MARINE REPORT / 72 HOURS

Similan Islands Snorkel Report Today

Thailand · Updated Mon 00:52 (+07) · Source: Snapshot

The skinny

Go in the best window Data updated Mon 00:52 (+07)

Similan Islands has a usable snorkeling window around Mon 07:00. The main thing to watch is waves.

Right now (forecast)

Poor · 0.0/10

Mon 03:00 (+07)

Later today

Good · 6.6/10

Mon 15:00 (+07)

Next three days

Good · 6.6/10

Mon 15:00 (+07)

Model estimates using Open-Meteo; not observations or safety guarantees. Check official advisories and conditions at the beach.

Score: 6.6/10

Best time: Mon 07:00

Main risk: Waves

Best morning signal: Mon 09:00 (Good).

Best afternoon signal: Mon 15:00 (Good). Peak afternoon wind is about 1.7 m/s.

Email me when it is good

Sunrise

06:17

Sunset

18:11

Water

30.3°C

Max air

27.0°C

Sky

Cloudy

99% cloud

Good model window in the next 72 hours

Next good model window: Mon 07:00–18:00 (18% of the next 72h meets the model threshold)

3-day planner Best available Show data

3-day planner

Monday

✅ Good conditions

Main blocker: Waves

Tuesday

⚠️ Fair conditions

Main blocker: Waves

Wednesday

⚠️ Fair conditions

Main blocker: Waves

Best available hours

The next good model window starts at Mon 07:00 and lasts until 18:00.

Why this verdict

Main blockers across the next 72 hours:

  • Waves (68 hours)
  • Darkness (32 hours)
  • Tide/current (25 hours)

Jellyfish drift risk

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

Low · 27/100

Low peak drift risk around Mon 05:00.

warm water supports seasonal jellyfish activity; 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: Tue 04:00

Mon 16:00, Tue 04:00, Tue 18:00, Wed 06:00, Wed 19:00

Nearby alternatives in Thailand

Surin Islands

89 km away

✅ Good

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 03:00 – Mon 03:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.4 around Fri 09:00; 6 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 0.84m to 0.98m).

Wind is at or below 5.4m/s in 19/24 sampled hours (range 1.73 to 8.48m/s).

