MARINE REPORT / 72 HOURS

Similan Islands Snorkel Report Today

Thailand · Updated Sun 05:59 (+07) · Source: Snapshot

The skinny

Go in the best window Data updated Sun 05:59 (+07)

Similan Islands has a usable snorkeling window around Sun 07:00. The main thing to watch is sea temperature.

Right now (forecast)

Poor · 0.0/10

Sun 06:00 (+07)

Later today

Good · 6.7/10

Sun 13:00 (+07)

Next three days

Good · 6.7/10

Sun 13:00 (+07)

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

Score: 6.7/10

Best time: Sun 07:00

Main risk: Sea Temperature

Best morning signal: Sun 10:00 (Good).

Best afternoon signal: Sun 13:00 (Good). Peak afternoon wind is about 1.6 m/s.

Email me when it is good

Sunrise

06:17

Sunset

18:11

Water

30.3°C

Max air

27.8°C

Sky

Cloudy

80% cloud

Good model window in the next 72 hours

Next good model window: Sun 07:00–18:00 (46% 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 07:00 and lasts until 18:00.

Why this verdict

Main blockers across the next 72 hours:

  • Waves (56 hours)
  • Sea temperature (37 hours)
  • Darkness (34 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

Sun 14:00, Mon 02:00, Mon 16:00, Tue 04:00, Tue 18:00

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 06:00 – Mon 06:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.6 around Fri 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 0.4m to 0.46m).

Wind is at or below 5.4m/s in 24/24 sampled hours (range 1.01 to 2.5m/s).

Tides range from -0.19m to 1.09m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
Poor ❌ Limited
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
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
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
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
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
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
Fri 06:00 0.46 · high 2.35 · good 30.00 · good Poor
Fri 07:00 0.46 · high 1.73 · good 30.10 · good Good
Fri 08:00 0.46 · high 1.50 · good 30.10 · good Good
Fri 09:00 0.46 · high 1.72 · good 30.30 · good Good
Fri 10:00 0.46 · high 1.58 · good 30.40 · good Good
Fri 11:00 0.46 · high 1.26 · good 30.50 · out of range Good
Fri 12:00 0.44 · high 1.01 · good 30.60 · out of range Good
Fri 13:00 0.44 · high 1.37 · good 30.70 · out of range Good
Fri 14:00 0.44 · high 1.88 · good 30.80 · out of range Fair
Fri 15:00 0.42 · high 1.11 · good 30.60 · out of range Fair
Fri 16:00 0.42 · high 1.41 · good 30.60 · out of range Fair
Fri 17:00 0.42 · high 1.39 · good 30.50 · out of range Fair
Fri 18:00 0.42 · high 1.91 · good 30.50 · out of range Fair
Fri 19:00 0.42 · high 1.79 · good 30.50 · out of range Poor
Fri 20:00 0.42 · high 1.60 · good 30.40 · good Poor
Fri 21:00 0.40 · high 2.18 · good 30.40 · good Poor
Fri 22:00 0.40 · high 2.04 · good 30.30 · good Poor
Fri 23:00 0.40 · high 1.73 · good 30.30 · good Poor
Sat 00:00 0.40 · high 2.10 · good 30.20 · good Poor
Sat 01:00 0.40 · high 1.95 · good 30.20 · good Poor
Sat 02:00 0.40 · high 2.38 · good 30.10 · good Poor
Sat 03:00 0.40 · high 2.03 · good 30.10 · good Poor
Sat 04:00 0.40 · high 1.66 · good 30.00 · good Poor
Sat 05:00 0.40 · high 2.50 · good 30.00 · good Poor
Sat 06:00 0.40 · high 0.95 · good 30.00 · good Poor
Sat 07:00 0.40 · high 1.60 · good 30.00 · good Good
Sat 08:00 0.40 · high 2.14 · good 30.10 · good Good
Sat 09:00 0.38 · high 2.30 · good 30.20 · good Good
Sat 10:00 0.38 · high 2.41 · good 30.30 · good Good
Sat 11:00 0.38 · high 2.84 · good 30.40 · good Fair
Sat 12:00 0.38 · high 2.75 · good 30.50 · out of range Fair
Sat 13:00 0.38 · high 1.77 · good 30.60 · out of range Fair
Sat 14:00 0.38 · high 1.50 · good 30.60 · out of range Fair
Sat 15:00 0.38 · high 1.99 · good 30.60 · out of range Fair
Sat 16:00 0.36 · good 2.63 · good 30.50 · out of range Fair
Sat 17:00 0.36 · good 2.57 · good 30.50 · out of range Fair
Sat 18:00 0.36 · good 2.39 · good 30.50 · out of range Fair
Sat 19:00 0.36 · good 2.48 · good 30.40 · good Poor
Sat 20:00 0.36 · good 1.88 · good 30.40 · good Poor
Sat 21:00 0.34 · good 1.79 · good 30.40 · good Poor
Sat 22:00 0.34 · good 1.46 · good 30.30 · good Poor
Sat 23:00 0.34 · good 1.86 · good 30.30 · good Poor
Sun 00:00 0.34 · good 2.40 · good 30.20 · good Poor
Sun 01:00 0.34 · good 3.07 · good 30.20 · good Poor
Sun 02:00 0.34 · good 4.07 · good 30.10 · good Poor
Sun 03:00 0.34 · good 3.81 · good 30.10 · good Poor
Sun 04:00 0.34 · good 2.57 · good 30.00 · good Poor
Sun 05:00 0.38 · high 1.60 · good 29.90 · good Poor
Sun 06:00 0.38 · high 1.94 · good 29.90 · good Poor
Sun 07:00 0.36 · good 1.66 · good 29.90 · good Good
Sun 08:00 0.36 · good 1.31 · good 30.00 · good Good
Sun 09:00 0.34 · good 1.25 · good 30.10 · good Good
Sun 10:00 0.34 · good 0.65 · good 30.20 · good Good
Sun 11:00 0.34 · good 0.76 · good 30.30 · good Good
Sun 12:00 0.34 · good 1.39 · good 30.50 · out of range Good
Sun 13:00 0.34 · good 2.33 · good 30.50 · out of range Good
Sun 14:00 0.34 · good 2.86 · good 30.60 · out of range Good
Sun 15:00 0.34 · good 3.76 · good 30.50 · out of range Good
Sun 16:00 0.34 · good 2.97 · good 30.50 · out of range Good
Sun 17:00 0.34 · good 2.46 · good 30.60 · out of range Good
Sun 18:00 0.34 · good 2.19 · good 30.60 · out of range Good
Sun 19:00 0.34 · good 1.84 · good 30.50 · out of range Poor
Sun 20:00 0.34 · good 1.84 · good 30.50 · out of range Poor
Sun 21:00 0.34 · good 1.19 · good 30.50 · out of range Poor
Sun 22:00 0.34 · good 1.70 · good 30.40 · good Poor
Sun 23:00 0.34 · good 2.02 · good 30.40 · good Poor
Mon 00:00 0.34 · good 2.23 · good 30.40 · good Poor
Mon 01:00 0.34 · good 0.56 · good 30.30 · good Poor
Mon 02:00 0.34 · good 0.40 · good 30.30 · good Poor
Mon 03:00 0.34 · good 0.85 · good 30.20 · good Poor
Mon 04:00 0.34 · good 0.94 · good 30.20 · good Poor
Mon 05:00 0.34 · good 1.63 · good 30.20 · good Poor