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 04:00 (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

16% 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 (68 hours)
  • Tide/current (61 hours)
  • Wind (41 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 historical data

Sat 04:00 – Tue 04:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.41 around Sat 12:00; 5 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 1.04m to 1.24m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 7.67 to 9.53m/s).

Tides range from 0.34m to 1.43m; 1 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
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
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
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
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
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
Sun 06:00 1.16 · high 7.13 · high 28.10 · good Poor
Sun 07:00 1.20 · high 7.42 · high 28.10 · good Poor
Sun 08:00 1.18 · high 7.41 · high 28.10 · good Poor
Sun 09:00 1.18 · high 7.34 · high 28.10 · good Fair
Sun 10:00 1.16 · high 7.03 · high 28.10 · good Fair
Sun 11:00 1.12 · high 6.22 · high 28.20 · good Fair
Sun 12:00 1.10 · high 4.90 · good 28.20 · good Fair
Sun 13:00 1.04 · high 4.55 · good 28.30 · good Fair
Sun 14:00 1.00 · high 4.35 · good 28.30 · good Fair
Sun 15:00 0.94 · high 4.82 · good 28.30 · good Fair
Sun 16:00 0.90 · high 5.46 · high 28.30 · good Fair
Sun 17:00 0.88 · high 5.87 · high 28.30 · good Fair
Sun 18:00 0.84 · high 6.21 · high 28.30 · good Fair
Sun 19:00 0.88 · high 7.00 · high 28.10 · good Poor
Sun 20:00 0.86 · high 6.96 · high 28.10 · good Poor
Sun 21:00 0.84 · high 6.66 · high 28.10 · good Poor
Sun 22:00 0.82 · high 6.40 · high 28.10 · good Poor
Sun 23:00 0.80 · high 6.60 · high 28.00 · good Poor
Mon 00:00 0.78 · high 6.06 · high 28.00 · good Poor
Mon 01:00 0.76 · high 5.25 · good 28.00 · good Poor
Mon 02:00 0.76 · high 4.95 · good 28.00 · good Poor
Mon 03:00 0.74 · high 4.80 · good 28.00 · good Poor
Mon 04:00 0.74 · high 4.54 · good 28.00 · good Poor
Mon 05:00 0.72 · high 4.66 · good 27.90 · good Poor
Mon 06:00 0.72 · high 4.60 · good 27.90 · good Poor
Mon 07:00 0.72 · high 4.60 · good 27.90 · good Poor
Mon 08:00 0.76 · high 5.60 · high 27.90 · good Poor
Mon 09:00 0.76 · high 5.55 · high 27.90 · good Fair
Mon 10:00 0.76 · high 5.40 · good 28.00 · good Fair
Mon 11:00 0.76 · high 4.79 · good 28.00 · good Fair
Mon 12:00 0.76 · high 3.78 · good 28.10 · good Fair
Mon 13:00 0.76 · high 3.13 · good 28.20 · good Fair
Mon 14:00 0.78 · high 3.66 · good 28.20 · good Fair
Mon 15:00 0.78 · high 3.92 · good 28.30 · good Fair
Mon 16:00 0.80 · high 4.57 · good 28.30 · good Fair
Mon 17:00 0.84 · high 5.19 · good 28.20 · good Fair
Mon 18:00 0.86 · high 5.34 · good 28.20 · good Poor
Mon 19:00 0.88 · high 5.66 · high 28.20 · good Poor
Mon 20:00 0.92 · high 6.06 · high 28.10 · good Poor
Mon 21:00 0.94 · high 6.57 · high 28.10 · good Poor
Mon 22:00 0.96 · high 6.49 · high 28.10 · good Poor
Mon 23:00 0.96 · high 6.51 · high 28.00 · good Poor
Tue 00:00 0.98 · high 6.22 · high 28.00 · good Poor
Tue 01:00 0.98 · high 5.71 · high 28.00 · good Poor
Tue 02:00 1.00 · high 5.14 · good 28.00 · good Poor
Tue 03:00 1.00 · high 5.31 · good 28.00 · good Poor