Jellyfish at Tham Phang Beach (Koh Si Chang)

หาดถ้ำพัง · Koh Si Chang · Gulf of Thailand

Risk today · 24 Oct 2026Moderate

Main factor: Jellyfish season in this area

Conditions or reports nearby make an encounter more likely.

Today the jellyfish risk at Tham Phang Beach (Koh Si Chang) Beach is moderate. Main factor: jellyfish season in this area. 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. TodayModerate4 m/s S — Wind: up to 4 m/s, blowing from S. 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.5 mm — Rain: 5 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  2. TomorrowModerate3 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.4 mm — Rain: 4 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.0.2 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.
  4. Tue 27Low5 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.5 mm — Rain: 5 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  5. Wed 28Moderate4 m/s NE — Wind: up to 4 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.2 mm — Rain: 2 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  6. Thu 29Low3 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.19 mm — Rain: 19 mm in the day. Box jellyfish are more common near river mouths after heavy rain.

Why this level

  • Other jellyfish and stinging plankton Moderateusual background
    jellyfish season in this area, usual for the season
  • Box jellyfish Lowusual background
    calm water and rain, 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 eastern Gulf coast, 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.

Tham Phang Beach (Koh Si Chang): jellyfish month by month

  1. 0%JanJanuary: Usually moderate risk. High risk on 0% of days. Onshore wind on 35% of days. Official warnings: 0.
  2. 6%FebFebruary: Usually moderate risk. High risk on 6% of days. Onshore wind on 65% of days. Official warnings: 0.
  3. 26%MarMarch: Usually moderate risk. High risk on 26% of days. Onshore wind on 75% of days. Official warnings: 0.
  4. 0%AprApril: Usually moderate risk. High risk on 0% of days. Onshore wind on 87% of days. Official warnings: 0.
  5. 0%MayMay: Usually low risk. High risk on 0% of days. Onshore wind on 80% of days. Official warnings: 0.
  6. 0%JunJune: Usually moderate risk. High risk on 0% of days. Onshore wind on 100% of days. Official warnings: 0.
  7. 15%JulJuly: Usually moderate risk. High risk on 15% of days. Onshore wind on 100% of days. Official warnings: 0.
  8. 19%AugAugust: Usually moderate risk. High risk on 19% of days. Onshore wind on 98% of days. Official warnings: 0.
  9. 9%SepSeptember: Usually moderate risk. High risk on 9% of days. Onshore wind on 90% of days. Official warnings: 0.
  10. 21%OctOctober: Usually moderate risk. High risk on 21% of days. Onshore wind on 23% of days. Official warnings: 0.
  11. 0%NovNovember: Usually low risk. High risk on 0% of days. Onshore wind on 5% of days. Official warnings: 0.
  12. 0%DecDecember: Usually low risk. High risk on 0% of days. Onshore wind on 7% of days. Official warnings: 0.
  • typical level that month
  • bar and % — share of high-risk days
  • nofficial warnings, all years

Coordinates: 13.1452, 100.8060

Questions and answers

Can I swim at Tham Phang Beach (Koh Si Chang) today?

Today's estimated risk is moderate; main factor: jellyfish season in this area. 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 Tham Phang Beach (Koh Si Chang) 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 Tham Phang Beach (Koh Si Chang)?

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.