MARINE REPORT / 72 HOURS

Kerama Islands Snorkel Report Today

Japan · Updated Sun 23:41 (JST) · Source: Snapshot

The skinny

Marginal Data updated Sun 23:41 (JST)

Kerama Islands looks marginal today. The least-bad daylight window is around Mon 12:00, but waves is limiting the forecast.

Right now (forecast)

Poor · 0.0/10

Mon 01:00 (JST)

Later today

Fair · 4.3/10

Mon 12:00 (JST)

Next three days

Fair · 4.3/10

Mon 12:00 (JST)

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

Score: 4.3/10

Best time: Mon 12:00

Main risk: Waves

Best morning signal: Mon 10:00 (Fair).

Best afternoon signal: Mon 12:00 (Fair). Peak afternoon wind is about 6.0 m/s.

Email me when it is good

Sunrise

06:31

Sunset

18:00

Water

27.9°C

Max air

27.2°C

Sky

Clear

27% 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

Monday

⚠️ Fair conditions

Main blocker: Waves

Tuesday

⚠️ Fair conditions

Main blocker: Waves

Wednesday

❌ Poor conditions

Main blocker: Waves

Best available hours

  • Mon 12:00: Fair (0.43) · still limited by waves, tide/current
  • Mon 17:00: Fair (0.42) · still limited by waves, wind
  • Mon 10:00: Fair (0.42) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

  • Waves (69 hours)
  • Tide/current (60 hours)
  • Wind (53 hours)

Jellyfish drift risk

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

Low · 34/100

Low peak drift risk around Mon 03:00.

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

Tue 15:00, Wed 16:00

Nearby alternatives in Japan

Okinawa - Blue Cave

56 km away

✅ Good

Miyako

257 km away

❌ Poor

Ishigaki

381 km away

❌ Poor

Advanced forecast data

Viewing historical data

Sun 01:00 – Wed 01:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.38 around Sun 14:00; 3 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 1.0m to 1.8m).

Wind is at or below 5.4m/s in 11/24 sampled hours (range 3.65 to 8.49m/s).

