SnorkelForecast.com

Similan Islands Snorkel Report Today

Thailand · Updated Tue 04:13 (+07) · Source: Snapshot · Showing fallback/stale data

The skinny

Marginal Report Thu 05:26

Similan Islands looks marginal today. The least-bad daylight window is around Thu 07:00, but waves is limiting the forecast.

Score: 3.8/10

Best time: Thu 07:00

Main risk: Waves

Best morning signal: Thu 07:00 (Fair).

Best afternoon signal: Thu 12:00 (Poor). Peak afternoon wind is about 6.7 m/s.

Email me when it is good

Sunrise

06:19

Sunset

18:52

Water

29.6°C

Max air

27.5°C

Sky

Partly cloudy

34% cloud

No safe window in the next 72 hours

Use the best-available section for the least-bad times.

3-day planner Best available Show data

3-day planner

Thursday

⚠️ fair conditions

Main blocker: Waves

Friday

❌ poor conditions

Main blocker: Waves

Best available hours

  • Thu 00:00 — Fair (0.38) · still limited by waves, tide/current
  • Thu 04:00 — Poor (0.33) · still limited by waves, tide/current
  • Thu 05:00 — Poor (0.32) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

  • Waves (29 hours)
  • Tide/current (29 hours)
  • Wind (21 hours)

Jellyfish drift risk

Drift estimate from wind, swell, current and warm water.

Low · 34/100

Low drift risk now.

warm water supports seasonal jellyfish activity; surface drift/current is noticeable; local shoreline exposure is not mapped yet.

Sightings override the model: if you see small purple jellyfish with long trailing tentacles, treat them as sting-capable and give them space.

Upcoming high tides

Next early morning high tide: Thu 22:00

Thu 09:00, Thu 22:00

Nearby alternatives in Thailand

Surin Islands

89 km away

❌ Poor

Railay

149 km away

✅ Good

Koh Phi Phi

161 km away

✅ Good

Koh Kradan

234 km away

✅ Good

Advanced forecast data

Viewing historical data

Fri 22:00 – Mon 22:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.0 around Sat 05:00; 0 of 24 hours are good, fair, or excellent.

Score trend, higher is better. Excellent ≥ 0.72, good 0.55–0.72, fair 0.35–0.55.

Conditions (24h trends)

Tap a chart to load just that series.

0/24 sampled hours stay at or below 0.36m (range 1.1m to 1.2m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 11.6 to 32.4m/s).

Tides range from -0.01m to 1.28m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
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Scoring methodology (for technical users)

We score each hour from 0 to 1 using daylight and these weighted components:

