MARINE REPORT / 72 HOURS

Similan Islands Snorkel Report Today

Thailand · Updated Sun 12:14 (+07) · Source: Snapshot

The skinny

Go in the best window Data updated Sun 12:14 (+07)

Similan Islands has a usable snorkeling window around Sun 16:00. The main thing to watch is sea temperature.

Right now (forecast)

Good · 6.1/10

Sun 15:00 (+07)

Later today

Good · 6.2/10

Sun 17:00 (+07)

Next three days

Good · 6.6/10

Mon 11:00 (+07)

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

Score: 6.2/10

Best time: Sun 16:00

Main risk: Sea Temperature

No useful morning window is showing yet.

Best afternoon signal: Sun 17:00 (Good). Peak afternoon wind is about 2.3 m/s.

Email me when it is good

Sunrise

06:17

Sunset

18:11

Water

30.7°C

Max air

27.6°C

Sky

Cloudy

100% cloud

Good model window in the next 72 hours

Next good model window: Sun 16:00–18:00 (35% of the next 72h meets the model threshold)

3-day planner Best available Show data

3-day planner

Sunday

✅ Good conditions

Main blocker: Sea temperature

Monday

✅ Good conditions

Main blocker: Waves

Tuesday

✅ Good conditions

Main blocker: Waves

Best available hours

The next good model window starts at Sun 16:00 and lasts until 18:00.

Why this verdict

Main blockers across the next 72 hours:

  • Waves (60 hours)
  • Darkness (36 hours)
  • Sea temperature (31 hours)

Jellyfish drift risk

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

Low · 28/100

Low drift risk now.

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: 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

Wed 15:00 – Sat 15:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.6 around Thu 07:00; 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.

13/24 sampled hours stay at or below 0.36m (range 0.34m to 0.4m).

Wind is at or below 5.4m/s in 24/24 sampled hours (range 0.56 to 3.57m/s).