Tides range from 0.15m to 1.92m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
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Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
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Poor ❌ Limited
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Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
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
Sun 01:00 1.02 · high 3.65 · good 29.20 · good Poor
Sun 02:00 1.00 · high 4.43 · good 29.10 · good Poor
Sun 03:00 1.00 · high 5.62 · high 29.10 · good Poor
Sun 04:00 1.00 · high 4.02 · good 29.10 · good Poor
Sun 05:00 1.02 · high 4.10 · good 29.10 · good Poor
Sun 06:00 1.02 · high 4.66 · good 29.10 · good Poor
Sun 07:00 1.02 · high 5.28 · good 29.10 · good Poor
Sun 08:00 1.04 · high 5.31 · good 29.10 · good Poor
Sun 09:00 1.04 · high 5.47 · high 29.10 · good Poor
Sun 10:00 1.04 · high 5.63 · high 29.10 · good Poor
Sun 11:00 1.06 · high 5.13 · good 29.20 · good Fair
Sun 12:00 1.06 · high 5.34 · good 29.30 · good Fair
Sun 13:00 1.08 · high 6.06 · high 29.40 · good Poor
Sun 14:00 1.08 · high 4.53 · good 29.40 · good Fair
Sun 15:00 1.10 · high 5.93 · high 29.50 · good Poor
Sun 16:00 1.12 · high 5.37 · good 29.50 · good Poor
Sun 17:00 1.14 · high 7.22 · high 29.50 · good Poor
Sun 18:00 1.16 · high 6.36 · high 29.40 · good Poor
Sun 19:00 1.20 · high 7.17 · high 29.40 · good Poor
Sun 20:00 1.76 · high 8.49 · high 29.30 · good Poor
Sun 21:00 1.80 · high 6.85 · high 29.20 · good Poor
Sun 22:00 1.22 · high 7.43 · high 29.20 · good Poor
Sun 23:00 1.20 · high 6.28 · high 29.20 · good Poor
Mon 00:00 1.16 · high 6.01 · high 29.10 · good Poor
Mon 01:00 1.12 · high 6.35 · high 29.10 · good Poor
Mon 02:00 1.08 · high 6.26 · high 29.10 · good Poor
Mon 03:00 1.04 · high 6.96 · high 29.10 · good Poor
Mon 04:00 1.02 · high 6.93 · high 29.10 · good Poor
Mon 05:00 1.00 · high 6.69 · high 29.00 · good Poor
Mon 06:00 0.98 · high 7.59 · high 29.00 · good Poor
Mon 07:00 0.96 · high 7.96 · high 29.00 · good Poor
Mon 08:00 0.94 · high 7.77 · high 29.00 · good Poor
Mon 09:00 0.92 · high 7.92 · high 29.00 · good Poor
Mon 10:00 0.92 · high 7.89 · high 29.00 · good Poor
Mon 11:00 0.90 · high 7.60 · high 29.00 · good Fair
Mon 12:00 0.90 · high 7.35 · high 29.10 · good Fair
Mon 13:00 0.92 · high 8.46 · high 29.10 · good Fair
Mon 14:00 0.92 · high 8.52 · high 29.10 · good Fair
Mon 15:00 0.94 · high 9.91 · high 29.10 · good Poor
Mon 16:00 0.92 · high 8.52 · high 29.10 · good Poor
Mon 17:00 0.92 · high 7.10 · high 29.10 · good Poor
Mon 18:00 0.90 · high 6.37 · high 29.10 · good Fair
Mon 19:00 0.88 · high 6.02 · high 29.10 · good Poor
Mon 20:00 0.88 · high 5.76 · high 29.10 · good Poor
Mon 21:00 0.82 · high 5.23 · good 29.10 · good Poor
Mon 22:00 0.78 · high 5.88 · high 29.10 · good Poor
Mon 23:00 0.76 · high 6.71 · high 29.00 · good Poor
Tue 00:00 0.78 · high 6.19 · high 29.00 · good Poor
Tue 01:00 0.78 · high 6.28 · high 29.00 · good Poor
Tue 02:00 0.76 · high 5.88 · high 29.00 · good Poor
Tue 03:00 0.76 · high 6.53 · high 29.00 · good Poor
Tue 04:00 0.76 · high 6.36 · high 29.00 · good Poor
Tue 05:00 0.76 · high 6.52 · high 29.00 · good Poor
Tue 06:00 0.76 · high 6.55 · high 29.00 · good Poor
Tue 07:00 0.74 · high 6.15 · high 29.00 · good Poor
Tue 08:00 0.74 · high 5.58 · high 29.00 · good Poor
Tue 09:00 0.72 · high 5.39 · good 29.00 · good Fair
Tue 10:00 0.70 · high 5.63 · high 29.00 · good Fair
Tue 11:00 0.70 · high 5.67 · high 29.00 · good Fair
Tue 12:00 0.68 · high 5.83 · high 29.10 · good Poor
Tue 13:00 0.72 · high 5.77 · high 29.10 · good Poor
Tue 14:00 0.74 · high 5.93 · high 29.20 · good Poor
Tue 15:00 0.78 · high 6.22 · high 29.20 · good Poor
Tue 16:00 0.78 · high 6.86 · high 29.20 · good Poor
Tue 17:00 0.76 · high 6.94 · high 29.10 · good Poor
Tue 18:00 0.76 · high 6.54 · high 29.10 · good Poor
Tue 19:00 0.72 · high 5.88 · high 29.10 · good Poor
Tue 20:00 0.70 · high 4.90 · good 29.00 · good Poor
Tue 21:00 0.72 · high 4.26 · good 28.90 · good Poor
Tue 22:00 0.70 · high 4.03 · good 28.90 · good Poor
Tue 23:00 0.58 · high 5.45 · high 28.90 · good Poor
Wed 00:00 0.56 · high 5.52 · high 28.80 · good Poor