Jellyfish at Ao Yai (Koh Chang Ranong)

อ่าวใหญ่ เกาะช้าง · Koh Chang (Ranong) · Andaman Sea

Risk today · 24 Oct 2026Moderate

Main factor: Rain

Conditions or reports nearby make an encounter more likely.

Today the jellyfish risk at Ao Yai (Koh Chang Ranong) 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.7 mm — Rain: 7 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  2. TomorrowModerate7 m/s SW — Wind: up to 7 m/s, blowing from SW. 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.10 mm — Rain: 10 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  3. Mon 26Moderate4 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.
  4. Tue 27Low6 m/s E — Wind: up to 6 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.8 mm — Rain: 8 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  5. Wed 28Moderate5 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.0.3 m — Waves: up to 0.3 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.15 mm — Rain: 15 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  6. Thu 29Moderate3 m/s E — Wind: up to 3 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.1 mm — Rain: 1 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 · stronger wind than usual
  • Other jellyfish and stinging plankton Lowraises risk
    above usual for the season · stronger wind than usual · waves toward the shore
  • Bluebottles (Portuguese man o’ war) Lowlowers risk
    below usual for the season

It is not jellyfish season in Koh Chang (Ranong), 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.

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Seasonality

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

Ao Yai (Koh Chang Ranong): jellyfish month by month

  1. 0%JanJanuary: Usually moderate risk. High risk on 0% of days. Onshore wind on 6% of days. Official warnings: 0.
  2. 0%FebFebruary: Usually moderate risk. High risk on 0% of days. Onshore wind on 11% of days. Official warnings: 0.
  3. 0%MarMarch: Usually moderate risk. High risk on 0% of days. Onshore wind on 20% of days. Official warnings: 0.
  4. 9%AprApril: Usually moderate risk. High risk on 9% of days. Onshore wind on 57% of days. Official warnings: 0.
  5. 32%MayMay: Usually moderate risk. High risk on 32% of days. Onshore wind on 73% of days. Official warnings: 0.
  6. 17%JunJune: Usually moderate risk. High risk on 17% of days. Onshore wind on 99% of days. Official warnings: 0.
  7. 3%JulJuly: Usually moderate risk. High risk on 3% of days. Onshore wind on 98% of days. Official warnings: 0.
  8. 1%AugAugust: Usually moderate risk. High risk on 1% of days. Onshore wind on 100% of days. Official warnings: 0.
  9. 5%SepSeptember: Usually moderate risk. High risk on 5% of days. Onshore wind on 97% of days. Official warnings: 0.
  10. 0%OctOctober: Usually moderate risk. High risk on 0% of days. Onshore wind on 53% of days. Official warnings: 0.
  11. 0%NovNovember: Usually moderate risk. High risk on 0% of days. Onshore wind on 18% of days. Official warnings: 0.
  12. 0%DecDecember: Usually moderate risk. High risk on 0% 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

Coordinates: 9.8352, 98.4417

Questions and answers

Can I swim at Ao Yai (Koh Chang Ranong) 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 Ao Yai (Koh Chang Ranong) 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 Ao Yai (Koh Chang Ranong)?

Based on 2022–2026 weather, the risk is most often elevated in March, April, May. 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.