Can you snorkel in Kerama Islands today?

Yes. The next good snorkeling window in Kerama Islands starts Wed 00:00 and lasts until 01:00. Around 30% of the next 72 hours are suitable.

What is the best time of day to snorkel in Kerama 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 Kerama 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.

Kerama Islands Snorkel Report Today

Japan · Updated Tue 04:14 (JST) · Source: Snapshot

The skinny

Go in the best window Report Tue 18:52

Kerama Islands has a usable snorkeling window around Wed 09:00. The main thing to watch is waves.

Score: 6.3/10

Best time: Wed 09:00

Main risk: Waves

No useful morning window is showing yet.

Best afternoon signal: Tue 19:00 (Fair). Peak afternoon wind is about 2.3 m/s.

Email me when it is good

Sunrise

05:50

Sunset

19:23

Water

28.9°C

Max air

28.0°C

Sky

Clear

9% cloud

Good window is available today

Next safe window: Wed 00:00–01:00 (30% of next 72h are suitable)

3-day planner Best available Show data

3-day planner

Tuesday

⚠️ fair conditions

Main blocker: Waves

Wednesday

✅ good conditions

Main blocker: Waves

Thursday

✅ good conditions

Main blocker: Waves

Best available hours

Next safe window starts at Wed 00:00 until 01:00.

Why this verdict

Main blockers across the next 72 hours:

Waves (66 hours)
Tide/current (58 hours)
Darkness (39 hours)

Jellyfish drift risk

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

Low · 32/100

Low peak drift risk around Tue 23:00.

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 15:00

Tue 15:00, Wed 04:00

Nearby alternatives in Japan

Okinawa - Blue Cave

56 km away

✅ Good

Miyako

257 km away

✅ Good

Ishigaki

381 km away

✅ Good

Advanced forecast data

Viewing historical data

Wed 09:00 – Sat 09:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.35 around Thu 11:00; 1 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 0.98m to 1.16m).

Wind is at or below 5.4m/s in 4/24 sampled hours (range 4.14 to 7.6m/s).

Tides range from -0.17m to 2.04m; 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 fair ⚠️ Fair

