Can you snorkel in Similan Islands today?

Conditions look marginal right now — no clearly safe snorkeling window is forecast in Similan Islands over the next 72 hours. Check the hourly table for the calmest period.

What is the best time of day to snorkel in Similan Islands?

Snorkel during daylight, ideally in the morning before the wind picks up, and around high slack tide when water is clearest and currents are weakest. SnorkelForecast scores every daylight hour in Similan Islands so you can pick the calmest window.

What is the best tide for snorkeling?

High slack tide — within about an hour of the high-tide peak when currents are weakest — is the safest, clearest window. Strong low tides, strong tidal flow near channels or headlands, and large tidal-range days reduce score.

Similan Islands Snorkel Report Today

Thailand · Updated Tue 04:13 (+07) · Source: Snapshot · Showing fallback/stale data

The skinny

Marginal Report Thu 03:08

Similan Islands looks marginal today. The least-bad daylight window is around Thu 07:00, but waves is limiting the forecast.

Score: 3.8/10

Best time: Thu 07:00

Main risk: Waves

Best morning signal: Thu 07:00 (Fair).

Best afternoon signal: Thu 12:00 (Poor). Peak afternoon wind is about 6.7 m/s.

Email me when it is good

Sunrise

06:19

Sunset

18:52

Water

29.6°C

Max air

27.5°C

Sky

Cloudy

96% cloud

No safe window in the next 72 hours

Use the best-available section for the least-bad times.

3-day planner Best available Show data

3-day planner

Thursday

⚠️ fair conditions

Main blocker: Waves

Friday

❌ poor conditions

Main blocker: Waves

Best available hours

Thu 00:00 — Fair (0.38) · still limited by waves, tide/current
Thu 04:00 — Poor (0.33) · still limited by waves, tide/current
Thu 05:00 — Poor (0.32) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

Waves (31 hours)
Tide/current (31 hours)
Wind (21 hours)

Jellyfish drift risk

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

Low · 34/100

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: Wed 21:00

Wed 21:00, Thu 09:00, Thu 22:00

Nearby alternatives in Thailand

Surin Islands

89 km away

❌ Poor

Railay

149 km away

✅ Good

Koh Phi Phi

161 km away

✅ Good

Koh Kradan

234 km away

✅ Good

Advanced forecast data

Viewing historical data

Sun 20:00 – Wed 20:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.02 around Mon 14:00; 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 1.4m to 1.52m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 18.7 to 30.9m/s).

Tides range from -0.17m to 1.42m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview

