MARINE REPORT / 72 HOURS

Similan Islands Snorkel Report Today

Thailand · Updated Sun 18:29 (+07) · Source: Snapshot

The skinny

Poor Data updated Sun 18:29 (+07)

Similan Islands has no good model window later today. Check the three-day outlook and official beach advisories.

Right now (forecast)

Poor · 0.0/10

Sun 22:00 (+07)

Later today

No fresh data for this period.

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: 0.0/10

Best time: -

Main risk: Sea Temperature

No useful morning window is showing yet.

No useful afternoon window is showing yet.

Email me when it is good

Sunrise

06:17

Sunset

18:11

Water

30.5°C

Max air

25.5°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

Sunday

❌ Poor conditions

Main blocker: Sea temperature

Monday

✅ Good conditions

Main blocker: Waves

Tuesday

⚠️ 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 (66 hours)
  • Darkness (32 hours)
  • Sea temperature (24 hours)

Jellyfish drift risk

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

Low · 27/100

Low peak drift risk around Mon 06:00.

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: Mon 02:00

Mon 02:00, Mon 16:00, Tue 04:00, Tue 18:00, Wed 06:00

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 22:00 – Fri 22:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.49 around Wed 11:00; 10 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 0.58m to 0.86m).

Wind is at or below 5.4m/s in 24/24 sampled hours (range 0.49 to 3.87m/s).

Tides range from -0.45m to 1.66m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Good 🌟 Good
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Good 🌟 Good
Fair ⚠️ Fair
Good 🌟 Good
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
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 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
Thu 01:00 0.58 · high 0.93 · good 29.30 · good Poor
Thu 02:00 0.58 · high 1.48 · good 29.30 · good Poor
Thu 03:00 0.58 · high 5.00 · good 29.20 · good Poor
Thu 04:00 0.58 · high 2.11 · good 29.20 · good Poor
Thu 05:00 0.58 · high 1.10 · good 29.20 · good Poor
Thu 06:00 0.56 · high 1.83 · good 29.20 · good Poor
Thu 07:00 0.56 · high 2.43 · good 29.20 · good Fair
Thu 08:00 0.56 · high 2.00 · good 29.20 · good Fair
Thu 09:00 0.54 · high 1.85 · good 29.30 · good Good
Thu 10:00 0.54 · high 2.04 · good 29.40 · good Fair
Thu 11:00 0.54 · high 1.08 · good 29.60 · good Fair
Thu 12:00 0.54 · high 0.87 · good 29.70 · good Fair
Thu 13:00 0.54 · high 2.05 · good 29.70 · good Fair
Thu 14:00 0.54 · high 2.20 · good 29.80 · good Fair
Thu 15:00 0.52 · high 2.21 · good 29.80 · good Fair
Thu 16:00 0.52 · high 2.35 · good 29.80 · good Fair
Thu 17:00 0.52 · high 2.41 · good 29.70 · good Fair
Thu 18:00 0.50 · high 2.51 · good 29.70 · good Fair
Thu 19:00 0.50 · high 2.20 · good 29.60 · good Poor
Thu 20:00 0.50 · high 2.40 · good 29.60 · good Poor
Thu 21:00 0.50 · high 2.04 · good 29.50 · good Poor
Thu 22:00 0.50 · high 1.41 · good 29.50 · good Poor
Thu 23:00 0.50 · high 1.35 · good 29.50 · good Poor
Fri 00:00 0.48 · high 0.76 · good 29.40 · good Poor
Fri 01:00 0.48 · high 1.84 · good 29.40 · good Poor
Fri 02:00 0.48 · high 1.15 · good 29.30 · good Poor
Fri 03:00 0.48 · high 1.14 · good 29.30 · good Poor
Fri 04:00 0.48 · high 0.68 · good 29.20 · good Poor
Fri 05:00 0.48 · high 0.47 · good 29.20 · good Poor
Fri 06:00 0.48 · high 0.95 · good 29.20 · good Poor
Fri 07:00 0.48 · high 0.30 · good 29.20 · good Fair
Fri 08:00 0.48 · high 1.10 · good 29.30 · good Fair
Fri 09:00 0.50 · high 1.00 · good 29.40 · good Good
Fri 10:00 0.50 · high 1.01 · good 29.50 · good Fair
Fri 11:00 0.50 · high 0.40 · good 29.60 · good Good
Fri 12:00 0.50 · high 0.54 · good 29.80 · good Fair
Fri 13:00 0.50 · high 1.98 · good 29.80 · good Fair
Fri 14:00 0.50 · high 2.19 · good 29.90 · good Fair
Fri 15:00 0.50 · high 1.63 · good 29.80 · good Fair
Fri 16:00 0.50 · high 1.66 · good 29.80 · good Fair
Fri 17:00 0.50 · high 2.31 · good 29.80 · good Fair
Fri 18:00 0.48 · high 2.20 · good 29.80 · good Fair
Fri 19:00 0.48 · high 2.50 · good 29.80 · good Poor
Fri 20:00 0.48 · high 2.80 · good 29.70 · good Poor
Fri 21:00 0.48 · high 1.82 · good 29.70 · good Poor