MARINE REPORT / 72 HOURS

Kerama Islands Snorkel Report Today

Japan · Updated Sun 01:48 (JST) · Source: Snapshot

The skinny

Marginal Data updated Sun 01:48 (JST)

Kerama Islands looks marginal today. The least-bad daylight window is around Sun 16:00, but waves is limiting the forecast.

Right now (forecast)

Poor · 0.0/10

Sun 03:00 (JST)

Later today

Fair · 4.3/10

Sun 16:00 (JST)

Next three days

Fair · 4.7/10

Mon 17:00 (JST)

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

Score: 4.3/10

Best time: Sun 16:00

Main risk: Waves

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

Best afternoon signal: Sun 16:00 (Fair). Peak afternoon wind is about 6.8 m/s.

Email me when it is good

Sunrise

06:30

Sunset

18:01

Water

27.9°C

Max air

27.3°C

Sky

Partly cloudy

38% 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

⚠️ Fair conditions

Main blocker: Waves

Best available hours

  • Mon 17:00: Fair (0.47) · still limited by waves, tide/current
  • Sun 16:00: Fair (0.43) · still limited by waves, wind
  • Sun 18:00: Fair (0.43) · still limited by waves, wind

Why this verdict

Main blockers across the next 72 hours:

  • Waves (69 hours)
  • Tide/current (62 hours)
  • Wind (42 hours)

Jellyfish drift risk

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

Low · 34/100

Low peak drift risk around Sun 09:00.

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

Sun 12:00, Sun 22:00, Tue 15:00

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 current forecast

Sun 03:00 – Wed 03:00 (JST)

Previous day Yesterday

Snorkel Score (next 24h)

Best snorkel score is 0.43 around Sun 16:00; 7 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 0.96m to 1.12m).

Wind is at or below 5.4m/s in 6/24 sampled hours (range 4.35 to 7.3m/s).

Tides range from 0.47m to 1.34m; 2 of 24 hours are in or near peak slack windows.

72-hour forecast overview
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
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
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
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
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
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 04:00 1.12 · high 7.30 · high 27.90 · good Poor
Sun 05:00 1.06 · high 5.44 · high 27.90 · good Poor
Sun 06:00 1.02 · high 4.35 · good 27.90 · good Poor
Sun 07:00 1.00 · high 5.17 · good 27.90 · good Poor
Sun 08:00 0.98 · high 5.94 · high 28.00 · good Poor
Sun 09:00 0.96 · high 6.41 · high 28.00 · good Poor
Sun 10:00 0.96 · high 5.75 · high 28.00 · good Fair
Sun 11:00 0.98 · high 5.41 · high 28.00 · good Fair
Sun 12:00 0.98 · high 4.89 · good 28.10 · good Fair
Sun 13:00 0.98 · high 4.79 · good 28.10 · good Poor
Sun 14:00 0.96 · high 4.69 · good 28.10 · good Poor
Sun 15:00 0.96 · high 4.85 · good 28.10 · good Fair
Sun 16:00 0.96 · high 5.44 · high 28.10 · good Fair
Sun 17:00 0.98 · high 6.35 · high 28.10 · good Fair
Sun 18:00 0.98 · high 6.83 · high 28.10 · good Fair
Sun 19:00 0.98 · high 7.14 · high 28.10 · good Poor
Sun 20:00 0.98 · high 7.29 · high 28.00 · good Poor
Sun 21:00 0.98 · high 6.93 · high 28.00 · good Poor
Sun 22:00 0.98 · high 6.92 · high 28.00 · good Poor
Sun 23:00 0.98 · high 6.96 · high 28.00 · good Poor
Mon 00:00 0.98 · high 6.63 · high 28.00 · good Poor
Mon 01:00 0.98 · high 6.25 · high 28.00 · good Poor
Mon 02:00 0.96 · high 6.20 · high 27.90 · good Poor
Mon 03:00 0.96 · high 6.42 · high 27.90 · good Poor
Mon 04:00 0.94 · high 6.52 · high 27.90 · good Poor
Mon 05:00 0.92 · high 6.97 · high 27.90 · good Poor
Mon 06:00 0.90 · high 6.94 · high 27.90 · good Poor
Mon 07:00 0.88 · high 6.75 · high 27.90 · good Poor
Mon 08:00 0.86 · high 6.27 · high 27.90 · good Poor
Mon 09:00 0.84 · high 5.87 · high 27.90 · good Fair
Mon 10:00 0.84 · high 5.53 · high 28.00 · good Fair
Mon 11:00 0.82 · high 5.17 · good 28.00 · good Fair
Mon 12:00 0.82 · high 5.13 · good 28.10 · good Fair
Mon 13:00 0.84 · high 4.78 · good 28.20 · good Fair
Mon 14:00 0.84 · high 4.72 · good 28.20 · good Fair
Mon 15:00 0.86 · high 5.30 · good 28.20 · good Fair
Mon 16:00 0.88 · high 5.33 · good 28.20 · good Fair
Mon 17:00 0.92 · high 4.98 · good 28.20 · good Fair
Mon 18:00 0.94 · high 5.32 · good 28.20 · good Poor
Mon 19:00 0.96 · high 5.74 · high 28.10 · good Poor
Mon 20:00 1.00 · high 5.98 · high 28.10 · good Poor
Mon 21:00 1.02 · high 5.99 · high 28.00 · good Poor
Mon 22:00 1.02 · high 6.02 · high 28.00 · good Poor
Mon 23:00 1.02 · high 5.99 · high 28.00 · good Poor
Tue 00:00 1.02 · high 5.51 · high 28.00 · good Poor
Tue 01:00 1.02 · high 4.45 · good 27.90 · good Poor
Tue 02:00 1.04 · high 4.66 · good 27.90 · good Poor
Tue 03:00 1.04 · high 4.79 · good 27.90 · good Poor
Tue 04:00 1.06 · high 5.37 · good 27.90 · good Poor
Tue 05:00 1.10 · high 6.34 · high 27.90 · good Poor
Tue 06:00 1.12 · high 6.73 · high 27.90 · good Poor
Tue 07:00 1.16 · high 6.11 · high 27.90 · good Poor
Tue 08:00 1.20 · high 5.42 · high 27.90 · good Poor
Tue 09:00 1.24 · high 5.20 · good 27.90 · good Fair
Tue 10:00 1.26 · high 4.88 · good 28.00 · good Fair
Tue 11:00 1.30 · high 4.43 · good 28.00 · good Fair
Tue 12:00 1.32 · high 3.99 · good 28.10 · good Fair
Tue 13:00 1.36 · high 4.54 · good 28.10 · good Fair
Tue 14:00 1.38 · high 5.05 · good 28.20 · good Fair
Tue 15:00 1.42 · high 5.24 · good 28.20 · good Fair
Tue 16:00 1.46 · high 5.35 · good 28.20 · good Fair
Tue 17:00 1.50 · high 5.28 · good 28.20 · good Fair
Tue 18:00 1.54 · high 5.75 · high 28.10 · good Poor
Tue 19:00 1.58 · high 6.33 · high 28.10 · good Poor
Tue 20:00 1.62 · high 6.24 · high 28.00 · good Poor
Tue 21:00 1.66 · high 6.26 · high 28.00 · good Poor
Tue 22:00 1.70 · high 6.53 · high 28.00 · good Poor
Tue 23:00 1.76 · high 6.66 · high 28.00 · good Poor
Wed 00:00 1.80 · high 6.43 · high 28.00 · good Poor