Jellyfish at Chalok Baan Kao Bay

อ่าวโฉลกบ้านเก่า · Koh Tao · Gulf of Thailand

Risk today · 24 Oct 2026Moderate

Main factor: Rain

Conditions or reports nearby make an encounter more likely.

Today the jellyfish risk at Chalok Baan Kao Bay Beach is moderate. Main factor: 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. TodayModerate7 m/s W — Wind: up to 7 m/s, blowing from W. 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.3 mm — Rain: 3 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  2. TomorrowModerate3 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.6 mm — Rain: 6 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  3. Mon 26Moderate7 m/s SE — Wind: up to 7 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.
  4. Tue 27Moderate9 m/s SE — Wind: up to 9 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.22 mm — Rain: 22 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  5. Wed 28Low4 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.4 mm — Rain: 4 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  6. Thu 29Moderate5 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.0.2 m — Waves: up to 0.2 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.29 mm — Rain: 29 mm in the day. Box jellyfish are more common near river mouths after heavy rain.

Why this level

  • Box jellyfish Moderateraises risk
    above usual for the season · rain · waves toward the shore
  • Other jellyfish and stinging plankton Moderateusual background
    jellyfish season in this area, usual for the season
  • Bluebottles (Portuguese man o’ war) Lowlowers risk
    below usual for the season

October is an average month for jellyfish on the Samui archipelago, the wind is light or along the shore, the sea is calm (waves ~0.2 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.

LowModerateHighVery high

Seasonality

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

Chalok Baan Kao Bay: jellyfish month by month

  1. 1%JanJanuary: Usually moderate risk. High risk on 1% of days. Onshore wind on 11% of days. Official warnings: 0.
  2. 5%FebFebruary: Usually moderate risk. High risk on 5% of days. Onshore wind on 34% of days. Official warnings: 0.
  3. 6%Mar1March: Usually moderate risk. High risk on 6% of days. Onshore wind on 61% of days. Official warnings: 0. Eyewitness reports: 1.
  4. 0%AprApril: Usually low risk. High risk on 0% of days. Onshore wind on 81% of days. Official warnings: 0.
  5. 0%MayMay: Usually moderate risk. High risk on 0% of days. Onshore wind on 79% of days. Official warnings: 0.
  6. 0%Jun1June: Usually moderate risk. High risk on 0% of days. Onshore wind on 100% of days. Official warnings: 0. Eyewitness reports: 1.
  7. 17%JulJuly: Usually moderate risk. High risk on 17% of days. Onshore wind on 99% of days. Official warnings: 0.
  8. 8%Aug2August: Usually moderate risk. High risk on 8% of days. Onshore wind on 100% of days. Official warnings: 0. Eyewitness reports: 2.
  9. 1%SepSeptember: Usually moderate risk. High risk on 1% of days. Onshore wind on 95% of days. Official warnings: 0.
  10. 12%OctOctober: Usually moderate risk. High risk on 12% of days. Onshore wind on 43% of days. Official warnings: 0.
  11. 12%NovNovember: Usually moderate risk. High risk on 12% of days. Onshore wind on 16% of days. Official warnings: 0.
  12. 11%DecDecember: Usually moderate risk. High risk on 11% of days. Onshore wind on 0% of days. Official warnings: 0.
  • typical level that month
  • bar and % — share of high-risk days
  • nofficial warnings, all years
  • neyewitness reports, all years

Coordinates: 10.0655, 99.8263

Questions and answers

Can I swim at Chalok Baan Kao Bay today?

Today's estimated risk is moderate; main factor: 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 Chalok Baan Kao Bay 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 Chalok Baan Kao Bay?

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.