Tides range from -0.43m to 1.46m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
Poor ❌ Limited
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Fair ⚠️ Fair
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Poor ❌ Limited
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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 is better in daylight, so night hours score lower.
Detailed hourly data table
Time Wave (m) Wind (m/s) Sea temp (°C) Status
Fri 03:00 0.94 · high 3.97 · good 28.60 · good Poor
Fri 04:00 0.94 · high 4.05 · good 28.50 · good Poor
Fri 05:00 0.94 · high 3.83 · good 28.50 · good Poor
Fri 06:00 0.94 · high 4.82 · good 28.50 · good Poor
Fri 07:00 0.94 · high 2.00 · good 28.50 · good Fair
Fri 08:00 0.94 · high 2.10 · good 28.50 · good Fair
Fri 09:00 0.92 · high 1.73 · good 28.60 · good Fair
Fri 10:00 0.92 · high 2.89 · good 28.70 · good Fair
Fri 11:00 0.92 · high 4.79 · good 28.80 · good Poor
Fri 12:00 0.94 · high 3.34 · good 28.90 · good Poor
Fri 13:00 0.94 · high 4.62 · good 28.90 · good Poor
Fri 14:00 0.96 · high 4.21 · good 28.90 · good Fair
Fri 15:00 0.96 · high 5.70 · high 28.90 · good Poor
Fri 16:00 0.98 · high 5.34 · good 28.90 · good Poor
Fri 17:00 0.98 · high 4.92 · good 28.80 · good Poor
Fri 18:00 0.84 · high 5.25 · good 28.80 · good Fair
Fri 19:00 0.84 · high 7.54 · high 28.80 · good Poor
Fri 20:00 0.84 · high 5.42 · high 28.80 · good Poor
Fri 21:00 0.84 · high 6.69 · high 28.70 · good Poor
Fri 22:00 0.86 · high 4.47 · good 28.70 · good Poor
Fri 23:00 0.86 · high 4.31 · good 28.70 · good Poor
Sat 00:00 0.86 · high 3.53 · good 28.70 · good Poor
Sat 01:00 0.86 · high 4.43 · good 28.70 · good Poor
Sat 02:00 0.88 · high 8.48 · high 28.70 · good Poor
Sat 03:00 0.90 · high 5.27 · good 28.60 · good Poor
Sat 04:00 0.92 · high 5.01 · good 28.60 · good Poor
Sat 05:00 0.94 · high 6.94 · high 28.60 · good Poor
Sat 06:00 0.98 · high 6.01 · high 28.60 · good Poor
Sat 07:00 1.00 · high 6.29 · high 28.60 · good Poor
Sat 08:00 1.00 · high 5.94 · high 28.60 · good Poor
Sat 09:00 0.98 · high 6.98 · high 28.60 · good Poor
Sat 10:00 0.98 · high 7.87 · high 28.60 · good Poor
Sat 11:00 1.00 · high 5.84 · high 28.70 · good Poor
Sat 12:00 1.02 · high 6.13 · high 28.70 · good Poor
Sat 13:00 1.04 · high 8.32 · high 28.70 · good Poor
Sat 14:00 1.08 · high 5.70 · high 28.70 · good Poor
Sat 15:00 1.10 · high 6.54 · high 28.70 · good Poor
Sat 16:00 1.14 · high 6.01 · high 28.70 · good Poor
Sat 17:00 1.16 · high 5.70 · high 28.70 · good Poor
Sat 18:00 1.00 · high 5.66 · high 28.80 · good Poor
Sat 19:00 0.98 · high 6.90 · high 28.80 · good Poor
Sat 20:00 1.30 · high 6.75 · high 28.80 · good Poor
Sat 21:00 1.24 · high 5.69 · high 28.80 · good Poor
Sat 22:00 1.20 · high 5.85 · high 28.80 · good Poor
Sat 23:00 1.18 · high 5.72 · high 28.80 · good Poor
Sun 00:00 1.18 · high 6.75 · high 28.80 · good Poor
Sun 01:00 1.16 · high 6.41 · high 28.80 · good Poor
Sun 02:00 1.20 · high 7.68 · high 28.80 · good Poor
Sun 03:00 1.22 · high 5.79 · high 28.80 · good Poor
Sun 04:00 1.26 · high 8.91 · high 28.70 · good Poor
Sun 05:00 1.28 · high 8.30 · high 28.70 · good Poor
Sun 06:00 1.28 · high 6.70 · high 28.70 · good Poor
Sun 07:00 1.30 · high 7.76 · high 28.70 · good Poor
Sun 08:00 1.34 · high 8.65 · high 28.70 · good Poor
Sun 09:00 1.36 · high 7.39 · high 28.80 · good Poor
Sun 10:00 1.40 · high 6.65 · high 28.80 · good Poor
Sun 11:00 1.46 · high 7.00 · high 28.80 · good Poor
Sun 12:00 1.50 · high 10.01 · high 28.80 · good Poor
Sun 13:00 1.56 · high 10.06 · high 28.80 · good Poor
Sun 14:00 1.56 · high 9.05 · high 28.80 · good Poor
Sun 15:00 1.58 · high 10.35 · high 28.80 · good Poor
Sun 16:00 1.58 · high 8.40 · high 28.80 · good Poor
Sun 17:00 1.60 · high 8.70 · high 28.80 · good Poor
Sun 18:00 1.68 · high 9.06 · high 28.80 · good Poor
Sun 19:00 1.70 · high 8.77 · high 28.80 · good Poor
Sun 20:00 1.64 · high 8.94 · high 28.80 · good Poor
Sun 21:00 1.66 · high 8.25 · high 28.80 · good Poor
Sun 22:00 1.66 · high 9.32 · high 28.80 · good Poor
Sun 23:00 1.66 · high 7.73 · high 28.70 · good Poor
Mon 00:00 1.68 · high 8.02 · high 28.70 · good Poor
Mon 01:00 1.68 · high 8.63 · high 28.70 · good Poor
Mon 02:00 1.68 · high 9.09 · high 28.70 · good Poor