SnorkelForecast.com

Similan Islands Snorkel Report Today

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

The skinny

Marginal Report Wed 04:09

Similan Islands looks marginal today. The least-bad daylight window is around Wed 08:00, but waves is limiting the forecast.

Score: 4.0/10

Best time: Wed 08:00

Main risk: Waves

Best morning signal: Wed 08:00 (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

29.6°C

Max air

28.4°C

Sky

Clear

16% 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 01:00 — Fair (0.40) · still limited by waves, tide/current
  • Wed 03:00 — Fair (0.40) · still limited by waves, tide/current
  • Wed 02:00 — Fair (0.40) · still limited by waves, wind

Why this verdict

Main blockers across the next 72 hours:

  • Waves (54 hours)
  • Tide/current (54 hours)
  • Wind (37 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

❌ 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

Sun 21:00 – Wed 21:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.23 around Mon 17:00; 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 1.94m to 2.42m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 5.79 to 10.18m/s).

Tides range from -0.26m to 1.61m; 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
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
Mon 02:00 2.16 · high 10.18 · high 29.30 · good poor
Mon 03:00 2.10 · high 9.24 · high 29.30 · good poor
Mon 04:00 2.06 · high 8.67 · high 29.30 · good poor
Mon 05:00 2.00 · high 8.07 · high 29.30 · good poor
Mon 06:00 1.96 · high 7.46 · high 29.30 · good poor
Mon 07:00 1.96 · high 9.19 · high 29.30 · good poor
Mon 08:00 1.94 · high 9.48 · high 29.30 · good poor
Mon 09:00 1.94 · high 8.30 · high 29.30 · good poor
Mon 10:00 1.98 · high 8.50 · high 29.30 · good poor
Mon 11:00 2.02 · high 7.92 · high 29.30 · good poor
Mon 12:00 2.06 · high 8.53 · high 29.30 · good poor
Mon 13:00 2.02 · high 8.83 · high 29.30 · good poor
Mon 14:00 2.00 · high 8.08 · high 29.30 · good poor
Mon 15:00 1.96 · high 8.33 · high 29.30 · good poor
Mon 16:00 1.96 · high 7.88 · high 29.20 · good poor
Mon 17:00 1.94 · high 7.94 · high 29.20 · good poor
Mon 18:00 1.94 · high 8.06 · high 29.20 · good poor
Mon 19:00 1.94 · high 5.79 · high 29.20 · good poor
Mon 20:00 1.96 · high 8.66 · high 29.20 · good poor
Mon 21:00 1.96 · high 8.48 · high 29.20 · good poor
Mon 22:00 1.94 · high 7.08 · high 29.20 · good poor
Mon 23:00 1.94 · high 9.52 · high 29.20 · good poor
Tue 00:00 1.92 · high 8.08 · high 29.20 · good poor
Tue 01:00 1.94 · high 6.74 · high 29.20 · good poor
Tue 02:00 1.94 · high 7.28 · high 29.20 · good poor
Tue 03:00 1.96 · high 10.51 · high 29.20 · good poor
Tue 04:00 1.98 · high 6.94 · high 29.20 · good poor
Tue 05:00 2.00 · high 9.76 · high 29.20 · good poor
Tue 06:00 2.02 · high 8.34 · high 29.20 · good poor
Tue 07:00 2.02 · high 8.10 · high 29.20 · good poor
Tue 08:00 2.02 · high 8.22 · high 29.20 · good poor
Tue 09:00 2.02 · high 9.17 · high 29.20 · good poor
Tue 10:00 2.02 · high 7.50 · high 29.20 · good poor
Tue 11:00 2.00 · high 7.60 · high 29.20 · good poor
Tue 12:00 2.00 · high 7.32 · high 29.20 · good poor
Tue 13:00 1.96 · high 7.42 · high 29.20 · good poor
Tue 14:00 1.94 · high 7.78 · high 29.20 · good poor
Tue 15:00 1.90 · high 7.45 · high 29.20 · good poor
Tue 16:00 1.88 · high 7.32 · high 29.10 · good poor
Tue 17:00 1.84 · high 8.41 · high 29.10 · good poor
Tue 18:00 1.82 · high 7.61 · high 29.10 · good poor
Tue 19:00 1.80 · high 5.10 · good 29.10 · good poor
Tue 20:00 1.78 · high 4.63 · good 29.10 · good poor
Tue 21:00 1.76 · high 6.76 · high 29.10 · good poor
Tue 22:00 1.74 · high 7.24 · high 29.10 · good poor
Tue 23:00 1.74 · high 6.58 · high 29.10 · good poor
Wed 00:00 1.72 · high 7.24 · high 29.10 · good poor
Wed 01:00 1.70 · high 6.69 · high 29.10 · good poor
Wed 02:00 1.68 · high 5.55 · high 29.10 · good poor
Wed 03:00 1.66 · high 6.02 · high 29.10 · good poor
Wed 04:00 1.66 · high 6.18 · high 29.20 · good poor
Wed 05:00 1.64 · high 6.90 · high 29.20 · good poor
Wed 06:00 1.64 · high 4.26 · good 29.20 · good poor
Wed 07:00 1.46 · high 5.70 · high 29.40 · good poor
Wed 08:00 1.46 · high 5.02 · good 29.40 · good poor
Wed 09:00 1.44 · high 4.95 · good 29.40 · good poor
Wed 10:00 1.42 · high 4.82 · good 29.40 · good poor
Wed 11:00 1.42 · high 4.40 · good 29.40 · good poor
Wed 12:00 1.40 · high 4.27 · good 29.40 · good poor
Wed 13:00 1.38 · high 3.86 · good 29.40 · good poor
Wed 14:00 1.38 · high 3.65 · good 29.40 · good poor
Wed 15:00 1.36 · high 3.49 · good 29.40 · good poor
Wed 16:00 1.34 · high 3.70 · good 29.40 · good poor
Wed 17:00 1.30 · high 3.73 · good 29.40 · good poor
Wed 18:00 1.28 · high 3.75 · good 29.40 · good poor
Wed 19:00 1.26 · high 3.40 · good 29.40 · good poor
Wed 20:00 1.26 · high 3.76 · good 29.30 · good poor