MARINE REPORT / 72 HOURS

Kerama Islands Snorkel Report Today

Japan · Updated Sun 23:41 (JST) · Source: Snapshot

The skinny

Marginal Data updated Sun 23:41 (JST)

Kerama Islands looks marginal today. The least-bad daylight window is around Mon 12:00, but waves is limiting the forecast.

Right now (forecast)

Poor · 0.0/10

Mon 00:00 (JST)

Later today

Fair · 4.3/10

Mon 12:00 (JST)

Next three days

Fair · 4.3/10

Mon 12:00 (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: Mon 12:00

Main risk: Waves

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

Best afternoon signal: Mon 12:00 (Fair). Peak afternoon wind is about 6.0 m/s.

Email me when it is good

Sunrise

06:31

Sunset

18:00

Water

27.9°C

Max air

27.2°C

Sky

Clear

17% 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

Monday

⚠️ Fair conditions

Main blocker: Waves

Tuesday

⚠️ Fair conditions

Main blocker: Waves

Wednesday

❌ Poor conditions

Main blocker: Waves

Best available hours

  • Mon 12:00: Fair (0.43) · still limited by waves, tide/current
  • Mon 17:00: Fair (0.42) · still limited by waves, wind
  • Mon 10:00: Fair (0.42) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

  • Waves (70 hours)
  • Tide/current (61 hours)
  • Wind (54 hours)

Jellyfish drift risk

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

Low · 34/100

Low peak drift risk around Mon 03:00.

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

Tue 15:00, Wed 16:00

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

Mon 00:00 – Thu 00:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.38 around Mon 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 0.76m to 1.16m).

Wind is at or below 5.4m/s in 1/24 sampled hours (range 5.23 to 9.91m/s).

Tides range from 0.03m to 1.95m; 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
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Fair ⚠️ Fair
Poor ❌ Limited
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
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
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
Mon 00:00 1.16 · high 6.01 · high 29.10 · good Poor
Mon 01:00 1.12 · high 6.35 · high 29.10 · good Poor
Mon 02:00 1.08 · high 6.26 · high 29.10 · good Poor
Mon 03:00 1.04 · high 6.96 · high 29.10 · good Poor
Mon 04:00 1.02 · high 6.93 · high 29.10 · good Poor
Mon 05:00 1.00 · high 6.69 · high 29.00 · good Poor
Mon 06:00 0.98 · high 7.59 · high 29.00 · good Poor
Mon 07:00 0.96 · high 7.96 · high 29.00 · good Poor
Mon 08:00 0.94 · high 7.77 · high 29.00 · good Poor
Mon 09:00 0.92 · high 7.92 · high 29.00 · good Poor
Mon 10:00 0.92 · high 7.89 · high 29.00 · good Poor
Mon 11:00 0.90 · high 7.60 · high 29.00 · good Fair
Mon 12:00 0.90 · high 7.35 · high 29.10 · good Fair
Mon 13:00 0.92 · high 8.46 · high 29.10 · good Fair
Mon 14:00 0.92 · high 8.52 · high 29.10 · good Fair
Mon 15:00 0.94 · high 9.91 · high 29.10 · good Poor
Mon 16:00 0.92 · high 8.52 · high 29.10 · good Poor
Mon 17:00 0.92 · high 7.10 · high 29.10 · good Poor
Mon 18:00 0.90 · high 6.37 · high 29.10 · good Fair
Mon 19:00 0.88 · high 6.02 · high 29.10 · good Poor
Mon 20:00 0.88 · high 5.76 · high 29.10 · good Poor
Mon 21:00 0.82 · high 5.23 · good 29.10 · good Poor
Mon 22:00 0.78 · high 5.88 · high 29.10 · good Poor
Mon 23:00 0.76 · high 6.71 · high 29.00 · good Poor
Tue 00:00 0.78 · high 6.19 · high 29.00 · good Poor
Tue 01:00 0.78 · high 6.28 · high 29.00 · good Poor
Tue 02:00 0.76 · high 5.88 · high 29.00 · good Poor
Tue 03:00 0.76 · high 6.53 · high 29.00 · good Poor
Tue 04:00 0.76 · high 6.36 · high 29.00 · good Poor
Tue 05:00 0.76 · high 6.52 · high 29.00 · good Poor
Tue 06:00 0.76 · high 6.55 · high 29.00 · good Poor
Tue 07:00 0.74 · high 6.15 · high 29.00 · good Poor
Tue 08:00 0.74 · high 5.58 · high 29.00 · good Poor
Tue 09:00 0.72 · high 5.39 · good 29.00 · good Fair
Tue 10:00 0.70 · high 5.63 · high 29.00 · good Fair
Tue 11:00 0.70 · high 5.67 · high 29.00 · good Fair
Tue 12:00 0.68 · high 5.83 · high 29.10 · good Poor
Tue 13:00 0.72 · high 5.77 · high 29.10 · good Poor
Tue 14:00 0.74 · high 5.93 · high 29.20 · good Poor
Tue 15:00 0.78 · high 6.22 · high 29.20 · good Poor
Tue 16:00 0.78 · high 6.86 · high 29.20 · good Poor
Tue 17:00 0.76 · high 6.94 · high 29.10 · good Poor
Tue 18:00 0.76 · high 6.54 · high 29.10 · good Poor
Tue 19:00 0.72 · high 5.88 · high 29.10 · good Poor
Tue 20:00 0.70 · high 4.90 · good 29.00 · good Poor
Tue 21:00 0.72 · high 4.26 · good 28.90 · good Poor
Tue 22:00 0.70 · high 4.03 · good 28.90 · good Poor
Tue 23:00 0.58 · high 5.45 · high 28.90 · good Poor
Wed 00:00 0.56 · high 5.52 · high 28.80 · good Poor
Wed 01:00 0.54 · high 5.43 · high 28.80 · good Poor
Wed 02:00 0.54 · high 5.12 · good 28.80 · good Poor
Wed 03:00 0.52 · high 5.15 · good 28.80 · good Poor
Wed 04:00 0.50 · high 4.68 · good 28.80 · good Poor
Wed 05:00 0.50 · high 4.99 · good 28.80 · good Poor
Wed 06:00 0.48 · high 4.28 · good 28.80 · good Poor
Wed 07:00 0.48 · high 4.26 · good 28.80 · good Poor
Wed 08:00 0.48 · high 6.30 · high 28.80 · good Poor
Wed 09:00 0.48 · high 5.20 · good 28.80 · good Fair
Wed 10:00 0.48 · high 4.96 · good 28.80 · good Fair
Wed 11:00 0.48 · high 4.36 · good 28.90 · good Fair
Wed 12:00 0.48 · high 4.67 · good 28.90 · good Fair
Wed 13:00 0.48 · high 5.23 · good 29.00 · good Fair
Wed 14:00 0.48 · high 5.66 · high 29.00 · good Fair
Wed 15:00 0.48 · high 5.30 · good 29.00 · good Fair
Wed 16:00 0.48 · high 5.03 · good 29.00 · good Fair
Wed 17:00 0.46 · high 5.13 · good 29.00 · good Fair
Wed 18:00 0.46 · high 4.91 · good 29.00 · good Fair
Wed 19:00 0.46 · high 5.03 · good 28.90 · good Poor
Wed 20:00 0.54 · high 5.06 · good 29.00 · good Poor
Wed 21:00 0.54 · high 3.63 · good 28.90 · good Poor
Wed 22:00 0.54 · high 3.20 · good 28.90 · good Poor
Wed 23:00 0.54 · high 2.47 · good 28.90 · good Poor