SnorkelForecast.com

Similan Islands Snorkel Report Today

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

The skinny

Marginal Report Thu 02:14

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

Cloudy

97% 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 (32 hours)
  • Tide/current (32 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: Wed 21:00

Wed 21:00, 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

Mon 19:00 – Thu 19:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.07 around Tue 14:00; 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 1.42m to 1.62m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 19.1 to 39.8m/s).

Tides range from -0.21m to 1.49m; 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
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
Mon 22:00 1.50 · high 19.40 · high 29.40 · good poor
Mon 23:00 1.48 · high 21.00 · high 29.40 · good poor
Tue 00:00 1.46 · high 21.20 · high 29.40 · good poor
Tue 01:00 1.44 · high 20.10 · high 29.40 · good poor
Tue 02:00 1.44 · high 23.80 · high 29.40 · good poor
Tue 03:00 1.42 · high 22.90 · high 29.40 · good poor
Tue 04:00 1.42 · high 22.20 · high 29.50 · good poor
Tue 05:00 1.44 · high 24.80 · high 29.50 · good poor
Tue 06:00 1.44 · high 25.00 · high 29.50 · good poor
Tue 07:00 1.46 · high 31.30 · high 29.50 · good poor
Tue 08:00 1.48 · high 25.30 · high 29.50 · good poor
Tue 09:00 1.50 · high 29.00 · high 29.50 · good poor
Tue 10:00 1.56 · high 36.00 · high 29.40 · good poor
Tue 11:00 1.62 · high 39.80 · high 29.40 · good poor
Tue 12:00 1.46 · high 29.30 · high 29.50 · good poor
Tue 13:00 1.46 · high 28.80 · high 29.50 · good poor
Tue 14:00 1.46 · high 32.70 · high 29.50 · good poor
Tue 15:00 1.46 · high 39.20 · high 29.50 · good poor
Tue 16:00 1.50 · high 32.20 · high 29.40 · good poor
Tue 17:00 1.54 · high 35.80 · high 29.40 · good poor
Tue 18:00 1.58 · high 34.10 · high 29.40 · good poor
Tue 19:00 1.70 · high 29.00 · high 29.40 · good poor
Tue 20:00 1.80 · high 34.70 · high 29.40 · good poor
Tue 21:00 1.92 · high 40.10 · high 29.40 · good poor
Tue 22:00 1.94 · high 28.70 · high 29.40 · good poor
Tue 23:00 1.96 · high 35.40 · high 29.40 · good poor
Wed 00:00 1.98 · high 37.70 · high 29.40 · good poor
Wed 01:00 1.98 · high 32.70 · high 29.40 · good poor
Wed 02:00 1.96 · high 30.10 · high 29.40 · good poor
Wed 03:00 1.96 · high 32.60 · high 29.40 · good poor
Wed 04:00 2.00 · high 34.60 · high 29.40 · good poor
Wed 05:00 2.02 · high 29.10 · high 29.40 · good poor
Wed 06:00 2.06 · high 29.60 · high 29.40 · good poor
Wed 07:00 2.04 · high 30.40 · high 29.40 · good poor
Wed 08:00 2.04 · high 32.10 · high 29.40 · good poor
Wed 09:00 2.02 · high 40.60 · high 29.40 · good poor
Wed 10:00 2.00 · high 30.60 · high 29.40 · good poor
Wed 11:00 1.98 · high 30.40 · high 29.40 · good poor
Wed 12:00 1.96 · high 31.30 · high 29.40 · good poor
Wed 13:00 1.94 · high 31.90 · high 29.40 · good poor
Wed 14:00 1.94 · high 30.90 · high 29.40 · good poor
Wed 15:00 1.92 · high 30.40 · high 29.40 · good poor
Wed 16:00 1.98 · high 41.10 · high 29.40 · good poor
Wed 17:00 2.02 · high 34.70 · high 29.30 · good poor
Wed 18:00 2.08 · high 37.20 · high 29.30 · good poor
Wed 19:00 2.08 · high 29.40 · high 29.30 · good poor
Wed 20:00 2.08 · high 30.70 · high 29.30 · good poor
Wed 21:00 2.08 · high 29.00 · high 29.30 · good poor
Wed 22:00 2.10 · high 27.50 · high 29.30 · good poor
Wed 23:00 2.10 · high 31.30 · high 29.30 · good poor
Thu 00:00 2.12 · high 24.90 · high 29.30 · good poor
Thu 01:00 2.12 · high 32.60 · high 29.30 · good poor
Thu 02:00 2.14 · high 29.10 · high 29.30 · good poor
Thu 03:00 2.14 · high 27.40 · high 29.30 · good poor
Thu 04:00 2.18 · high 35.70 · high 29.30 · good poor
Thu 05:00 2.24 · high 29.10 · high 29.30 · good poor
Thu 06:00 2.28 · high 33.80 · high 29.30 · good poor
Thu 07:00 2.28 · high 36.30 · high 29.30 · good poor
Thu 08:00 2.28 · high 37.10 · high 29.30 · good poor
Thu 09:00 2.28 · high 30.90 · high 29.30 · good poor
Thu 10:00 2.28 · high 33.10 · high 29.30 · good poor
Thu 11:00 2.26 · high 32.10 · high 29.30 · good poor
Thu 12:00 2.26 · high 30.50 · high 29.30 · good poor
Thu 13:00 2.22 · high 32.70 · high 29.30 · good poor
Thu 14:00 2.18 · high 33.50 · high 29.30 · good poor
Thu 15:00 2.14 · high 29.10 · high 29.30 · good poor
Thu 16:00 2.10 · high 32.40 · high 29.20 · good poor
Thu 17:00 2.08 · high 25.50 · high 29.20 · good poor
Thu 18:00 2.04 · high 27.50 · high 29.20 · good poor