MARINE REPORT / 72 HOURS

Kerama Islands Snorkel Report Today

Japan · Updated Sun 14:16 (JST) · Source: Snapshot

The skinny

Marginal Data updated Sun 14:16 (JST)

Kerama Islands looks marginal today. The least-bad daylight window is around Sun 18:00, but waves is limiting the forecast.

Right now (forecast)

Poor · 3.4/10

Sun 16:00 (JST)

Later today

Fair · 4.0/10

Sun 18:00 (JST)

Next three days

Fair · 4.5/10

Mon 17:00 (JST)

Model estimates using Open-Meteo; not observations or safety guarantees. Check official advisories and conditions at the beach.

Score: 4.0/10

Best time: Sun 18:00

Main risk: Waves

No useful morning window is showing yet.

Best afternoon signal: Sun 18:00 (Fair). Peak afternoon wind is about 6.3 m/s.

Email me when it is good

Sunrise

06:31

Sunset

18:00

Water

28.1°C

Max air

26.9°C

Sky

Cloudy

98% cloud

No good model 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

Sunday

⚠️ Fair conditions

Main blocker: Waves

Monday

⚠️ Fair conditions

Main blocker: Waves

Tuesday

❌ Poor conditions

Main blocker: Waves

Best available hours

  • Mon 17:00: Fair (0.45) · still limited by waves, wind
  • Mon 16:00: Fair (0.41) · still limited by waves, tide/current
  • Mon 12:00: Fair (0.41) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

  • Waves (69 hours)
  • Tide/current (59 hours)
  • Wind (47 hours)

Jellyfish drift risk

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

Low · 34/100

Low peak drift risk around Mon 04:00.

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: Wed 02:00

Sun 22:00, Tue 15:00, Wed 02:00

Nearby alternatives in Japan

Okinawa - Blue Cave

56 km away

✅ Good

Miyako

257 km away

⚠️ Fair

Ishigaki

381 km away

⚠️ Fair

Advanced forecast data

Viewing historical data

Mon 16:00 – Thu 16:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.38 around Mon 18:00; 2 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 1.2m to 2.06m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 6.45 to 12.53m/s).

Tides range from 0.31m to 1.48m; 1 of 24 hours are in or near peak slack windows.

