MARINE REPORT / 72 HOURS

Similan Islands Snorkel Report Today

Thailand · Updated Mon 07:08 (+07) · Source: Snapshot

The skinny

Go in the best window Data updated Mon 07:08 (+07)

Similan Islands has a usable snorkeling window around Mon 10:00. The main thing to watch is waves.

Right now (forecast)

Good · 6.1/10

Mon 09:00 (+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 10:00

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

30.4°C

Max air

26.7°C

Sky

Cloudy

100% cloud

Good model window in the next 72 hours

Next good model window: Mon 10:00–18:00 (19% 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

✅ Good conditions

Main blocker: Waves

Wednesday

⚠️ Fair conditions

Main blocker: Waves

Best available hours

The next good model window starts at Mon 10:00 and lasts until 18:00.

Why this verdict

Main blockers across the next 72 hours:

  • Waves (69 hours)
  • Darkness (36 hours)
  • Tide/current (32 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

Sat 09:00 – Tue 09:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.31 around Sun 08:00; 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 1.92m to 2.44m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 7.15 to 10.57m/s).

Tides range from 0.23m to 0.79m; 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 is better in daylight, so night hours score lower.
Detailed hourly data table
Time Wave (m) Wind (m/s) Sea temp (°C) Status
Sat 09:00 2.42 · high 8.35 · high 29.00 · good Poor
Sat 10:00 2.44 · high 8.08 · high 29.00 · good Poor
Sat 11:00 2.42 · high 8.20 · high 29.00 · good Poor
Sat 12:00 2.42 · high 9.37 · high 29.00 · good Poor
Sat 13:00 2.40 · high 9.98 · high 29.00 · good Poor
Sat 14:00 2.38 · high 9.19 · high 29.00 · good Poor
Sat 15:00 2.36 · high 10.06 · high 29.00 · good Poor
Sat 16:00 2.34 · high 8.63 · high 29.00 · good Poor
Sat 17:00 2.32 · high 9.02 · high 29.00 · good Poor
Sat 18:00 1.98 · high 9.13 · high 29.00 · good Poor
Sat 19:00 1.96 · high 8.83 · high 29.00 · good Poor
Sat 20:00 1.94 · high 9.93 · high 29.00 · good Poor
Sat 21:00 1.94 · high 9.36 · high 29.00 · good Poor
Sat 22:00 1.92 · high 9.05 · high 29.00 · good Poor
Sat 23:00 1.94 · high 10.57 · high 28.90 · good Poor
Sun 00:00 1.98 · high 10.55 · high 28.90 · good Poor
Sun 01:00 2.08 · high 10.28 · high 28.90 · good Poor
Sun 02:00 2.08 · high 9.49 · high 28.90 · good Poor
Sun 03:00 2.08 · high 8.80 · high 28.90 · good Poor
Sun 04:00 2.08 · high 9.84 · high 28.90 · good Poor
Sun 05:00 2.08 · high 7.15 · high 28.90 · good Poor
Sun 06:00 2.06 · high 8.72 · high 28.90 · good Poor
Sun 07:00 2.06 · high 7.70 · high 28.90 · good Poor
Sun 08:00 2.02 · high 7.15 · high 28.90 · good Poor
Sun 09:00 1.98 · high 5.83 · high 28.90 · good Poor
Sun 10:00 1.94 · high 5.95 · high 28.90 · good Poor
Sun 11:00 1.90 · high 5.82 · high 28.90 · good Fair
Sun 12:00 1.88 · high 4.92 · good 28.90 · good Fair
Sun 13:00 1.84 · high 6.11 · high 28.90 · good Poor
Sun 14:00 1.82 · high 5.24 · good 28.90 · good Fair
Sun 15:00 1.78 · high 5.71 · high 28.90 · good Fair
Sun 16:00 1.76 · high 4.98 · good 28.90 · good Fair
Sun 17:00 1.72 · high 4.73 · good 28.90 · good Fair
Sun 18:00 1.56 · high 3.10 · good 28.80 · good Poor
Sun 19:00 1.56 · high 3.75 · good 28.80 · good Poor
Sun 20:00 1.54 · high 2.89 · good 28.80 · good Poor
Sun 21:00 1.52 · high 3.08 · good 28.80 · good Poor
Sun 22:00 1.44 · high 2.53 · good 28.80 · good Poor
Sun 23:00 1.42 · high 2.04 · good 28.80 · good Poor
Mon 00:00 1.42 · high 2.42 · good 28.80 · good Poor
Mon 01:00 1.40 · high 2.16 · good 28.80 · good Poor
Mon 02:00 1.38 · high 2.55 · good 28.80 · good Poor
Mon 03:00 1.36 · high 2.08 · good 28.80 · good Poor
Mon 04:00 1.34 · high 2.51 · good 28.80 · good Poor
Mon 05:00 1.34 · high 2.44 · good 28.80 · good Poor
Mon 06:00 1.32 · high 3.31 · good 28.80 · good Poor
Mon 07:00 1.32 · high 3.91 · good 28.90 · good Poor
Mon 08:00 1.32 · high 4.28 · good 28.90 · good Poor
Mon 09:00 1.30 · high 3.70 · good 29.00 · good Fair
Mon 10:00 1.30 · high 3.74 · good 29.10 · good Fair
Mon 11:00 1.28 · high 4.39 · good 29.20 · good Fair
Mon 12:00 1.26 · high 4.53 · good 29.20 · good Fair
Mon 13:00 1.24 · high 3.19 · good 29.30 · good Fair
Mon 14:00 1.22 · high 2.97 · good 29.30 · good Fair
Mon 15:00 1.22 · high 1.94 · good 29.30 · good Fair
Mon 16:00 1.20 · high 0.92 · good 29.30 · good Fair
Mon 17:00 1.18 · high 0.68 · good 29.30 · good Fair
Mon 18:00 1.12 · high 1.50 · good 29.20 · good Fair
Mon 19:00 1.10 · high 1.76 · good 29.20 · good Poor
Mon 20:00 1.08 · high 1.90 · good 29.20 · good Poor
Mon 21:00 1.08 · high 0.84 · good 29.10 · good Poor
Mon 22:00 1.06 · high 1.87 · good 29.10 · good Poor
Mon 23:00 1.12 · high 1.00 · good 29.00 · good Poor
Tue 00:00 1.12 · high 0.95 · good 29.00 · good Poor
Tue 01:00 1.10 · high 1.70 · good 28.90 · good Poor
Tue 02:00 1.08 · high 1.10 · good 28.90 · good Poor
Tue 03:00 1.08 · high 1.86 · good 28.80 · good Poor
Tue 04:00 1.06 · high 2.30 · good 28.80 · good Poor
Tue 05:00 1.06 · high 2.69 · good 28.80 · good Poor
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