Tides range from -0.42m to 1.35m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
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
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Fair ⚠️ Fair
Good 🌟 Good
Good 🌟 Good
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
Good 🌟 Good
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
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
Wed 15:00 0.40 · high 2.80 · good 29.70 · good Fair
Wed 16:00 0.40 · high 3.08 · good 29.70 · good Fair
Wed 17:00 0.40 · high 3.21 · good 29.60 · good Fair
Wed 18:00 0.38 · high 2.93 · good 29.70 · good Fair
Wed 19:00 0.38 · high 3.09 · good 29.60 · good Poor
Wed 20:00 0.38 · high 3.06 · good 29.60 · good Poor
Wed 21:00 0.38 · high 2.77 · good 29.50 · good Poor
Wed 22:00 0.38 · high 3.04 · good 29.50 · good Poor
Wed 23:00 0.34 · good 2.75 · good 29.50 · good Poor
Thu 00:00 0.36 · good 2.62 · good 29.40 · good Poor
Thu 01:00 0.36 · good 3.23 · good 29.40 · good Poor
Thu 02:00 0.36 · good 2.52 · good 29.30 · good Poor
Thu 03:00 0.36 · good 2.15 · good 29.30 · good Poor
Thu 04:00 0.36 · good 1.55 · good 29.30 · good Poor
Thu 05:00 0.36 · good 0.56 · good 29.20 · good Poor
Thu 06:00 0.36 · good 1.42 · good 29.20 · good Poor
Thu 07:00 0.36 · good 0.57 · good 29.20 · good Good
Thu 08:00 0.36 · good 1.85 · good 29.30 · good Good
Thu 09:00 0.36 · good 2.39 · good 29.30 · good Good
Thu 10:00 0.36 · good 2.37 · good 29.40 · good Fair
Thu 11:00 0.36 · good 2.89 · good 29.50 · good Good
Thu 12:00 0.38 · high 2.88 · good 29.60 · good Good
Thu 13:00 0.38 · high 3.27 · good 29.60 · good Fair
Thu 14:00 0.38 · high 3.57 · good 29.60 · good Fair
Thu 15:00 0.38 · high 4.01 · good 29.60 · good Fair
Thu 16:00 0.38 · high 4.08 · good 29.60 · good Fair
Thu 17:00 0.38 · high 3.54 · good 29.60 · good Fair
Thu 18:00 0.38 · high 3.25 · good 29.70 · good Fair
Thu 19:00 0.38 · high 2.85 · good 29.70 · good Poor
Thu 20:00 0.38 · high 2.44 · good 29.60 · good Poor
Thu 21:00 0.38 · high 2.36 · good 29.60 · good Poor
Thu 22:00 0.38 · high 2.95 · good 29.60 · good Poor
Thu 23:00 0.38 · high 2.96 · good 29.50 · good Poor
Fri 00:00 0.38 · high 3.96 · good 29.50 · good Poor
Fri 01:00 0.38 · high 4.28 · good 29.50 · good Poor
Fri 02:00 0.38 · high 4.45 · good 29.40 · good Poor
Fri 03:00 0.38 · high 3.80 · good 29.40 · good Poor
Fri 04:00 0.38 · high 3.11 · good 29.40 · good Poor
Fri 05:00 0.38 · high 2.40 · good 29.40 · good Poor
Fri 06:00 0.38 · high 2.51 · good 29.40 · good Poor
Fri 07:00 0.38 · high 2.93 · good 29.40 · good Good
Fri 08:00 0.38 · high 2.89 · good 29.40 · good Fair
Fri 09:00 0.40 · high 3.06 · good 29.50 · good Fair
Fri 10:00 0.40 · high 3.41 · good 29.60 · good Fair
Fri 11:00 0.40 · high 5.51 · high 29.70 · good Fair
Fri 12:00 0.42 · high 4.58 · good 29.80 · good Fair
Fri 13:00 0.42 · high 3.46 · good 29.80 · good Fair
Fri 14:00 0.42 · high 4.31 · good 29.80 · good Fair
Fri 15:00 0.44 · high 4.34 · good 29.80 · good Fair
Fri 16:00 0.44 · high 4.12 · good 29.80 · good Fair
Fri 17:00 0.44 · high 4.46 · good 29.70 · good Fair
Fri 18:00 0.44 · high 4.21 · good 29.80 · good Fair
Fri 19:00 0.44 · high 4.29 · good 29.70 · good Poor
Fri 20:00 0.44 · high 3.95 · good 29.70 · good Poor
Fri 21:00 0.42 · high 4.37 · good 29.70 · good Poor
Fri 22:00 0.42 · high 5.57 · high 29.70 · good Poor
Fri 23:00 0.42 · high 3.69 · good 29.60 · good Poor
Sat 00:00 0.42 · high 3.86 · good 29.60 · good Poor
Sat 01:00 0.42 · high 3.29 · good 29.60 · good Poor
Sat 02:00 0.42 · high 2.22 · good 29.50 · good Poor
Sat 03:00 0.42 · high 2.24 · good 29.50 · good Poor
Sat 04:00 0.42 · high 2.46 · good 29.50 · good Poor
Sat 05:00 0.42 · high 2.57 · good 29.50 · good Poor
Sat 06:00 0.42 · high 2.60 · good 29.50 · good Poor
Sat 07:00 0.42 · high 2.36 · good 29.50 · good Fair
Sat 08:00 0.42 · high 3.35 · good 29.50 · good Fair
Sat 09:00 0.40 · high 3.81 · good 29.60 · good Fair
Sat 10:00 0.40 · high 3.64 · good 29.70 · good Fair
Sat 11:00 0.40 · high 3.45 · good 29.80 · good Fair
Sat 12:00 0.40 · high 4.25 · good 29.90 · good Fair
Sat 13:00 0.40 · high 2.21 · good 30.00 · good Fair
Sat 14:00 0.40 · high 2.83 · good 30.00 · good Fair