MARINE REPORT / 72 HOURS

Kerama Islands Snorkel Report Today

Japan · Updated Sun 08:01 (JST) · Source: Snapshot

The skinny

Marginal Data updated Sun 08:01 (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 · 0.0/10

Sun 08:00 (JST)

Later today

Fair · 4.3/10

Sun 18:00 (JST)

Next three days

Fair · 4.6/10

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 18:00

Main risk: Waves

Best morning signal: Sun 11:00 (Fair).

Best afternoon signal: Sun 18:00 (Fair). Peak afternoon wind is about 6.6 m/s.

Email me when it is good

Sunrise

06:31

Sunset

18:00

Water

28.0°C

Max air

27.6°C

Sky

Partly cloudy

46% 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 (0.46) · still limited by waves, wind
  • Sun 18:00: Fair (0.43) · still limited by waves, wind
  • Mon 11:00: Fair (0.42) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

  • Waves (71 hours)
  • Tide/current (60 hours)
  • Wind (43 hours)

Jellyfish drift risk

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

Low · 34/100

Low drift risk now.

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

⚠️ Fair

Advanced forecast data

Viewing historical data

Tue 08:00 – Fri 08:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.56 around Tue 16:00; 10 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 0.56m to 0.72m).

Wind is at or below 5.4m/s in 21/24 sampled hours (range 1.72 to 7.47m/s).

Tides range from 0.05m to 1.79m; 0 of 24 hours are in or near peak slack windows.

72-hour historical overview
Poor ❌ Limited
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Good 🌟 Good
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
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
Poor ❌ Limited
Poor ❌ Limited
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
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
Tue 08:00 0.70 · high 1.72 · good 28.30 · good Poor
Tue 09:00 0.70 · high 2.55 · good 28.30 · good Fair
Tue 10:00 0.68 · high 2.51 · good 28.40 · good Fair
Tue 11:00 0.68 · high 2.35 · good 28.50 · good Fair
Tue 12:00 0.66 · high 2.13 · good 28.60 · good Fair
Tue 13:00 0.64 · high 1.96 · good 28.70 · good Fair
Tue 14:00 0.64 · high 2.17 · good 28.80 · good Fair
Tue 15:00 0.62 · high 2.56 · good 28.80 · good Fair
Tue 16:00 0.60 · high 2.55 · good 28.80 · good Good
Tue 17:00 0.60 · high 2.85 · good 28.80 · good Fair
Tue 18:00 0.58 · high 2.97 · good 28.70 · good Fair
Tue 19:00 0.58 · high 3.34 · good 28.60 · good Poor
Tue 20:00 0.58 · high 3.71 · good 28.50 · good Poor
Tue 21:00 0.58 · high 3.30 · good 28.50 · good Poor
Tue 22:00 0.58 · high 3.45 · good 28.40 · good Poor
Tue 23:00 0.58 · high 3.06 · good 28.40 · good Poor
Wed 00:00 0.58 · high 2.74 · good 28.40 · good Poor
Wed 01:00 0.58 · high 2.53 · good 28.40 · good Poor
Wed 02:00 0.56 · high 2.20 · good 28.30 · good Poor
Wed 03:00 0.56 · high 2.59 · good 28.30 · good Poor
Wed 04:00 0.60 · high 5.06 · good 28.30 · good Poor
Wed 05:00 0.62 · high 5.86 · high 28.30 · good Poor
Wed 06:00 0.66 · high 7.47 · high 28.30 · good Poor
Wed 07:00 0.72 · high 7.27 · high 28.30 · good Poor
Wed 08:00 0.76 · high 7.31 · high 28.30 · good Poor
Wed 09:00 0.82 · high 7.08 · high 28.30 · good Fair
Wed 10:00 0.84 · high 7.42 · high 28.30 · good Fair
Wed 11:00 0.86 · high 7.54 · high 28.30 · good Poor
Wed 12:00 0.88 · high 7.72 · high 28.30 · good Poor
Wed 13:00 0.92 · high 8.21 · high 28.40 · good Poor
Wed 14:00 0.98 · high 8.86 · high 28.40 · good Poor
Wed 15:00 1.02 · high 8.28 · high 28.40 · good Poor
Wed 16:00 1.12 · high 9.85 · high 28.40 · good Poor
Wed 17:00 1.24 · high 9.90 · high 28.40 · good Poor
Wed 18:00 1.34 · high 9.77 · high 28.30 · good Poor
Wed 19:00 1.36 · high 9.45 · high 28.30 · good Poor
Wed 20:00 1.36 · high 9.19 · high 28.30 · good Poor
Wed 21:00 1.36 · high 8.56 · high 28.30 · good Poor
Wed 22:00 1.32 · high 7.59 · high 28.30 · good Poor
Wed 23:00 1.26 · high 6.64 · high 28.30 · good Poor
Thu 00:00 1.22 · high 7.11 · high 28.20 · good Poor
Thu 01:00 1.18 · high 6.70 · high 28.20 · good Poor
Thu 02:00 1.16 · high 6.18 · high 28.20 · good Poor
Thu 03:00 1.12 · high 5.91 · high 28.20 · good Poor
Thu 04:00 1.14 · high 6.32 · high 28.20 · good Poor
Thu 05:00 1.14 · high 6.92 · high 28.20 · good Poor
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