72-hour historical overview
Poor ❌ Limited
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Fair ⚠️ Fair
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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 is better in daylight, so night hours score lower.
Detailed hourly data table
Time Wave (m) Wind (m/s) Sea temp (°C) Status
Mon 16:00 1.20 · high 6.45 · high 28.90 · good Poor
Mon 17:00 1.28 · high 6.65 · high 28.90 · good Poor
Mon 18:00 1.38 · high 6.74 · high 28.90 · good Fair
Mon 19:00 1.52 · high 9.57 · high 28.80 · good Poor
Mon 20:00 1.30 · high 10.36 · high 28.80 · good Poor
Mon 21:00 1.46 · high 11.03 · high 28.80 · good Poor
Mon 22:00 1.54 · high 11.00 · high 28.80 · good Poor
Mon 23:00 1.62 · high 10.35 · high 28.80 · good Poor
Tue 00:00 1.70 · high 10.41 · high 28.80 · good Poor
Tue 01:00 1.72 · high 10.36 · high 28.80 · good Poor
Tue 02:00 1.76 · high 10.36 · high 28.70 · good Poor
Tue 03:00 1.82 · high 11.10 · high 28.70 · good Poor
Tue 04:00 1.84 · high 11.57 · high 28.70 · good Poor
Tue 05:00 1.84 · high 11.18 · high 28.70 · good Poor
Tue 06:00 1.86 · high 11.22 · high 28.60 · good Poor
Tue 07:00 1.92 · high 12.01 · high 28.60 · good Poor
Tue 08:00 1.96 · high 12.16 · high 28.60 · good Poor
Tue 09:00 2.02 · high 12.53 · high 28.60 · good Poor
Tue 10:00 2.04 · high 11.96 · high 28.60 · good Poor
Tue 11:00 2.04 · high 11.52 · high 28.60 · good Poor
Tue 12:00 2.06 · high 10.42 · high 28.60 · good Poor
Tue 13:00 2.04 · high 10.68 · high 28.60 · good Poor
Tue 14:00 2.02 · high 10.66 · high 28.60 · good Fair
Tue 15:00 2.00 · high 11.74 · high 28.60 · good Poor
Tue 16:00 2.02 · high 11.64 · high 28.60 · good Poor
Tue 17:00 2.02 · high 11.25 · high 28.50 · good Poor
Tue 18:00 2.04 · high 10.51 · high 28.50 · good Poor
Tue 19:00 2.02 · high 10.22 · high 28.50 · good Poor
Tue 20:00 1.92 · high 10.72 · high 28.50 · good Poor
Tue 21:00 1.90 · high 10.78 · high 28.50 · good Poor
Tue 22:00 1.86 · high 10.51 · high 28.50 · good Poor
Tue 23:00 1.80 · high 9.60 · high 28.50 · good Poor
Wed 00:00 1.76 · high 10.23 · high 28.50 · good Poor
Wed 01:00 1.74 · high 9.28 · high 28.50 · good Poor
Wed 02:00 1.74 · high 8.91 · high 28.40 · good Poor
Wed 03:00 1.70 · high 8.77 · high 28.40 · good Poor
Wed 04:00 1.68 · high 8.63 · high 28.40 · good Poor
Wed 05:00 1.66 · high 8.68 · high 28.40 · good Poor
Wed 06:00 1.64 · high 8.96 · high 28.40 · good Poor
Wed 07:00 1.64 · high 8.79 · high 28.40 · good Poor
Wed 08:00 1.66 · high 8.98 · high 28.40 · good Poor
Wed 09:00 1.66 · high 9.06 · high 28.40 · good Poor
Wed 10:00 1.66 · high 9.45 · high 28.40 · good Poor
Wed 11:00 1.66 · high 9.84 · high 28.40 · good Poor
Wed 12:00 1.66 · high 9.53 · high 28.40 · good Poor
Wed 13:00 1.66 · high 9.73 · high 28.40 · good Poor
Wed 14:00 1.64 · high 9.98 · high 28.40 · good Poor
Wed 15:00 1.64 · high 9.63 · high 28.40 · good Poor
Wed 16:00 1.64 · high 10.12 · high 28.40 · good Poor
Wed 17:00 1.64 · high 9.91 · high 28.40 · good Poor
Wed 18:00 1.64 · high 9.54 · high 28.40 · good Poor
Wed 19:00 1.64 · high 11.09 · high 28.30 · good Poor
Wed 20:00 1.60 · high 10.61 · high 28.30 · good Poor
Wed 21:00 1.62 · high 10.46 · high 28.30 · good Poor
Wed 22:00 1.60 · high 10.34 · high 28.30 · good Poor
Wed 23:00 1.60 · high 9.55 · high 28.30 · good Poor
Thu 00:00 1.58 · high 9.71 · high 28.30 · good Poor
Thu 01:00 1.44 · high 9.19 · high 28.30 · good Poor
Thu 02:00 1.42 · high 9.37 · high 28.30 · good Poor
Thu 03:00 1.40 · high 8.64 · high 28.30 · good Poor
Thu 04:00 1.38 · high 8.04 · high 28.30 · good Poor
Thu 05:00 1.36 · high 8.68 · high 28.30 · good Poor
Thu 06:00 1.34 · high 9.19 · high 28.20 · good Poor
Thu 07:00 1.34 · high 9.02 · high 28.20 · good Poor
Thu 08:00 1.36 · high 8.98 · high 28.20 · good Poor
Thu 09:00 1.36 · high 9.05 · high 28.20 · good Poor
Thu 10:00 1.32 · high 8.63 · high 28.20 · good Poor
Thu 11:00 1.28 · high 8.20 · high 28.20 · good Poor
Thu 12:00 1.24 · high 8.24 · high 28.30 · good Poor
Thu 13:00 1.20 · high 8.27 · high 28.30 · good Poor
Thu 14:00 1.14 · high 8.96 · high 28.30 · good Poor
Thu 15:00 1.10 · high 8.00 · high 28.30 · good Poor