MARINE REPORT / 72 HOURS

Similan Islands Snorkel Report Today

Thailand · Updated Mon 04:00 (+07) · Source: Snapshot

The skinny

Go in the best window Data updated Mon 04:00 (+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 06:00 (+07)

Later today

Good · 6.4/10

Mon 15:00 (+07)

Next three days

Good · 6.4/10

Mon 15:00 (+07)

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

Score: 6.4/10

Best time: Mon 07:00

Main risk: Waves

Best morning signal: Mon 11:00 (Good).

Best afternoon signal: Mon 15:00 (Good). Peak afternoon wind is about 1.9 m/s.

Email me when it is good

Sunrise

06:17

Sunset

18:11

Water

30.1°C

Max air

26.7°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 (69 hours)
  • Darkness (33 hours)
  • Tide/current (29 hours)

Jellyfish drift risk

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

Low · 28/100

Low peak drift risk around Tue 06:00.

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: 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

Tue 06:00 – Fri 06:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.44 around Tue 07:00; 11 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 1.02m to 1.06m).

Wind is at or below 5.4m/s in 23/24 sampled hours (range 1.53 to 5.9m/s).

Tides range from 0.08m to 0.98m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Fair ⚠️ Fair
Poor ❌ Limited
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Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
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Fair ⚠️ Fair
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
Tue 06:00 1.04 · high 2.09 · good 28.80 · good Poor
Tue 07:00 1.04 · high 2.49 · good 28.80 · good Fair
Tue 08:00 1.04 · high 1.53 · good 28.80 · good Fair
Tue 09:00 1.04 · high 2.36 · good 28.90 · good Fair
Tue 10:00 1.04 · high 1.67 · good 29.00 · good Fair
Tue 11:00 1.04 · high 1.97 · good 29.10 · good Fair
Tue 12:00 1.04 · high 2.89 · good 29.20 · good Fair
Tue 13:00 1.04 · high 2.84 · good 29.30 · good Fair
Tue 14:00 1.04 · high 2.28 · good 29.30 · good Fair
Tue 15:00 1.04 · high 2.02 · good 29.30 · good Fair
Tue 16:00 1.04 · high 3.50 · good 29.30 · good Fair
Tue 17:00 1.04 · high 3.70 · good 29.30 · good Poor
Tue 18:00 1.02 · high 3.18 · good 29.60 · good Fair
Tue 19:00 1.02 · high 3.69 · good 29.60 · good Poor
Tue 20:00 1.02 · high 5.90 · high 29.50 · good Poor
Tue 21:00 1.04 · high 4.78 · good 29.50 · good Poor
Tue 22:00 1.04 · high 3.76 · good 29.40 · good Poor
Tue 23:00 1.04 · high 5.04 · good 29.30 · good Poor
Wed 00:00 1.06 · high 3.04 · good 29.30 · good Poor
Wed 01:00 1.06 · high 3.04 · good 29.20 · good Poor
Wed 02:00 1.06 · high 3.87 · good 29.20 · good Poor
Wed 03:00 1.04 · high 3.85 · good 29.10 · good Poor
Wed 04:00 1.04 · high 1.90 · good 29.10 · good Poor
Wed 05:00 1.04 · high 3.34 · good 29.10 · good Poor
Wed 06:00 1.04 · high 3.44 · good 29.10 · good Poor
Wed 07:00 1.04 · high 4.65 · good 29.10 · good Poor
Wed 08:00 1.04 · high 3.87 · good 29.10 · good Poor
Wed 09:00 1.04 · high 4.03 · good 29.10 · good Poor
Wed 10:00 1.04 · high 4.55 · good 29.20 · good Poor
Wed 11:00 1.02 · high 4.72 · good 29.20 · good Poor
Wed 12:00 1.02 · high 4.07 · good 29.30 · good Poor
Wed 13:00 1.00 · high 5.53 · high 29.30 · good Poor
Wed 14:00 1.00 · high 4.55 · good 29.30 · good Poor
Wed 15:00 0.98 · high 4.84 · good 29.30 · good Poor
Wed 16:00 0.98 · high 3.11 · good 29.20 · good Fair
Wed 17:00 0.98 · high 3.18 · good 29.20 · good Fair
Wed 18:00 1.04 · high 4.70 · good 29.20 · good Fair
Wed 19:00 1.04 · high 3.75 · good 29.20 · good Poor
Wed 20:00 1.04 · high 5.47 · high 29.20 · good Poor
Wed 21:00 1.04 · high 5.19 · good 29.10 · good Poor
Wed 22:00 1.04 · high 4.67 · good 29.10 · good Poor
Wed 23:00 1.10 · high 5.61 · high 29.10 · good Poor
Thu 00:00 1.10 · high 6.37 · high 29.10 · good Poor
Thu 01:00 1.10 · high 7.07 · high 29.00 · good Poor
Thu 02:00 1.08 · high 6.21 · high 29.00 · good Poor
Thu 03:00 1.08 · high 6.11 · high 29.00 · good Poor
Thu 04:00 1.06 · high 4.49 · good 28.90 · good Poor
Thu 05:00 1.06 · high 5.85 · high 28.90 · good Poor
Thu 06:00 1.06 · high 7.13 · high 28.90 · good Poor
Thu 07:00 1.06 · high 6.37 · high 28.90 · good Poor
Thu 08:00 1.06 · high 6.62 · high 28.90 · good Poor
Thu 09:00 1.04 · high 6.44 · high 28.90 · good Poor
Thu 10:00 1.04 · high 6.40 · high 29.00 · good Poor
Thu 11:00 1.04 · high 5.66 · high 29.00 · good Poor
Thu 12:00 1.02 · high 5.89 · high 29.00 · good Poor
Thu 13:00 1.02 · high 4.53 · good 29.10 · good Poor
Thu 14:00 1.00 · high 3.60 · good 29.10 · good Poor
Thu 15:00 1.00 · high 4.74 · good 29.10 · good Poor
Thu 16:00 0.98 · high 3.90 · good 29.10 · good Poor
Thu 17:00 0.98 · high 3.59 · good 29.10 · good Poor
Thu 18:00 0.98 · high 2.27 · good 29.10 · good Fair
Thu 19:00 0.98 · high 3.13 · good 28.80 · good Poor
Thu 20:00 0.98 · high 2.73 · good 28.80 · good Poor
Thu 21:00 0.96 · high 3.52 · good 28.70 · good Poor
Thu 22:00 0.96 · high 4.11 · good 28.70 · good Poor
Thu 23:00 0.96 · high 4.90 · good 28.70 · good Poor
Fri 00:00 0.94 · high 6.43 · high 28.70 · good Poor
Fri 01:00 0.94 · high 4.54 · good 28.60 · good Poor
Fri 02:00 0.94 · high 3.15 · good 28.60 · good Poor
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