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

The skinny

Marginal Report Tue 16:33

Similan Islands looks marginal today. The least-bad daylight window is around Tue 17:00, but waves is limiting the forecast.

Score: 4.3/10

Best time: Tue 17:00

Main risk: Waves

No useful morning window is showing yet.

Best afternoon signal: Tue 17:00 (Fair). Peak afternoon wind is about 4.8 m/s.

Email me when it is good

Sunrise

06:19

Sunset

18:52

Water

29.9°C

Max air

28.0°C

Sky

Clear

15% 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

Tuesday

⚠️ fair conditions

Main blocker: Waves

Wednesday

⚠️ fair conditions

Main blocker: Waves

Thursday

⚠️ fair conditions

Main blocker: Waves

Best available hours

Tue 10:00 — Fair (0.43) · still limited by waves, tide/current
Wed 01:00 — Fair (0.40) · still limited by waves, tide/current
Wed 03:00 — Fair (0.40) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

Waves (66 hours)
Tide/current (66 hours)
Wind (43 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: Tue 20:00

Tue 20:00, Wed 08:00, Wed 21:00, Thu 09:00, Thu 22:00

Nearby alternatives in Thailand

Surin Islands

89 km away

⚠️ Fair

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 09:00 – Sat 09:00 (+07)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.43 around Thu 14:00; 4 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 1.12m to 1.44m).

Wind is at or below 5.4m/s in 23/24 sampled hours (range 2.08 to 6.62m/s).

Tides range from -0.45m to 1.86m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview

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

Wed 20:00 poor ❌ Limited

Wed 21:00 poor ❌ Limited

Wed 22:00 poor ❌ Limited

Wed 23:00 poor ❌ Limited

Thu 00:00 poor ❌ Limited

Thu 01:00 poor ❌ Limited

Thu 02:00 poor ❌ Limited

Thu 03:00 poor ❌ Limited

Thu 04:00 poor ❌ Limited

Thu 05:00 fair ⚠️ Fair

Thu 06:00 fair ⚠️ Fair

Thu 07:00 fair ⚠️ Fair

Thu 08:00 fair ⚠️ Fair

Thu 09:00 fair ⚠️ Fair

Thu 10:00 fair ⚠️ Fair

Thu 11:00 poor ❌ Limited

Thu 12:00 poor ❌ Limited

Thu 13:00 poor ❌ Limited

Thu 14:00 poor ❌ Limited

Thu 15:00 poor ❌ Limited

Thu 16:00 poor ❌ Limited

Thu 17:00 poor ❌ Limited

Thu 18:00 poor ❌ Limited

Thu 19:00 poor ❌ Limited

Thu 20:00 poor ❌ Limited

Thu 21:00 poor ❌ Limited

Thu 22:00 poor ❌ Limited

Thu 23:00 poor ❌ Limited

Fri 00:00 poor ❌ Limited

Fri 01:00 poor ❌ Limited

Fri 02:00 poor ❌ Limited

Fri 03:00 poor ❌ Limited

Fri 04:00 fair ⚠️ Fair

Fri 05:00 fair ⚠️ Fair

Fri 06:00 fair ⚠️ Fair

Fri 07:00 poor ❌ Limited

Fri 08:00 fair ⚠️ Fair

Fri 09:00 poor ❌ Limited

Fri 10:00 poor ❌ Limited

Fri 11:00 poor ❌ Limited

Fri 12:00 poor ❌ Limited

Fri 13:00 poor ❌ Limited

Fri 14:00 poor ❌ Limited

Fri 15:00 poor ❌ Limited

Fri 16:00 poor ❌ Limited

Fri 17:00 poor ❌ Limited

Fri 18:00 poor ❌ Limited

Fri 19:00 poor ❌ Limited

Fri 20:00 poor ❌ Limited

Fri 21:00 poor ❌ Limited

Fri 22:00 poor ❌ Limited

Fri 23:00 poor ❌ Limited

Sat 00:00 fair ⚠️ Fair

Sat 01:00 poor ❌ Limited

Sat 02:00 poor ❌ Limited

Sat 03:00 poor ❌ Limited

Sat 04:00 fair ⚠️ Fair

Sat 05:00 fair ⚠️ Fair

Sat 06:00 fair ⚠️ Fair

Sat 07:00 fair ⚠️ Fair

Sat 08:00 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 and safety gate (outside daylight scores lower).

