MARINE REPORT / 72 HOURS

Kerama Islands Snorkel Report Today

Japan · Updated Sun 04:54 (JST) · Source: Snapshot

The skinny

Marginal Data updated Sun 04:54 (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 06:00 (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

Clear

20% 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 (60 hours)
  • Wind (43 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

Next early morning high tide: Wed 02:00

Sun 12:00, Sun 22:00, Tue 15:00, Wed 02:00

Nearby alternatives in Japan

Okinawa - Blue Cave

56 km away

✅ Good

Miyako

257 km away

❌ Poor

Ishigaki

381 km away

❌ Poor

Advanced forecast data

Viewing historical data

Thu 06:00 – Sun 06:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.42 around Thu 10:00; 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 0.72m to 1.24m).

Wind is at or below 5.4m/s in 5/24 sampled hours (range 4.0 to 8.66m/s).

Tides range from 0.22m to 1.63m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
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
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
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
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
Fair ⚠️ Fair
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
Thu 06:00 1.16 · high 7.74 · high 28.20 · good Poor
Thu 07:00 1.18 · high 8.58 · high 28.20 · good Poor
Thu 08:00 1.22 · high 8.49 · high 28.20 · good Poor
Thu 09:00 1.24 · high 8.66 · high 28.20 · good Poor
Thu 10:00 1.20 · high 8.22 · high 28.20 · good Fair
Thu 11:00 1.18 · high 7.86 · high 28.20 · good Fair
Thu 12:00 1.14 · high 7.71 · high 28.30 · good Fair
Thu 13:00 1.10 · high 7.78 · high 28.30 · good Fair
Thu 14:00 1.08 · high 8.28 · high 28.30 · good Poor
Thu 15:00 1.04 · high 7.73 · high 28.30 · good Fair
Thu 16:00 1.02 · high 7.66 · high 28.30 · good Fair
Thu 17:00 1.02 · high 7.61 · high 28.30 · good Poor
Thu 18:00 1.00 · high 7.29 · high 28.30 · good Fair
Thu 19:00 0.98 · high 6.51 · high 28.20 · good Poor
Thu 20:00 0.96 · high 5.95 · high 28.20 · good Poor
Thu 21:00 0.92 · high 6.02 · high 28.20 · good Poor
Thu 22:00 0.88 · high 6.01 · high 28.20 · good Poor
Thu 23:00 0.86 · high 5.88 · high 28.20 · good Poor
Fri 00:00 0.82 · high 5.46 · high 28.20 · good Poor
Fri 01:00 0.82 · high 4.56 · good 28.20 · good Poor
Fri 02:00 0.78 · high 4.00 · good 28.20 · good Poor
Fri 03:00 0.76 · high 4.32 · good 28.20 · good Poor
Fri 04:00 0.74 · high 4.25 · good 28.20 · good Poor
Fri 05:00 0.72 · high 4.32 · good 28.20 · good Poor
Fri 06:00 0.70 · high 4.49 · good 28.10 · good Poor
Fri 07:00 0.68 · high 4.50 · good 28.10 · good Poor
Fri 08:00 0.68 · high 4.09 · good 28.10 · good Poor
Fri 09:00 0.66 · high 5.24 · good 28.10 · good Fair
Fri 10:00 0.64 · high 4.68 · good 28.10 · good Fair
Fri 11:00 0.64 · high 4.33 · good 28.20 · good Fair
Fri 12:00 0.62 · high 4.21 · good 28.20 · good Fair
Fri 13:00 0.60 · high 4.26 · good 28.30 · good Fair
Fri 14:00 0.60 · high 3.35 · good 28.30 · good Fair
Fri 15:00 0.58 · high 5.58 · high 28.30 · good Fair
Fri 16:00 0.58 · high 5.81 · high 28.30 · good Fair
Fri 17:00 0.58 · high 6.64 · high 28.30 · good Fair
Fri 18:00 0.58 · high 7.07 · high 28.30 · good Fair
Fri 19:00 0.60 · high 7.20 · high 28.20 · good Poor
Fri 20:00 0.82 · high 7.57 · high 28.30 · good Poor
Fri 21:00 0.86 · high 7.47 · high 28.20 · good Poor
Fri 22:00 0.90 · high 7.62 · high 28.20 · good Poor
Fri 23:00 0.96 · high 7.56 · high 28.20 · good Poor
Sat 00:00 1.00 · high 7.27 · high 28.20 · good Poor
Sat 01:00 1.02 · high 7.14 · high 28.10 · good Poor
Sat 02:00 1.04 · high 7.82 · high 28.10 · good Poor
Sat 03:00 1.06 · high 7.96 · high 28.10 · good Poor
Sat 04:00 1.06 · high 8.42 · high 28.10 · good Poor
Sat 05:00 1.04 · high 8.45 · high 28.10 · good Poor
Sat 06:00 1.10 · high 8.65 · high 28.10 · good Poor
Sat 07:00 1.14 · high 9.24 · high 28.10 · good Poor
Sat 08:00 1.16 · high 9.45 · high 28.10 · good Poor
Sat 09:00 1.20 · high 9.12 · high 28.10 · good Poor
Sat 10:00 1.20 · high 8.93 · high 28.20 · good Poor
Sat 11:00 1.18 · high 9.05 · high 28.20 · good Poor
Sat 12:00 1.18 · high 8.47 · high 28.20 · good Fair
Sat 13:00 1.16 · high 8.06 · high 28.30 · good Fair
Sat 14:00 1.12 · high 7.67 · high 28.30 · good Fair
Sat 15:00 1.10 · high 8.21 · high 28.30 · good Fair
Sat 16:00 1.06 · high 8.49 · high 28.30 · good Poor
Sat 17:00 1.04 · high 8.65 · high 28.30 · good Poor
Sat 18:00 1.18 · high 8.61 · high 28.20 · good Fair
Sat 19:00 1.20 · high 9.53 · high 28.20 · good Poor
Sat 20:00 1.22 · high 9.42 · high 28.10 · good Poor
Sat 21:00 1.24 · high 8.98 · high 28.10 · good Poor
Sat 22:00 1.24 · high 8.95 · high 28.10 · good Poor
Sat 23:00 1.24 · high 9.25 · high 28.10 · good Poor
Sun 00:00 1.24 · high 8.96 · high 28.10 · good Poor
Sun 01:00 1.24 · high 8.71 · high 28.10 · good Poor
Sun 02:00 1.24 · high 8.65 · high 28.10 · good Poor
Sun 03:00 1.24 · high 8.40 · high 28.10 · good Poor
Sun 04:00 1.22 · high 8.15 · high 28.10 · good Poor
Sun 05:00 1.18 · high 7.67 · high 28.10 · good Poor