Thu 03:00 poor ❌ Limited

Thu 04:00 poor ❌ Limited

Thu 05:00 poor ❌ Limited

Thu 06:00 poor ❌ Limited

Thu 07:00 poor ❌ Limited

Thu 08:00 poor ❌ Limited

Thu 09:00 poor ❌ Limited

Thu 10:00 poor ❌ Limited

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 poor ❌ Limited

Fri 05:00 poor ❌ Limited

Fri 06:00 poor ❌ Limited

Fri 07:00 poor ❌ Limited

Fri 08:00 poor ❌ Limited

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 poor ❌ Limited

Sat 01:00 fair ⚠️ Fair

Sat 02:00 poor ❌ Limited

Sat 03:00 fair ⚠️ Fair

Sat 04:00 poor ❌ Limited

Sat 05:00 poor ❌ Limited

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	1.16 · high	6.18 · high	27.10 · good	poor
Wed 10:00	1.16 · high	6.10 · high	27.10 · good	poor
Wed 11:00	1.14 · high	6.14 · high	27.00 · good	poor
Wed 12:00	1.14 · high	6.38 · high	27.00 · good	poor
Wed 13:00	1.14 · high	6.65 · high	27.00 · good	poor
Wed 14:00	1.12 · high	7.15 · high	27.00 · good	poor
Wed 15:00	1.12 · high	7.32 · high	27.00 · good	poor
Wed 16:00	1.12 · high	7.28 · high	27.00 · good	poor
Wed 17:00	1.10 · high	6.94 · high	26.90 · good	poor
Wed 18:00	1.10 · high	6.80 · high	26.90 · good	poor
Wed 19:00	1.10 · high	7.32 · high	26.90 · good	poor
Wed 20:00	1.10 · high	7.60 · high	26.90 · good	poor
Wed 21:00	1.10 · high	7.33 · high	26.90 · good	poor
Wed 22:00	1.08 · high	7.01 · high	26.90 · good	poor
Wed 23:00	1.08 · high	6.92 · high	26.90 · good	poor
Thu 00:00	1.06 · high	6.60 · high	26.90 · good	poor
Thu 01:00	1.04 · high	6.20 · high	27.00 · good	poor
Thu 02:00	1.02 · high	5.11 · good	27.10 · good	fair
Thu 03:00	1.00 · high	4.41 · good	27.20 · good	poor
Thu 04:00	1.00 · high	4.14 · good	27.30 · good	poor
Thu 05:00	0.98 · high	4.78 · good	27.40 · good	poor
Thu 06:00	0.98 · high	5.87 · high	27.50 · good	poor
Thu 07:00	1.00 · high	6.49 · high	27.50 · good	poor
Thu 08:00	1.00 · high	6.64 · high	27.50 · good	poor
Thu 09:00	1.02 · high	7.04 · high	27.40 · good	poor
Thu 10:00	1.06 · high	7.07 · high	27.40 · good	poor
Thu 11:00	1.08 · high	6.49 · high	27.30 · good	poor
Thu 12:00	1.12 · high	6.09 · high	27.30 · good	poor
Thu 13:00	1.14 · high	6.05 · high	27.20 · good	poor
Thu 14:00	1.14 · high	6.25 · high	27.20 · good	poor
Thu 15:00	1.16 · high	6.76 · high	27.20 · good	poor
Thu 16:00	1.16 · high	7.11 · high	27.20 · good	poor
Thu 17:00	1.16 · high	7.11 · high	27.10 · good	poor
Thu 18:00	1.16 · high	7.60 · high	27.10 · good	poor
Thu 19:00	1.16 · high	7.44 · high	27.10 · good	poor
Thu 20:00	1.14 · high	6.98 · high	27.10 · good	poor
Thu 21:00	1.14 · high	7.22 · high	27.10 · good	poor
Thu 22:00	1.14 · high	7.46 · high	27.10 · good	poor
Thu 23:00	1.12 · high	6.84 · high	27.10 · good	poor
Fri 00:00	1.12 · high	6.85 · high	27.10 · good	poor
Fri 01:00	1.12 · high	5.81 · high	27.20 · good	poor
Fri 02:00	1.12 · high	6.12 · high	27.20 · good	poor
Fri 03:00	1.12 · high	7.00 · high	27.30 · good	poor
Fri 04:00	1.12 · high	7.08 · high	27.40 · good	poor
Fri 05:00	1.12 · high	6.95 · high	27.50 · good	poor
Fri 06:00	1.12 · high	6.91 · high	27.50 · good	poor
Fri 07:00	1.12 · high	6.92 · high	27.50 · good	poor
Fri 08:00	1.14 · high	6.91 · high	27.50 · good	poor
Fri 09:00	1.14 · high	6.89 · high	27.50 · good	poor
Fri 10:00	1.12 · high	6.14 · high	27.50 · good	poor
Fri 11:00	1.12 · high	5.63 · high	27.50 · good	poor
Fri 12:00	1.10 · high	5.24 · good	27.50 · good	poor
Fri 13:00	1.10 · high	5.13 · good	27.50 · good	poor
Fri 14:00	1.10 · high	5.21 · good	27.40 · good	poor
Fri 15:00	1.10 · high	5.84 · high	27.40 · good	poor
Fri 16:00	1.12 · high	6.83 · high	27.40 · good	poor
Fri 17:00	1.12 · high	6.65 · high	27.30 · good	poor
Fri 18:00	1.14 · high	5.90 · high	27.30 · good	poor
Fri 19:00	1.14 · high	6.20 · high	27.30 · good	poor
Fri 20:00	1.14 · high	5.94 · high	27.30 · good	poor
Fri 21:00	1.14 · high	6.05 · high	27.30 · good	poor
Fri 22:00	1.14 · high	5.89 · high	27.30 · good	poor
Fri 23:00	1.14 · high	5.27 · good	27.30 · good	poor
Sat 00:00	1.14 · high	5.42 · high	27.30 · good	poor
Sat 01:00	1.14 · high	5.15 · good	27.40 · good	fair
Sat 02:00	1.16 · high	5.99 · high	27.40 · good	poor
Sat 03:00	1.16 · high	5.31 · good	27.50 · good	fair
Sat 04:00	1.16 · high	5.33 · good	27.50 · good	poor
Sat 05:00	1.16 · high	5.80 · high	27.60 · good	poor
Sat 06:00	0.98 · high	6.47 · high	28.20 · good	fair
Sat 07:00	0.98 · high	6.01 · high	28.20 · good	fair
Sat 08:00	0.96 · high	5.76 · high	28.20 · good	fair