Detailed hourly data table

Time	Wave (m)	Wind (m/s)	Sea temp (°C)	Status
Wed 09:00	1.44 · high	4.95 · good	29.40 · good	poor
Wed 10:00	1.42 · high	4.82 · good	29.40 · good	poor
Wed 11:00	1.42 · high	4.40 · good	29.40 · good	poor
Wed 12:00	1.40 · high	4.27 · good	29.40 · good	poor
Wed 13:00	1.38 · high	3.86 · good	29.40 · good	poor
Wed 14:00	1.38 · high	3.65 · good	29.40 · good	poor
Wed 15:00	1.36 · high	3.49 · good	29.40 · good	poor
Wed 16:00	1.34 · high	3.70 · good	29.40 · good	poor
Wed 17:00	1.30 · high	3.73 · good	29.40 · good	poor
Wed 18:00	1.28 · high	3.75 · good	29.40 · good	poor
Wed 19:00	1.26 · high	3.40 · good	29.40 · good	poor
Wed 20:00	1.26 · high	3.76 · good	29.30 · good	poor
Wed 21:00	1.24 · high	3.70 · good	29.30 · good	poor
Wed 22:00	1.22 · high	3.53 · good	29.30 · good	poor
Wed 23:00	1.20 · high	4.00 · good	29.30 · good	poor
Thu 00:00	1.18 · high	3.57 · good	29.30 · good	poor
Thu 01:00	1.18 · high	4.21 · good	29.40 · good	poor
Thu 02:00	1.16 · high	6.62 · high	29.50 · good	poor
Thu 03:00	1.16 · high	4.07 · good	29.60 · good	poor
Thu 04:00	1.16 · high	4.44 · good	29.70 · good	poor
Thu 05:00	1.14 · high	4.05 · good	29.70 · good	fair
Thu 06:00	1.14 · high	3.48 · good	29.80 · good	fair
Thu 07:00	1.14 · high	2.23 · good	29.80 · good	fair
Thu 08:00	1.12 · high	2.08 · good	29.80 · good	fair
Thu 09:00	1.12 · high	2.65 · good	29.70 · good	fair
Thu 10:00	1.12 · high	2.78 · good	29.70 · good	fair
Thu 11:00	1.10 · high	2.96 · good	29.60 · good	poor
Thu 12:00	1.10 · high	3.37 · good	29.60 · good	poor
Thu 13:00	1.08 · high	3.49 · good	29.50 · good	poor
Thu 14:00	1.08 · high	4.48 · good	29.50 · good	poor
Thu 15:00	1.06 · high	3.15 · good	29.50 · good	poor
Thu 16:00	1.06 · high	3.07 · good	29.40 · good	poor
Thu 17:00	1.04 · high	2.24 · good	29.40 · good	poor
Thu 18:00	1.04 · high	1.97 · good	29.40 · good	poor
Thu 19:00	1.04 · high	2.29 · good	29.40 · good	poor
Thu 20:00	1.04 · high	3.34 · good	29.30 · good	poor
Thu 21:00	1.04 · high	3.40 · good	29.30 · good	poor
Thu 22:00	1.04 · high	3.90 · good	29.30 · good	poor
Thu 23:00	1.04 · high	4.39 · good	29.30 · good	poor
Fri 00:00	1.04 · high	4.68 · good	29.30 · good	poor
Fri 01:00	1.04 · high	3.69 · good	29.30 · good	poor
Fri 02:00	1.04 · high	4.75 · good	29.40 · good	poor
Fri 03:00	1.04 · high	4.12 · good	29.40 · good	poor
Fri 04:00	1.04 · high	3.01 · good	29.40 · good	fair
Fri 05:00	1.04 · high	2.45 · good	29.40 · good	fair
Fri 06:00	1.04 · high	3.85 · good	29.40 · good	fair
Fri 07:00	1.04 · high	4.09 · good	29.40 · good	poor
Fri 08:00	1.02 · high	4.20 · good	29.40 · good	fair
Fri 09:00	1.02 · high	7.16 · high	29.40 · good	poor
Fri 10:00	1.02 · high	5.42 · high	29.40 · good	poor
Fri 11:00	1.04 · high	5.65 · high	29.40 · good	poor
Fri 12:00	1.04 · high	5.30 · good	29.40 · good	poor
Fri 13:00	1.04 · high	5.00 · good	29.40 · good	poor
Fri 14:00	1.04 · high	4.47 · good	29.40 · good	poor
Fri 15:00	1.04 · high	3.89 · good	29.40 · good	poor
Fri 16:00	1.04 · high	5.13 · good	29.40 · good	poor
Fri 17:00	1.04 · high	5.58 · high	29.40 · good	poor
Fri 18:00	1.04 · high	5.19 · good	29.40 · good	poor
Fri 19:00	1.04 · high	4.48 · good	29.40 · good	poor
Fri 20:00	1.02 · high	4.85 · good	29.40 · good	poor
Fri 21:00	1.02 · high	4.27 · good	29.30 · good	poor
Fri 22:00	1.02 · high	4.14 · good	29.30 · good	poor
Fri 23:00	1.00 · high	3.31 · good	29.30 · good	poor
Sat 00:00	1.00 · high	4.55 · good	29.30 · good	fair
Sat 01:00	1.02 · high	3.58 · good	29.30 · good	poor
Sat 02:00	1.02 · high	3.39 · good	29.40 · good	poor
Sat 03:00	1.04 · high	2.93 · good	29.40 · good	poor
Sat 04:00	1.04 · high	3.29 · good	29.40 · good	fair
Sat 05:00	1.04 · high	3.75 · good	29.40 · good	fair
Sat 06:00	0.88 · high	3.91 · good	29.80 · good	fair
Sat 07:00	0.88 · high	3.96 · good	29.80 · good	fair
Sat 08:00	0.86 · high	4.25 · good	29.80 · good	fair