  • Wave height (35%): best below 0.36m, then decreases as it rises.
  • Wind speed (25%): best below 5.4m/s, lower is better.
  • Sea surface temperature (15%): best within 20.6°C to 30.4°C.
  • Tide and currents (15%): best around slack/high-tide windows.
  • Daylight (10%): visibility and safety gate (outside daylight scores lower).
Detailed hourly data table
Time Wave (m) Wind (m/s) Sea temp (°C) Status
Fri 22:00 1.20 · high 23.70 · high 29.70 · good poor
Fri 23:00 1.18 · high 16.70 · high 29.70 · good poor
Sat 00:00 1.16 · high 18.20 · high 29.70 · good poor
Sat 01:00 1.14 · high 11.60 · high 29.70 · good poor
Sat 02:00 1.14 · high 13.80 · high 29.70 · good poor
Sat 03:00 1.12 · high 18.60 · high 29.70 · good poor
Sat 04:00 1.12 · high 32.40 · high 29.80 · good poor
Sat 05:00 1.14 · high 22.60 · high 29.80 · good poor
Sat 06:00 1.14 · high 23.50 · high 29.80 · good poor
Sat 07:00 1.12 · high 21.80 · high 29.80 · good poor
Sat 08:00 1.12 · high 24.20 · high 29.80 · good poor
Sat 09:00 1.10 · high 29.90 · high 29.80 · good poor
Sat 10:00 1.10 · high 21.20 · high 29.80 · good poor
Sat 11:00 1.10 · high 21.60 · high 29.80 · good poor
Sat 12:00 1.10 · high 22.00 · high 29.80 · good poor
Sat 13:00 1.10 · high 25.00 · high 29.80 · good poor
Sat 14:00 1.12 · high 24.80 · high 29.70 · good poor
Sat 15:00 1.12 · high 21.30 · high 29.70 · good poor
Sat 16:00 1.14 · high 20.70 · high 29.70 · good poor
Sat 17:00 1.14 · high 21.40 · high 29.70 · good poor
Sat 18:00 1.16 · high 24.30 · high 29.70 · good poor
Sat 19:00 1.16 · high 19.40 · high 29.70 · good poor
Sat 20:00 1.16 · high 20.20 · high 29.60 · good poor
Sat 21:00 1.16 · high 19.80 · high 29.60 · good poor
Sat 22:00 1.16 · high 14.10 · high 29.60 · good poor
Sat 23:00 1.16 · high 17.70 · high 29.60 · good poor
Sun 00:00 1.16 · high 17.20 · high 29.60 · good poor
Sun 01:00 1.16 · high 25.10 · high 29.60 · good poor
Sun 02:00 1.16 · high 22.70 · high 29.60 · good poor
Sun 03:00 1.16 · high 19.70 · high 29.60 · good poor
Sun 04:00 1.18 · high 20.20 · high 29.60 · good poor
Sun 05:00 1.18 · high 25.30 · high 29.70 · good poor
Sun 06:00 1.20 · high 19.40 · high 29.70 · good poor
Sun 07:00 1.22 · high 22.70 · high 29.70 · good poor
Sun 08:00 1.24 · high 24.10 · high 29.70 · good poor
Sun 09:00 1.26 · high 22.40 · high 29.70 · good poor
Sun 10:00 1.28 · high 24.80 · high 29.70 · good poor
Sun 11:00 1.28 · high 22.50 · high 29.70 · good poor
Sun 12:00 1.30 · high 21.60 · high 29.70 · good poor
Sun 13:00 1.32 · high 21.40 · high 29.70 · good poor
Sun 14:00 1.36 · high 36.10 · high 29.60 · good poor
Sun 15:00 1.38 · high 27.30 · high 29.60 · good poor
Sun 16:00 1.38 · high 25.40 · high 29.60 · good poor
Sun 17:00 1.40 · high 23.20 · high 29.60 · good poor
Sun 18:00 1.40 · high 22.80 · high 29.60 · good poor
Sun 19:00 1.42 · high 24.10 · high 29.60 · good poor
Sun 20:00 1.42 · high 28.40 · high 29.50 · good poor
Sun 21:00 1.44 · high 23.00 · high 29.50 · good poor
Sun 22:00 1.46 · high 20.50 · high 29.50 · good poor
Sun 23:00 1.46 · high 22.90 · high 29.50 · good poor
Mon 00:00 1.48 · high 29.00 · high 29.50 · good poor
Mon 01:00 1.48 · high 22.90 · high 29.50 · good poor
Mon 02:00 1.46 · high 20.80 · high 29.60 · good poor
Mon 03:00 1.46 · high 26.20 · high 29.60 · good poor
Mon 04:00 1.44 · high 20.50 · high 29.60 · good poor
Mon 05:00 1.42 · high 20.30 · high 29.60 · good poor
Mon 06:00 1.40 · high 18.70 · high 29.60 · good poor
Mon 07:00 1.42 · high 21.60 · high 29.60 · good poor
Mon 08:00 1.44 · high 23.60 · high 29.60 · good poor
Mon 09:00 1.46 · high 30.30 · high 29.60 · good poor
Mon 10:00 1.46 · high 24.40 · high 29.60 · good poor
Mon 11:00 1.46 · high 30.50 · high 29.60 · good poor
Mon 12:00 1.46 · high 25.50 · high 29.60 · good poor
Mon 13:00 1.46 · high 26.20 · high 29.60 · good poor
Mon 14:00 1.46 · high 28.20 · high 29.60 · good poor
Mon 15:00 1.46 · high 30.90 · high 29.60 · good poor
Mon 16:00 1.48 · high 25.80 · high 29.50 · good poor
Mon 17:00 1.50 · high 29.10 · high 29.50 · good poor
Mon 18:00 1.52 · high 25.00 · high 29.50 · good poor
Mon 19:00 1.52 · high 30.80 · high 29.50 · good poor
Mon 20:00 1.52 · high 28.10 · high 29.50 · good poor
Mon 21:00 1.52 · high 19.10 · high 29.50 · good poor