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 01:00 (+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

30.5°C

Max air

27.0°C

Sky

Cloudy

100% cloud

Good model window in the next 72 hours

Next good model window: Mon 07:00–18:00 (17% 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 (70 hours)
  • Darkness (34 hours)
  • Tide/current (25 hours)

Jellyfish drift risk

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

Low · 27/100

Low drift risk now.

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: Mon 02:00

Mon 02:00, 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

Mon 01:00 – Thu 01:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.3 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 1.36m to 1.7m).

Wind is at or below 5.4m/s in 2/24 sampled hours (range 5.12 to 9.26m/s).

Tides range from -0.52m to 1.71m; 1 of 24 hours are in or near peak slack windows.

72-hour historical overview
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Fair ⚠️ Fair
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Poor ❌ Limited
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Fair ⚠️ Fair
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Poor ❌ Limited
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Poor ❌ Limited
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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
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
Mon 03:00 1.66 · high 8.27 · high 28.70 · good Poor
Mon 04:00 1.66 · high 8.05 · high 28.70 · good Poor
Mon 05:00 1.68 · high 7.20 · high 28.70 · good Poor
Mon 06:00 1.68 · high 9.26 · high 28.70 · good Poor
Mon 07:00 1.70 · high 6.75 · high 28.70 · good Poor
Mon 08:00 1.68 · high 7.97 · high 28.70 · good Poor
Mon 09:00 1.64 · high 7.60 · high 28.70 · good Poor
Mon 10:00 1.62 · high 6.40 · high 28.70 · good Poor
Mon 11:00 1.60 · high 7.23 · high 28.70 · good Poor
Mon 12:00 1.56 · high 6.51 · high 28.80 · good Poor
Mon 13:00 1.54 · high 6.76 · high 28.80 · good Poor
Mon 14:00 1.54 · high 6.66 · high 28.80 · good Poor
Mon 15:00 1.54 · high 6.79 · high 28.80 · good Poor
Mon 16:00 1.54 · high 6.84 · high 28.80 · good Poor
Mon 17:00 1.52 · high 6.54 · high 28.80 · good Poor
Mon 18:00 1.54 · high 7.99 · high 28.80 · good Poor
Mon 19:00 1.54 · high 6.05 · high 28.80 · good Poor
Mon 20:00 1.52 · high 5.12 · good 28.80 · good Poor
Mon 21:00 1.48 · high 6.86 · high 28.80 · good Poor
Mon 22:00 1.42 · high 5.24 · good 28.80 · good Poor
Mon 23:00 1.38 · high 5.52 · high 28.70 · good Poor
Tue 00:00 1.36 · high 7.21 · high 28.70 · good Poor
Tue 01:00 1.32 · high 5.93 · high 28.70 · good Poor
Tue 02:00 1.30 · high 3.59 · good 28.70 · good Poor
Tue 03:00 1.26 · high 4.90 · good 28.70 · good Poor
Tue 04:00 1.24 · high 5.50 · high 28.70 · good Poor
Tue 05:00 1.24 · high 5.27 · good 28.70 · good Poor
Tue 06:00 1.24 · high 4.66 · good 28.70 · good Poor
Tue 07:00 1.24 · high 4.05 · good 28.70 · good Poor
Tue 08:00 1.22 · high 4.21 · good 28.70 · good Poor
Tue 09:00 1.20 · high 2.76 · good 28.80 · good Fair
Tue 10:00 1.18 · high 2.86 · good 28.80 · good Fair
Tue 11:00 1.16 · high 2.89 · good 28.90 · good Fair
Tue 12:00 1.14 · high 3.03 · good 29.00 · good Fair
Tue 13:00 1.12 · high 4.14 · good 29.00 · good Poor
Tue 14:00 1.10 · high 3.36 · good 29.00 · good Fair
Tue 15:00 1.06 · high 3.00 · good 29.10 · good Fair
Tue 16:00 1.04 · high 2.92 · good 29.10 · good Fair
Tue 17:00 1.02 · high 2.38 · good 29.00 · good Fair
Tue 18:00 1.00 · high 1.95 · good 29.00 · good Poor
Tue 19:00 0.90 · high 1.26 · good 29.20 · good Poor
Tue 20:00 0.88 · high 1.95 · good 29.20 · good Poor
Tue 21:00 0.88 · high 2.30 · good 29.20 · good Poor
Tue 22:00 0.86 · high 0.85 · good 29.10 · good Poor
Tue 23:00 0.84 · high 1.18 · good 29.10 · good Poor
Wed 00:00 0.84 · high 1.46 · good 29.00 · good Poor
Wed 01:00 0.82 · high 1.63 · good 29.00 · good Poor
Wed 02:00 0.80 · high 0.49 · good 28.90 · good Poor
Wed 03:00 0.80 · high 1.10 · good 28.90 · good Poor
Wed 04:00 0.78 · high 0.88 · good 28.90 · good Poor
Wed 05:00 0.78 · high 2.47 · good 28.90 · good Poor
Wed 06:00 0.76 · high 1.95 · good 28.90 · good Poor
Wed 07:00 0.76 · high 1.32 · good 28.90 · good Fair
Wed 08:00 0.74 · high 2.02 · good 28.90 · good Fair
Wed 09:00 0.74 · high 1.65 · good 29.00 · good Poor
Wed 10:00 0.72 · high 0.97 · good 29.00 · good Fair
Wed 11:00 0.70 · high 1.65 · good 29.10 · good Fair
Wed 12:00 0.70 · high 1.86 · good 29.10 · good Fair
Wed 13:00 0.68 · high 3.87 · good 29.20 · good Poor
Wed 14:00 0.68 · high 1.11 · good 29.20 · good Fair
Wed 15:00 0.66 · high 1.26 · good 29.20 · good Fair
Wed 16:00 0.66 · high 0.86 · good 29.30 · good Fair
Wed 17:00 0.66 · high 2.29 · good 29.30 · good Fair
Wed 18:00 0.62 · high 2.58 · good 29.50 · good Fair
Wed 19:00 0.60 · high 1.01 · good 29.50 · good Poor
Wed 20:00 0.60 · high 1.12 · good 29.50 · good Poor
Wed 21:00 0.58 · high 1.91 · good 29.50 · good Poor
Wed 22:00 0.60 · high 1.05 · good 29.40 · good Poor
Wed 23:00 0.60 · high 1.01 · good 29.40 · good Poor
Thu 00:00 0.58 · high 0.87 · good 29.40 · good Poor