reports: 2.
  2. February: Usually moderate risk. High risk on 12% of days. Onshore wind on 26% of days. Official warnings: 0.
  3. March: Usually moderate risk. High risk on 31% of days. Onshore wind on 13% of days. Official warnings: 1. Eyewitness reports: 2.
  4. April: Usually moderate risk. High risk on 19% of days. Onshore wind on 17% of days. Official warnings: 0. Eyewitness reports: 1.
  5. May: Usually moderate risk. High risk on 1% of days. Onshore wind on 10% of days. Official warnings: 0. Eyewitness reports: 2.
  6. June: Usually moderate risk. High risk on 0% of days. Onshore wind on 3% of days. Official warnings: 0. Eyewitness reports: 1.
  7. July: Usually moderate risk. High risk on 0% of days. Onshore wind on 0% of days. Official warnings: 2. Eyewitness reports: 1.
  8. August: Usually moderate risk. High risk on 31% of days. Onshore wind on 2% of days. Official warnings: 0. Eyewitness reports: 1.
  9. September: Usually moderate risk. High risk on 1% of days. Onshore wind on 7% of days. Official warnings: 0. Eyewitness reports: 2.
  10. October: Usually moderate risk. High risk on 0% of days. Onshore wind on 61% of days. Official warnings: 0. Eyewitness reports: 1.
  11. November: Usually moderate risk. High risk on 2% of days. Onshore wind on 83% of days. Official warnings: 0.
  12. December: Usually low risk. High risk on 1% of days. Onshore wind on 98% of days. Official warnings: 0. Eyewitness reports: 1.
  • 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: 9.5730, 100.0839

Questions and answers

Can I swim at Choeng Mon Beach 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 Choeng Mon 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 Choeng Mon Beach?

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

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.