SnorkelForecast.com

Kerama Islands Snorkel Report Today

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

The skinny

Go in the best window Report Wed 00:24

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

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

Best afternoon signal: Wed 14:00 (Good). Peak afternoon wind is about 2.2 m/s.

Email me when it is good

Sunrise

05:50

Sunset

19:23

Water

28.6°C

Max air

28.1°C

Sky

Clear

15% cloud

Good window is available today

Next safe window: Wed 00:00–01:00 (33% of next 72h are suitable)

3-day planner Best available Show data

3-day planner

Wednesday

✅ good conditions

Main blocker: Waves

Thursday

✅ good conditions

Main blocker: Waves

Friday

⚠️ fair 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 (60 hours)
  • Tide/current (53 hours)
  • Darkness (34 hours)

Jellyfish drift risk

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

Low · 32/100

Low peak drift risk around Wed 07:00.

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

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

Tue 15:00 – Fri 15:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.37 around Wed 16:00; 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 1.12m to 1.18m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 5.75 to 7.61m/s).

Tides range from -0.22m to 1.99m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
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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
Tue 15:00 1.18 · high 7.45 · high 26.80 · good poor
Tue 16:00 1.18 · high 6.85 · high 26.80 · good poor
Tue 17:00 1.18 · high 6.89 · high 26.70 · good poor
Tue 18:00 1.18 · high 7.21 · high 26.70 · good poor
Tue 19:00 1.18 · high 6.70 · high 26.70 · good poor
Tue 20:00 1.18 · high 7.27 · high 26.70 · good poor
Tue 21:00 1.18 · high 7.61 · high 26.70 · good poor
Tue 22:00 1.18 · high 7.50 · high 26.70 · good poor
Tue 23:00 1.18 · high 7.28 · high 26.70 · good poor
Wed 00:00 1.18 · high 6.51 · high 26.70 · good poor
Wed 01:00 1.18 · high 6.26 · high 26.70 · good poor
Wed 02:00 1.16 · high 6.94 · high 26.70 · good poor
Wed 03:00 1.16 · high 5.90 · high 26.80 · good poor
Wed 04:00 1.16 · high 6.16 · high 26.90 · good poor
Wed 05:00 1.16 · high 6.13 · high 26.90 · good poor
Wed 06:00 1.16 · high 5.75 · high 26.90 · good poor
Wed 07:00 1.18 · high 5.84 · high 27.10 · good fair
Wed 08:00 1.16 · high 6.12 · high 27.10 · good poor
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