Sun 20:00 poor ❌ Limited

Sun 21:00 poor ❌ Limited

Sun 22:00 poor ❌ Limited

Sun 23:00 poor ❌ Limited

Mon 00:00 poor ❌ Limited

Mon 01:00 poor ❌ Limited

Mon 02:00 poor ❌ Limited

Mon 03:00 poor ❌ Limited

Mon 04:00 poor ❌ Limited

Mon 05:00 poor ❌ Limited

Mon 06:00 poor ❌ Limited

Mon 07:00 poor ❌ Limited

Mon 08:00 poor ❌ Limited

Mon 09:00 poor ❌ Limited

Mon 10:00 poor ❌ Limited

Mon 11:00 poor ❌ Limited

Mon 12:00 poor ❌ Limited

Mon 13:00 poor ❌ Limited

Mon 14:00 poor ❌ Limited

Mon 15:00 poor ❌ Limited

Mon 16:00 poor ❌ Limited

Mon 17:00 poor ❌ Limited

Mon 18:00 poor ❌ Limited

Mon 19:00 poor ❌ Limited

Mon 20:00 poor ❌ Limited

Mon 21:00 poor ❌ Limited

Mon 22:00 poor ❌ Limited

Mon 23:00 poor ❌ Limited

Tue 00:00 poor ❌ Limited

Tue 01:00 poor ❌ Limited

Tue 02:00 poor ❌ Limited

Tue 03:00 poor ❌ Limited

Tue 04:00 poor ❌ Limited

Tue 05:00 poor ❌ Limited

Tue 06:00 poor ❌ Limited

Tue 07:00 poor ❌ Limited

Tue 08:00 poor ❌ Limited

Tue 09:00 poor ❌ Limited

Tue 10:00 poor ❌ Limited

Tue 11:00 poor ❌ Limited

Tue 12:00 poor ❌ Limited

Tue 13:00 poor ❌ Limited

Tue 14:00 poor ❌ Limited

Tue 15:00 poor ❌ Limited

Tue 16:00 poor ❌ Limited

Tue 17:00 poor ❌ Limited

Tue 18:00 poor ❌ Limited

Tue 19:00 poor ❌ Limited

Tue 20:00 poor ❌ Limited

Tue 21:00 poor ❌ Limited

Tue 22:00 poor ❌ Limited

Tue 23:00 poor ❌ Limited

Wed 00:00 poor ❌ Limited

Wed 01:00 poor ❌ Limited

Wed 02:00 poor ❌ Limited

Wed 03:00 poor ❌ Limited

Wed 04:00 poor ❌ Limited

Wed 05:00 poor ❌ Limited

Wed 06:00 poor ❌ Limited

Wed 07:00 poor ❌ Limited

Wed 08:00 poor ❌ Limited

Wed 09:00 poor ❌ Limited

Wed 10:00 poor ❌ Limited

Wed 11:00 poor ❌ Limited

Wed 12:00 poor ❌ Limited

Wed 13:00 poor ❌ Limited

Wed 14:00 poor ❌ Limited

Wed 15:00 poor ❌ Limited

Wed 16:00 poor ❌ Limited

Wed 17:00 poor ❌ Limited

Wed 18:00 poor ❌ Limited

Wed 19:00 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 and safety gate (outside daylight scores lower).

