Jellyfish at Saeng Chan Beach

หาดแสงจันทร์ · Rayong · Gulf of Thailand

Risk today · 25 Oct 2026Moderate

Main factor: Rain

Conditions or reports nearby make an encounter more likely.

Today the jellyfish risk at Saeng Chan 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. TodayModerate4 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.1 mm — Rain: 1 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  2. TomorrowModerate4 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.7 mm — Rain: 7 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  3. Tue 27Moderate3 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.5 mm — Rain: 5 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  4. Wed 28Moderate3 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.2 mm — Rain: 2 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  5. Thu 29Moderate2 m/s NE — Wind: up to 2 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.10 mm — Rain: 10 mm in the day. Box jellyfish are more common near river mouths after heavy rain.
  6. Fri 30Moderate3 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.0.1 m — Waves: up to 0.1 m during the day. Strong onshore waves wash jellyfish ashore; box jellyfish prefer calm water.11 mm — Rain: 11 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 · onshore wind
  • 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 eastern Gulf coast, the wind is light or along the shore, the sea is calm (waves ~0.3 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.

Saeng Chan: jellyfish month by month

  1. January: Usually moderate risk. High risk on 0% of days. Onshore wind on 38% of days. Official warnings: 0.
  2. February: Usually moderate risk. High risk on 8% of days. Onshore wind on 70% of days. Official warnings: 0.
  3. March: Usually moderate risk. High risk on 11% of days. Onshore wind on 85% of days. Official warnings: 0.
  4. April: Usually low risk. High risk on 0% of days. Onshore wind on 91% of days. Official warnings: 0.
  5. May: Usually low risk. High risk on 0% of days. Onshore wind on 94% of days. Official warnings: 0.
  6. June: Usually moderate risk. High risk on 1% of days. Onshore wind on 100% of days. Official warnings: 0.
  7. July: Usually moderate risk. High risk on 25% of days. Onshore wind on 100% of days. Official warnings: 0.
  8. August: Usually moderate risk. High risk on 29% of days. Onshore wind on 99% of days. Official warnings: 0.
  9. September: Usually moderate risk. High risk on 8% of days. Onshore wind on 87% of days. Official warnings: 0.
  10. October: Usually moderate risk. High risk on 23% of days. Onshore wind on 24% of days. Official warnings: 0.
  11. November: Usually low risk. High risk on 0% of days. Onshore wind on 8% of days. Official warnings: 0.
  12. December: Usually low risk. High risk on 0% of days. Onshore wind on 3% 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: 12.6634, 101.2402

Questions and answers

Can I swim at Saeng Chan Beach 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 Saeng Chan 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 Saeng Chan 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.