Jellyfish at Sam Roi Yot Beach

หาดสามร้อยยอด · Hua Hin & Pranburi · Gulf of Thailand

Risk today · 24 Oct 2026Moderate

Main factor: Stronger wind than usual

Conditions or reports nearby make an encounter more likely.

Today the jellyfish risk at Sam Roi Yot 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 SW — Wind: up to 3 m/s, blowing from SW. The arrow shows where it blows to. Onshore wind pushes jellyfish to the beach.0.0 m — Waves: up to 0.0 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.
  2. TomorrowModerate4 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.0 mm — Rain: 0 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.3 mm — Rain: 3 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  4. Tue 27Moderate4 m/s N — Wind: up to 4 m/s, blowing from N. The arrow shows where it blows to. Onshore wind pushes jellyfish to the beach.0.5 m — Waves: up to 0.5 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.
  5. Wed 28Moderate4 m/s N — Wind: up to 4 m/s, blowing from N. 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.4 mm — Rain: 4 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  6. Thu 29Low3 m/s N — Wind: up to 3 m/s, blowing from N. 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.8 mm — Rain: 8 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 western Gulf coast, 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.

Sam Roi Yot: jellyfish month by month

  1. 0%Jan1January: Usually moderate risk. High risk on 0% of days. Onshore wind on 80% of days. Official warnings: 0. Eyewitness reports: 1.
  2. 13%Feb2February: Usually moderate risk. High risk on 13% of days. Onshore wind on 44% of days. Official warnings: 0. Eyewitness reports: 2.
  3. 17%MarMarch: Usually moderate risk. High risk on 17% of days. Onshore wind on 23% of days. Official warnings: 0.
  4. 0%AprApril: Usually low risk. High risk on 0% of days. Onshore wind on 14% of days. Official warnings: 0.
  5. 0%May1May: Usually low risk. High risk on 0% of days. Onshore wind on 10% of days. Official warnings: 0. Eyewitness reports: 1.
  6. 0%JunJune: Usually moderate risk. High risk on 0% of days. Onshore wind on 0% of days. Official warnings: 0.
  7. 22%JulJuly: Usually moderate risk. High risk on 22% of days. Onshore wind on 1% of days. Official warnings: 0.
  8. 21%AugAugust: Usually moderate risk. High risk on 21% of days. Onshore wind on 1% of days. Official warnings: 0.
  9. 10%Sep1September: Usually moderate risk. High risk on 10% of days. Onshore wind on 5% of days. Official warnings: 0. Eyewitness reports: 1.
  10. 11%Oct3October: Usually moderate risk. High risk on 11% of days. Onshore wind on 72% of days. Official warnings: 0. Eyewitness reports: 3.
  11. 0%Nov2November: Usually moderate risk. High risk on 0% of days. Onshore wind on 92% of days. Official warnings: 0. Eyewitness reports: 2.
  12. 0%DecDecember: Usually low risk. High risk on 0% of days. Onshore wind on 100% 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: 12.2320, 99.9976

Questions and answers

Can I swim at Sam Roi Yot 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 Sam Roi Yot 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 Sam Roi Yot Beach?

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.