Detailed hourly data table

Time	Wave (m)	Wind (m/s)	Sea temp (°C)	Status
Sun 20:00	1.42 · high	28.40 · high	29.50 · good	poor
Sun 21:00	1.44 · high	23.00 · high	29.50 · good	poor
Sun 22:00	1.46 · high	20.50 · high	29.50 · good	poor
Sun 23:00	1.46 · high	22.90 · high	29.50 · good	poor
Mon 00:00	1.48 · high	29.00 · high	29.50 · good	poor
Mon 01:00	1.48 · high	22.90 · high	29.50 · good	poor
Mon 02:00	1.46 · high	20.80 · high	29.60 · good	poor
Mon 03:00	1.46 · high	26.20 · high	29.60 · good	poor
Mon 04:00	1.44 · high	20.50 · high	29.60 · good	poor
Mon 05:00	1.42 · high	20.30 · high	29.60 · good	poor
Mon 06:00	1.40 · high	18.70 · high	29.60 · good	poor
Mon 07:00	1.42 · high	21.60 · high	29.60 · good	poor
Mon 08:00	1.44 · high	23.60 · high	29.60 · good	poor
Mon 09:00	1.46 · high	30.30 · high	29.60 · good	poor
Mon 10:00	1.46 · high	24.40 · high	29.60 · good	poor
Mon 11:00	1.46 · high	30.50 · high	29.60 · good	poor
Mon 12:00	1.46 · high	25.50 · high	29.60 · good	poor
Mon 13:00	1.46 · high	26.20 · high	29.60 · good	poor
Mon 14:00	1.46 · high	28.20 · high	29.60 · good	poor
Mon 15:00	1.46 · high	30.90 · high	29.60 · good	poor
Mon 16:00	1.48 · high	25.80 · high	29.50 · good	poor
Mon 17:00	1.50 · high	29.10 · high	29.50 · good	poor
Mon 18:00	1.52 · high	25.00 · high	29.50 · good	poor
Mon 19:00	1.52 · high	30.80 · high	29.50 · good	poor
Mon 20:00	1.52 · high	28.10 · high	29.50 · good	poor
Mon 21:00	1.52 · high	19.10 · high	29.50 · good	poor
Mon 22:00	1.50 · high	19.40 · high	29.40 · good	poor
Mon 23:00	1.48 · high	21.00 · high	29.40 · good	poor
Tue 00:00	1.46 · high	21.20 · high	29.40 · good	poor
Tue 01:00	1.44 · high	20.10 · high	29.40 · good	poor
Tue 02:00	1.44 · high	23.80 · high	29.40 · good	poor
Tue 03:00	1.42 · high	22.90 · high	29.40 · good	poor
Tue 04:00	1.42 · high	22.20 · high	29.50 · good	poor
Tue 05:00	1.44 · high	24.80 · high	29.50 · good	poor
Tue 06:00	1.44 · high	25.00 · high	29.50 · good	poor
Tue 07:00	1.46 · high	31.30 · high	29.50 · good	poor
Tue 08:00	1.48 · high	25.30 · high	29.50 · good	poor
Tue 09:00	1.50 · high	29.00 · high	29.50 · good	poor
Tue 10:00	1.56 · high	36.00 · high	29.40 · good	poor
Tue 11:00	1.62 · high	39.80 · high	29.40 · good	poor
Tue 12:00	1.46 · high	29.30 · high	29.50 · good	poor
Tue 13:00	1.46 · high	28.80 · high	29.50 · good	poor
Tue 14:00	1.46 · high	32.70 · high	29.50 · good	poor
Tue 15:00	1.46 · high	39.20 · high	29.50 · good	poor
Tue 16:00	1.50 · high	32.20 · high	29.40 · good	poor
Tue 17:00	1.54 · high	35.80 · high	29.40 · good	poor
Tue 18:00	1.58 · high	34.10 · high	29.40 · good	poor
Tue 19:00	1.70 · high	29.00 · high	29.40 · good	poor
Tue 20:00	1.80 · high	34.70 · high	29.40 · good	poor
Tue 21:00	1.92 · high	40.10 · high	29.40 · good	poor
Tue 22:00	1.94 · high	28.70 · high	29.40 · good	poor
Tue 23:00	1.96 · high	35.40 · high	29.40 · good	poor
Wed 00:00	1.98 · high	37.70 · high	29.40 · good	poor
Wed 01:00	1.98 · high	32.70 · high	29.40 · good	poor
Wed 02:00	1.96 · high	30.10 · high	29.40 · good	poor
Wed 03:00	1.96 · high	32.60 · high	29.40 · good	poor
Wed 04:00	2.00 · high	34.60 · high	29.40 · good	poor
Wed 05:00	2.02 · high	29.10 · high	29.40 · good	poor
Wed 06:00	2.06 · high	29.60 · high	29.40 · good	poor
Wed 07:00	2.04 · high	30.40 · high	29.40 · good	poor
Wed 08:00	2.04 · high	32.10 · high	29.40 · good	poor
Wed 09:00	2.02 · high	40.60 · high	29.40 · good	poor
Wed 10:00	2.00 · high	30.60 · high	29.40 · good	poor
Wed 11:00	1.98 · high	30.40 · high	29.40 · good	poor
Wed 12:00	1.96 · high	31.30 · high	29.40 · good	poor
Wed 13:00	1.94 · high	31.90 · high	29.40 · good	poor
Wed 14:00	1.94 · high	30.90 · high	29.40 · good	poor
Wed 15:00	1.92 · high	30.40 · high	29.40 · good	poor
Wed 16:00	1.98 · high	41.10 · high	29.40 · good	poor
Wed 17:00	2.02 · high	34.70 · high	29.30 · good	poor
Wed 18:00	2.08 · high	37.20 · high	29.30 · good	poor
Wed 19:00	2.08 · high	29.40 · high	29.30 · good	poor