Jellyfish at Pratumnak (Cosy) Beach

หาดพระตำหนัก · Pattaya · Gulf of Thailand

Risk today · 25 Oct 2026Moderate

Main factor: Jellyfish season in this area

Conditions or reports nearby make an encounter more likely.

Today the jellyfish risk at Pratumnak (Cosy) 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. TodayModerate3 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.2 mm — Rain: 2 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.0.1 m — Waves: up to 0.1 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.
  3. Tue 27Moderate5 m/s NE — Wind: up to 5 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.6 mm — Rain: 6 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  4. Wed 28Moderate5 m/s NE — Wind: up to 5 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.
  5. Thu 29Moderate3 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.17 mm — Rain: 17 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  6. Fri 30Moderate5 m/s NE — Wind: up to 5 m/s, blowing from NE. 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.

Why this level

  • Other jellyfish and stinging plankton Moderateusual background
    jellyfish season in this area, usual for the season
  • Box jellyfish Moderateraises risk
    above usual for the season · rain · steady onshore wind
  • 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 blows offshore, 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.

Pratumnak (Cosy): jellyfish month by month

  1. January: Usually low risk. High risk on 0% of days. Onshore wind on 33% of days. Official warnings: 0.
  2. February: Usually low risk. High risk on 4% of days. Onshore wind on 25% of days. Official warnings: 0. Eyewitness reports: 1.
  3. March: Usually moderate risk. High risk on 3% of days. Onshore wind on 8% of days. Official warnings: 0. Eyewitness reports: 1.
  4. April: Usually low risk. High risk on 0% of days. Onshore wind on 3% of days. Official warnings: 0. Eyewitness reports: 2.
  5. May: Usually low risk. High risk on 0% of days. Onshore wind on 31% of days. Official warnings: 0.
  6. June: Usually moderate risk. High risk on 44% of days. Onshore wind on 83% of days. Official warnings: 0. Eyewitness reports: 2.
  7. July: Usually high risk. High risk on 57% of days. Onshore wind on 83% of days. Official warnings: 0. Eyewitness reports: 5.
  8. August: Usually moderate risk. High risk on 5% of days. Onshore wind on 81% of days. Official warnings: 0. Eyewitness reports: 4.
  9. September: Usually moderate risk. High risk on 5% of days. Onshore wind on 71% of days. Official warnings: 0. Eyewitness reports: 1.
  10. October: Usually moderate risk. High risk on 7% of days. Onshore wind on 32% of days. Official warnings: 0.
  11. November: Usually low risk. High risk on 0% of days. Onshore wind on 26% of days. Official warnings: 0.
  12. December: Usually low risk. High risk on 0% of days. Onshore wind on 30% of days. Official warnings: 0.
  • 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: 12.9212, 100.8577

Questions and answers

Can I swim at Pratumnak (Cosy) Beach 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 Pratumnak (Cosy) 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 Pratumnak (Cosy) Beach?

Based on 2022–2026 weather, the risk is most often elevated in June, July, August. 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.