SnorkelForecast.com

Similan Islands Snorkel Report Today

Thailand · Updated Tue 04:13 (+07) · Source: Snapshot

The skinny

Marginal Report Wed 09:13

Similan Islands looks marginal today. The least-bad daylight window is around Wed 10:00, but waves is limiting the forecast.

Score: 4.0/10

Best time: Wed 10:00

Main risk: Waves

Best morning signal: Wed 10:00 (Fair).

Best afternoon signal: Wed 14:00 (Fair). Peak afternoon wind is about 6.8 m/s.

Email me when it is good

Sunrise

06:19

Sunset

18:52

Water

29.7°C

Max air

28.4°C

Sky

Clear

7% 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

Wednesday

⚠️ fair conditions

Main blocker: Waves

Thursday

⚠️ fair conditions

Main blocker: Waves

Friday

❌ poor conditions

Main blocker: Waves

Best available hours

  • Wed 03:00 — Fair (0.40) · still limited by waves, tide/current
  • Thu 00:00 — Fair (0.38) · still limited by waves, tide/current
  • Wed 04:00 — Fair (0.38) · still limited by waves, wind

Why this verdict

Main blockers across the next 72 hours:

  • Waves (49 hours)
  • Tide/current (49 hours)
  • Wind (33 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 08:00, Wed 21:00, Thu 09:00, Thu 22:00

Nearby alternatives in Thailand

Surin Islands

89 km away

⚠️ Fair

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 02:00 – Mon 02:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.3 around Fri 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 1.58m to 1.84m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 8.04 to 9.55m/s).

Tides range from -0.01m to 1.29m; 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 02:00 1.80 · high 9.27 · high 29.40 · good poor
Fri 03:00 1.84 · high 9.40 · high 29.40 · good poor
Fri 04:00 1.82 · high 9.11 · high 29.40 · good poor
Fri 05:00 1.80 · high 8.98 · high 29.50 · good poor
Fri 06:00 1.78 · high 8.81 · high 29.50 · good poor
Fri 07:00 1.74 · high 8.66 · high 29.50 · good poor
Fri 08:00 1.70 · high 8.18 · high 29.50 · good poor
Fri 09:00 1.66 · high 8.04 · high 29.50 · good poor
Fri 10:00 1.64 · high 8.24 · high 29.50 · good poor
Fri 11:00 1.62 · high 9.14 · high 29.50 · good poor
Fri 12:00 1.60 · high 8.95 · high 29.50 · good poor
Fri 13:00 1.60 · high 8.70 · high 29.50 · good poor
Fri 14:00 1.58 · high 8.59 · high 29.50 · good poor
Fri 15:00 1.58 · high 8.13 · high 29.50 · good poor
Fri 16:00 1.58 · high 8.13 · high 29.40 · good poor
Fri 17:00 1.58 · high 8.35 · high 29.40 · good poor
Fri 18:00 1.58 · high 8.43 · high 29.40 · good poor
Fri 19:00 1.62 · high 8.49 · high 29.40 · good poor
Fri 20:00 1.66 · high 9.53 · high 29.40 · good poor
Fri 21:00 1.70 · high 9.55 · high 29.40 · good poor
Fri 22:00 1.72 · high 9.38 · high 29.40 · good poor
Fri 23:00 1.76 · high 8.74 · high 29.40 · good poor
Sat 00:00 1.78 · high 8.61 · high 29.40 · good poor
Sat 01:00 1.80 · high 9.00 · high 29.40 · good poor
Sat 02:00 1.80 · high 9.03 · high 29.40 · good poor
Sat 03:00 1.82 · high 9.06 · high 29.40 · good poor
Sat 04:00 1.84 · high 9.01 · high 29.40 · good poor
Sat 05:00 1.84 · high 9.86 · high 29.40 · good poor
Sat 06:00 1.86 · high 9.17 · high 29.40 · good poor
Sat 07:00 1.88 · high 9.75 · high 29.40 · good poor
Sat 08:00 1.90 · high 9.83 · high 29.40 · good poor
Sat 09:00 1.92 · high 10.30 · high 29.40 · good poor
Sat 10:00 1.92 · high 8.80 · high 29.40 · good poor
Sat 11:00 1.92 · high 10.29 · high 29.40 · good poor
Sat 12:00 1.92 · high 10.27 · high 29.40 · good poor
Sat 13:00 1.94 · high 10.80 · high 29.40 · good poor
Sat 14:00 1.98 · high 10.67 · high 29.40 · good poor
Sat 15:00 2.00 · high 10.44 · high 29.40 · good poor
Sat 16:00 2.06 · high 12.37 · high 29.30 · good poor
Sat 17:00 2.10 · high 7.79 · high 29.30 · good poor
Sat 18:00 2.16 · high 11.96 · high 29.30 · good poor
Sat 19:00 2.16 · high 9.55 · high 29.30 · good poor
Sat 20:00 2.16 · high 10.36 · high 29.30 · good poor
Sat 21:00 2.16 · high 11.50 · high 29.30 · good poor
Sat 22:00 2.18 · high 11.49 · high 29.30 · good poor
Sat 23:00 2.20 · high 10.05 · high 29.30 · good poor
Sun 00:00 2.22 · high 10.82 · high 29.30 · good poor
Sun 01:00 2.30 · high 11.13 · high 29.30 · good poor
Sun 02:00 2.38 · high 10.04 · high 29.30 · good poor
Sun 03:00 2.46 · high 9.57 · high 29.30 · good poor
Sun 04:00 2.46 · high 9.79 · high 29.30 · good poor
Sun 05:00 2.48 · high 10.50 · high 29.30 · good poor
Sun 06:00 2.48 · high 10.74 · high 29.30 · good poor
Sun 07:00 2.46 · high 11.65 · high 29.30 · good poor
Sun 08:00 2.36 · high 10.44 · high 29.40 · good poor
Sun 09:00 2.36 · high 10.40 · high 29.40 · good poor
Sun 10:00 2.38 · high 10.27 · high 29.40 · good poor
Sun 11:00 2.38 · high 10.24 · high 29.40 · good poor
Sun 12:00 2.40 · high 10.38 · high 29.40 · good poor
Sun 13:00 2.38 · high 10.08 · high 29.40 · good poor
Sun 14:00 2.36 · high 10.29 · high 29.40 · good poor
Sun 15:00 2.34 · high 10.40 · high 29.40 · good poor
Sun 16:00 2.32 · high 9.31 · high 29.30 · good poor
Sun 17:00 2.32 · high 9.79 · high 29.30 · good poor
Sun 18:00 2.30 · high 9.29 · high 29.30 · good poor
Sun 19:00 2.34 · high 9.69 · high 29.30 · good poor
Sun 20:00 2.38 · high 9.90 · high 29.30 · good poor
Sun 21:00 2.42 · high 7.42 · high 29.30 · good poor
Sun 22:00 2.38 · high 6.94 · high 29.30 · good poor
Sun 23:00 2.32 · high 9.62 · high 29.30 · good poor
Mon 00:00 2.28 · high 9.99 · high 29.30 · good poor
Mon 01:00 2.22 · high 7.63 · high 29.30 · good poor