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 19:00 (+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

30.6°C

Max air

25.8°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

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 (35 hours)
  • Sea temperature (27 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

Fri 19:00 – Mon 19:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.64 around Sat 12:00; 12 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 0.46m to 0.52m).

Wind is at or below 5.4m/s in 24/24 sampled hours (range 0.87 to 3.97m/s).

Tides range from -0.09m to 1.14m; 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
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
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
Fair ⚠️ Fair
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
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
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 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
Fri 22:00 0.48 · high 1.41 · good 29.70 · good Poor
Fri 23:00 0.48 · high 2.18 · good 29.60 · good Poor
Sat 00:00 0.48 · high 2.53 · good 29.60 · good Poor
Sat 01:00 0.48 · high 1.48 · good 29.50 · good Poor
Sat 02:00 0.48 · high 1.59 · good 29.50 · good Poor
Sat 03:00 0.48 · high 3.18 · good 29.40 · good Poor
Sat 04:00 0.48 · high 3.11 · good 29.40 · good Poor
Sat 05:00 0.48 · high 2.93 · good 29.40 · good Poor
Sat 06:00 0.48 · high 1.01 · good 29.40 · good Poor
Sat 07:00 0.48 · high 1.31 · good 29.40 · good Good
Sat 08:00 0.48 · high 0.98 · good 29.40 · good Good
Sat 09:00 0.48 · high 0.87 · good 29.50 · good Good
Sat 10:00 0.48 · high 1.71 · good 29.60 · good Good
Sat 11:00 0.48 · high 1.03 · good 29.70 · good Good
Sat 12:00 0.48 · high 1.40 · good 29.70 · good Good
Sat 13:00 0.48 · high 2.80 · good 29.80 · good Good
Sat 14:00 0.50 · high 3.23 · good 29.80 · good Good
Sat 15:00 0.50 · high 3.20 · good 29.80 · good Good
Sat 16:00 0.52 · high 3.45 · good 29.80 · good Fair
Sat 17:00 0.52 · high 3.43 · good 29.70 · good Fair
Sat 18:00 0.46 · high 3.97 · good 29.70 · good Fair
Sat 19:00 0.46 · high 2.90 · good 29.60 · good Poor
Sat 20:00 0.46 · high 2.76 · good 29.60 · good Poor
Sat 21:00 0.46 · high 2.87 · good 29.60 · good Poor
Sat 22:00 0.46 · high 3.29 · good 29.50 · good Poor
Sat 23:00 0.46 · high 3.11 · good 29.50 · good Poor
Sun 00:00 0.46 · high 3.48 · good 29.50 · good Poor
Sun 01:00 0.46 · high 4.33 · good 29.50 · good Poor
Sun 02:00 0.46 · high 3.91 · good 29.40 · good Poor
Sun 03:00 0.44 · high 4.21 · good 29.40 · good Poor
Sun 04:00 0.44 · high 4.71 · good 29.40 · good Poor
Sun 05:00 0.44 · high 3.97 · good 29.40 · good Poor
Sun 06:00 0.42 · high 3.36 · good 29.40 · good Poor
Sun 07:00 0.42 · high 2.94 · good 29.40 · good Fair
Sun 08:00 0.42 · high 2.77 · good 29.40 · good Fair
Sun 09:00 0.42 · high 2.71 · good 29.50 · good Fair
Sun 10:00 0.42 · high 3.03 · good 29.70 · good Fair
Sun 11:00 0.42 · high 2.20 · good 29.80 · good Fair
Sun 12:00 0.42 · high 1.64 · good 29.90 · good Fair
Sun 13:00 0.42 · high 2.63 · good 29.90 · good Fair
Sun 14:00 0.42 · high 3.58 · good 29.90 · good Fair
Sun 15:00 0.42 · high 3.71 · good 29.90 · good Fair
Sun 16:00 0.42 · high 3.94 · good 29.90 · good Fair
Sun 17:00 0.42 · high 3.72 · good 29.90 · good Fair
Sun 18:00 0.44 · high 3.96 · good 29.80 · good Fair
Sun 19:00 0.44 · high 3.91 · good 29.80 · good Poor
Sun 20:00 0.44 · high 3.76 · good 29.70 · good Poor
Sun 21:00 0.44 · high 3.46 · good 29.70 · good Poor
Sun 22:00 0.44 · high 3.46 · good 29.70 · good Poor
Sun 23:00 0.44 · high 3.23 · good 29.60 · good Poor
Mon 00:00 0.44 · high 3.36 · good 29.60 · good Poor
Mon 01:00 0.42 · high 3.45 · good 29.50 · good Poor
Mon 02:00 0.42 · high 3.87 · good 29.50 · good Poor
Mon 03:00 0.42 · high 4.74 · good 29.40 · good Poor
Mon 04:00 0.42 · high 4.94 · good 29.40 · good Poor
Mon 05:00 0.42 · high 4.54 · good 29.40 · good Poor
Mon 06:00 0.44 · high 4.61 · good 29.40 · good Poor
Mon 07:00 0.44 · high 3.70 · good 29.40 · good Fair
Mon 08:00 0.44 · high 2.80 · good 29.40 · good Fair
Mon 09:00 0.42 · high 3.25 · good 29.50 · good Fair
Mon 10:00 0.42 · high 2.26 · good 29.70 · good Fair
Mon 11:00 0.42 · high 2.32 · good 29.80 · good Fair
Mon 12:00 0.42 · high 3.32 · good 29.90 · good Fair
Mon 13:00 0.42 · high 5.08 · good 29.90 · good Fair
Mon 14:00 0.42 · high 4.14 · good 29.90 · good Fair
Mon 15:00 0.40 · high 4.13 · good 29.90 · good Fair
Mon 16:00 0.40 · high 3.98 · good 29.90 · good Fair
Mon 17:00 0.40 · high 4.22 · good 29.80 · good Fair
Mon 18:00 0.42 · high 4.11 · good 29.80 · good Fair