Can you snorkel in Kerama Islands today?

Yes. The next good snorkeling window in Kerama Islands starts Thu 00:00 and lasts until 10:00. Around 27% 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 · Showing fallback/stale data

The skinny

Go in the best window Report Wed 19:48

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

Score: 7.0/10

Best time: Thu 09:00

Main risk: Waves

No useful morning window is showing yet.

No useful afternoon window is showing yet.

Email me when it is good

Sunrise

05:51

Sunset

19:23

Water

29.1°C

Max air

28.1°C

Sky

Clear

18% cloud

Good window is available today

Next safe window: Thu 00:00–10:00 (27% of next 72h are suitable)

3-day planner Best available Show data

3-day planner

Wednesday

❌ poor conditions

Main blocker: Waves

Thursday

✅ good conditions

Main blocker: Waves

Friday

⚠️ fair conditions

Main blocker: Waves

Best available hours

Next safe window starts at Thu 00:00 until 10:00.

Why this verdict

Main blockers across the next 72 hours:

Waves (41 hours)
Tide/current (36 hours)
Darkness (26 hours)

Jellyfish drift risk

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

Low · 32/100

Low peak drift risk around Thu 00:00.

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.

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

Sun 10:00 – Wed 10:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.35 around Sun 19:00; 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 0.62m to 0.66m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 11.6 to 18.9m/s).

Tides range from 0.31m to 1.55m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview

Sun 10:00 poor ❌ Limited

Sun 11:00 poor ❌ Limited

Sun 12:00 poor ❌ Limited

Sun 13:00 poor ❌ Limited

Sun 14:00 poor ❌ Limited

Sun 15:00 poor ❌ Limited

Sun 16:00 poor ❌ Limited

Sun 17:00 poor ❌ Limited

Sun 18:00 poor ❌ Limited

Sun 19:00 poor ❌ Limited

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 fair ⚠️ Fair

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 fair ⚠️ Fair

Tue 01:00 fair ⚠️ Fair

Tue 02:00 fair ⚠️ Fair

Tue 03:00 fair ⚠️ Fair

Tue 04:00 fair ⚠️ Fair

Tue 05:00 fair ⚠️ Fair

Tue 06:00 fair ⚠️ Fair

Tue 07:00 fair ⚠️ Fair

Tue 08:00 fair ⚠️ Fair

Tue 09:00 fair ⚠️ Fair

Tue 10:00 fair ⚠️ Fair

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 fair ⚠️ Fair

Wed 01:00 fair ⚠️ Fair

Wed 02:00 fair ⚠️ Fair

Wed 03:00 fair ⚠️ Fair

Wed 04:00 fair ⚠️ Fair

Wed 05:00 fair ⚠️ Fair

Wed 06:00 fair ⚠️ Fair

Wed 07:00 fair ⚠️ Fair

Wed 08:00 fair ⚠️ Fair

Wed 09:00 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
Sun 10:00	0.66 · high	11.60 · high	28.30 · good	poor
Sun 11:00	0.64 · high	12.20 · high	28.30 · good	poor
Sun 12:00	0.64 · high	13.80 · high	28.20 · good	poor
Sun 13:00	0.64 · high	14.60 · high	28.20 · good	poor
Sun 14:00	0.62 · high	15.70 · high	28.20 · good	poor
Sun 15:00	0.62 · high	16.70 · high	28.10 · good	poor
Sun 16:00	0.62 · high	16.90 · high	28.10 · good	poor
Sun 17:00	0.64 · high	17.70 · high	28.10 · good	poor
Sun 18:00	0.64 · high	18.90 · high	28.10 · good	poor
Sun 19:00	0.64 · high	18.10 · high	28.00 · good	poor
Sun 20:00	0.64 · high	17.00 · high	28.00 · good	poor
Sun 21:00	0.64 · high	16.70 · high	28.00 · good	poor
Sun 22:00	0.64 · high	16.40 · high	28.00 · good	poor
Sun 23:00	0.62 · high	16.70 · high	28.00 · good	poor
Mon 00:00	0.62 · high	16.80 · high	28.00 · good	poor
Mon 01:00	0.62 · high	17.10 · high	28.00 · good	poor
Mon 02:00	0.64 · high	16.90 · high	28.20 · good	poor
Mon 03:00	0.64 · high	17.90 · high	28.30 · good	poor
Mon 04:00	0.64 · high	17.30 · high	28.40 · good	poor
Mon 05:00	0.66 · high	16.90 · high	28.50 · good	poor
Mon 06:00	0.66 · high	16.20 · high	28.60 · good	poor
Mon 07:00	0.66 · high	15.30 · high	28.60 · good	poor
Mon 08:00	0.66 · high	14.50 · high	28.60 · good	poor
Mon 09:00	0.66 · high	12.90 · high	28.50 · good	poor
Mon 10:00	0.74 · high	1.87 · good	28.50 · good	fair
Mon 11:00	0.74 · high	1.27 · good	28.50 · good	poor
Mon 12:00	0.76 · high	0.92 · good	28.50 · good	poor
Mon 13:00	0.76 · high	0.89 · good	28.50 · good	poor
Mon 14:00	0.78 · high	1.31 · good	28.40 · good	poor
Mon 15:00	0.78 · high	1.73 · good	28.40 · good	poor
Mon 16:00	0.78 · high	1.87 · good	28.40 · good	poor
Mon 17:00	0.78 · high	1.88 · good	28.40 · good	poor
Mon 18:00	0.78 · high	1.55 · good	28.40 · good	poor
Mon 19:00	0.78 · high	1.12 · good	28.40 · good	poor
Mon 20:00	0.78 · high	0.87 · good	28.30 · good	poor
Mon 21:00	0.78 · high	1.36 · good	28.30 · good	poor
Mon 22:00	0.78 · high	1.50 · good	28.30 · good	poor
Mon 23:00	0.78 · high	1.95 · good	28.30 · good	poor
Tue 00:00	0.78 · high	2.04 · good	28.40 · good	fair
Tue 01:00	0.78 · high	1.19 · good	28.50 · good	fair
Tue 02:00	0.78 · high	0.55 · good	28.60 · good	fair
Tue 03:00	0.78 · high	0.74 · good	28.80 · good	fair
Tue 04:00	0.78 · high	0.94 · good	28.90 · good	fair
Tue 05:00	0.80 · high	1.36 · good	29.10 · good	fair
Tue 06:00	0.80 · high	1.86 · good	29.10 · good	fair
Tue 07:00	0.80 · high	1.62 · good	29.10 · good	fair
Tue 08:00	0.80 · high	2.07 · good	29.10 · good	fair
Tue 09:00	0.80 · high	2.63 · good	29.00 · good	fair
Tue 10:00	0.82 · high	3.80 · good	28.90 · good	fair
Tue 11:00	0.82 · high	4.87 · good	28.80 · good	poor
Tue 12:00	0.84 · high	4.39 · good	28.70 · good	poor
Tue 13:00	0.88 · high	3.81 · good	28.70 · good	poor
Tue 14:00	0.90 · high	3.63 · good	28.60 · good	poor
Tue 15:00	0.94 · high	4.26 · good	28.60 · good	poor
Tue 16:00	0.98 · high	4.63 · good	28.50 · good	poor
Tue 17:00	1.02 · high	4.51 · good	28.50 · good	poor
Tue 18:00	1.06 · high	4.65 · good	28.40 · good	poor
Tue 19:00	1.12 · high	4.77 · good	28.40 · good	poor
Tue 20:00	1.18 · high	4.74 · good	28.40 · good	poor
Tue 21:00	1.24 · high	4.55 · good	28.40 · good	poor
Tue 22:00	1.32 · high	4.91 · good	28.40 · good	poor
Tue 23:00	1.38 · high	4.81 · good	28.40 · good	poor
Wed 00:00	1.46 · high	4.81 · good	28.40 · good	fair
Wed 01:00	1.56 · high	5.09 · good	28.40 · good	fair
Wed 02:00	1.66 · high	5.71 · high	28.50 · good	fair
Wed 03:00	1.76 · high	6.21 · high	28.60 · good	fair
Wed 04:00	1.84 · high	6.60 · high	28.60 · good	fair
Wed 05:00	1.94 · high	6.91 · high	28.70 · good	fair
Wed 06:00	2.02 · high	7.84 · high	28.70 · good	fair
Wed 07:00	2.10 · high	8.54 · high	28.70 · good	fair
Wed 08:00	2.20 · high	8.47 · high	28.70 · good	fair
Wed 09:00	2.28 · high	7.96 · high	28.70 · good	fair