MARINE REPORT / 72 HOURS

Kerama Islands Snorkel Report Today

Japan · Updated Sun 11:08 (JST) · Source: Snapshot

The skinny

Marginal Data updated Sun 11:08 (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 · 3.1/10

Sun 12:00 (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

27.0°C

Sky

Cloudy

100% 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 (70 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

Fri 12:00 – Mon 12:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.43 around Sat 09:00; 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 0.74m to 1.24m).

Wind is at or below 5.4m/s in 10/24 sampled hours (range 3.08 to 10.37m/s).

Tides range from 0.13m to 1.87m; 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
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
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
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
Fair ⚠️ Fair
Good 🌟 Good
Good 🌟 Good
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
Fri 12:00 1.24 · high 7.74 · high 28.20 · good Poor
Fri 13:00 1.20 · high 8.96 · high 28.20 · good Poor
Fri 14:00 1.14 · high 10.37 · high 28.20 · good Poor
Fri 15:00 1.10 · high 9.84 · high 28.20 · good Poor
Fri 16:00 1.08 · high 10.23 · high 28.20 · good Poor
Fri 17:00 1.06 · high 9.81 · high 28.20 · good Poor
Fri 18:00 1.04 · high 8.87 · high 28.20 · good Poor
Fri 19:00 1.04 · high 8.18 · high 28.20 · good Poor
Fri 20:00 1.20 · high 8.63 · high 28.20 · good Poor
Fri 21:00 1.16 · high 8.55 · high 28.20 · good Poor
Fri 22:00 1.12 · high 8.07 · high 28.20 · good Poor
Fri 23:00 1.10 · high 7.19 · high 28.20 · good Poor
Sat 00:00 1.06 · high 6.81 · high 28.20 · good Poor
Sat 01:00 1.00 · high 5.75 · high 28.20 · good Poor
Sat 02:00 0.98 · high 4.92 · good 28.20 · good Poor
Sat 03:00 0.94 · high 4.88 · good 28.20 · good Poor
Sat 04:00 0.90 · high 4.86 · good 28.20 · good Poor
Sat 05:00 0.86 · high 4.67 · good 28.20 · good Poor
Sat 06:00 0.82 · high 4.30 · good 28.20 · good Poor
Sat 07:00 0.80 · high 4.05 · good 28.20 · good Poor
Sat 08:00 0.78 · high 3.99 · good 28.20 · good Poor
Sat 09:00 0.76 · high 4.62 · good 28.20 · good Fair
Sat 10:00 0.74 · high 4.85 · good 28.20 · good Fair
Sat 11:00 0.74 · high 3.08 · good 28.20 · good Fair
Sat 12:00 0.72 · high 2.84 · good 28.30 · good Fair
Sat 13:00 0.72 · high 2.96 · good 28.30 · good Fair
Sat 14:00 0.70 · high 2.92 · good 28.40 · good Fair
Sat 15:00 0.70 · high 2.06 · good 28.40 · good Fair
Sat 16:00 0.70 · high 2.49 · good 28.40 · good Fair
Sat 17:00 0.70 · high 3.50 · good 28.40 · good Fair
Sat 18:00 0.70 · high 3.05 · good 28.30 · good Fair
Sat 19:00 0.70 · high 3.32 · good 28.30 · good Poor
Sat 20:00 0.68 · high 3.62 · good 28.40 · good Poor
Sat 21:00 0.68 · high 4.08 · good 28.40 · good Poor
Sat 22:00 0.70 · high 4.65 · good 28.40 · good Poor
Sat 23:00 0.72 · high 5.18 · good 28.30 · good Poor
Sun 00:00 0.74 · high 5.86 · high 28.30 · good Poor
Sun 01:00 0.74 · high 3.56 · good 28.30 · good Poor
Sun 02:00 0.74 · high 4.34 · good 28.30 · good Poor
Sun 03:00 0.76 · high 3.49 · good 28.30 · good Poor
Sun 04:00 0.78 · high 4.05 · good 28.30 · good Poor
Sun 05:00 0.80 · high 3.98 · good 28.20 · good Poor
Sun 06:00 0.82 · high 3.27 · good 28.20 · good Poor
Sun 07:00 0.82 · high 3.81 · good 28.20 · good Poor
Sun 08:00 0.84 · high 2.44 · good 28.20 · good Poor
Sun 09:00 0.84 · high 3.53 · good 28.20 · good Fair
Sun 10:00 0.84 · high 4.40 · good 28.30 · good Fair
Sun 11:00 0.82 · high 3.46 · good 28.30 · good Fair
Sun 12:00 0.82 · high 2.27 · good 28.40 · good Fair
Sun 13:00 0.82 · high 3.27 · good 28.40 · good Poor
Sun 14:00 0.84 · high 2.26 · good 28.50 · good Fair
Sun 15:00 0.84 · high 2.50 · good 28.50 · good Fair
Sun 16:00 0.86 · high 2.21 · good 28.50 · good Fair
Sun 17:00 0.86 · high 1.12 · good 28.50 · good Fair
Sun 18:00 0.88 · high 1.47 · good 28.50 · good Fair
Sun 19:00 0.90 · high 3.31 · good 28.40 · good Poor
Sun 20:00 0.76 · high 4.05 · good 28.40 · good Poor
Sun 21:00 0.76 · high 4.68 · good 28.40 · good Poor
Sun 22:00 0.78 · high 3.65 · good 28.40 · good Poor
Sun 23:00 0.78 · high 4.72 · good 28.30 · good Poor
Mon 00:00 0.80 · high 5.26 · good 28.30 · good Poor
Mon 01:00 0.72 · high 3.18 · good 28.30 · good Poor
Mon 02:00 0.72 · high 2.81 · good 28.30 · good Poor
Mon 03:00 0.72 · high 4.46 · good 28.30 · good Poor
Mon 04:00 0.72 · high 3.88 · good 28.30 · good Poor
Mon 05:00 0.72 · high 2.83 · good 28.30 · good Poor
Mon 06:00 0.72 · high 2.38 · good 28.30 · good Poor
Mon 07:00 0.72 · high 2.69 · good 28.30 · good Poor
Mon 08:00 0.70 · high 3.41 · good 28.30 · good Poor
Mon 09:00 0.70 · high 1.06 · good 28.30 · good Fair
Mon 10:00 0.70 · high 1.28 · good 28.40 · good Good
Mon 11:00 0.68 · high 0.56 · good 28.40 · good Good