SnorkelForecast.com

Kerama Islands Snorkel Report Today

Japan · Updated Sat 05:03 (JST) · Source: Snapshot · Showing fallback/stale data

The skinny

Marginal Report Tue 09:29

Kerama Islands looks marginal today. The least-bad daylight window is around Tue 10:00, but waves is limiting the forecast.

Score: 4.8/10

Best time: Tue 10:00

Main risk: Waves

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

Best afternoon signal: Tue 12:00 (Fair). Peak afternoon wind is about 2.8 m/s.

Email me when it is good

Sunrise

05:50

Sunset

19:23

Water

28.2°C

Max air

27.7°C

Sky

Clear

4% cloud

No safe 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

Tuesday

⚠️ fair conditions

Main blocker: Waves

Best available hours

  • Tue 01:00 — Fair (0.48) · still limited by waves, tide/current
  • Tue 02:00 — Fair (0.47) · still limited by waves, tide/current
  • Tue 03:00 — Fair (0.47) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

  • Waves (4 hours)
  • Tide/current (4 hours)

Jellyfish drift risk

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

Low · 34/100

Low peak drift risk around Tue 11:00.

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 02:00

Nearby alternatives in Japan

Okinawa - Blue Cave

56 km away

✅ Good

Miyako

257 km away

⚠️ Fair

Ishigaki

381 km away

❌ Poor

Advanced forecast data

Viewing historical data

Thu 00:00 – Sun 00:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.35 around Thu 11:00; 1 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 0.98m to 1.16m).

Wind is at or below 5.4m/s in 4/24 sampled hours (range 4.14 to 7.6m/s).

Tides range from -0.17m to 2.03m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
poor ❌ Limited
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fair ⚠️ Fair
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poor ❌ Limited
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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 and safety gate (outside daylight scores lower).
Detailed hourly data table
Time Wave (m) Wind (m/s) Sea temp (°C) Status
Thu 00:00 1.06 · high 6.60 · high 26.90 · good poor
Thu 01:00 1.04 · high 6.20 · high 27.00 · good poor
Thu 02:00 1.02 · high 5.11 · good 27.10 · good fair
Thu 03:00 1.00 · high 4.41 · good 27.20 · good poor
Thu 04:00 1.00 · high 4.14 · good 27.30 · good poor
Thu 05:00 0.98 · high 4.78 · good 27.40 · good poor
Thu 06:00 0.98 · high 5.87 · high 27.50 · good poor
Thu 07:00 1.00 · high 6.49 · high 27.50 · good poor
Thu 08:00 1.00 · high 6.64 · high 27.50 · good poor
Thu 09:00 1.02 · high 7.04 · high 27.40 · good poor
Thu 10:00 1.06 · high 7.07 · high 27.40 · good poor
Thu 11:00 1.08 · high 6.49 · high 27.30 · good poor
Thu 12:00 1.12 · high 6.09 · high 27.30 · good poor
Thu 13:00 1.14 · high 6.05 · high 27.20 · good poor
Thu 14:00 1.14 · high 6.25 · high 27.20 · good poor
Thu 15:00 1.16 · high 6.76 · high 27.20 · good poor
Thu 16:00 1.16 · high 7.11 · high 27.20 · good poor
Thu 17:00 1.16 · high 7.11 · high 27.10 · good poor
Thu 18:00 1.16 · high 7.60 · high 27.10 · good poor
Thu 19:00 1.16 · high 7.44 · high 27.10 · good poor
Thu 20:00 1.14 · high 6.98 · high 27.10 · good poor
Thu 21:00 1.14 · high 7.22 · high 27.10 · good poor
Thu 22:00 1.14 · high 7.46 · high 27.10 · good poor
Thu 23:00 1.12 · high 6.84 · high 27.10 · good poor
Fri 00:00 1.12 · high 6.85 · high 27.10 · good poor
Fri 01:00 1.12 · high 5.81 · high 27.20 · good poor
Fri 02:00 1.12 · high 6.12 · high 27.20 · good poor
Fri 03:00 1.12 · high 7.00 · high 27.30 · good poor
Fri 04:00 1.12 · high 7.08 · high 27.40 · good poor
Fri 05:00 1.12 · high 6.95 · high 27.50 · good poor
Fri 06:00 1.12 · high 6.91 · high 27.50 · good poor
Fri 07:00 1.12 · high 6.92 · high 27.50 · good poor
Fri 08:00 1.14 · high 6.91 · high 27.50 · good poor
Fri 09:00 1.14 · high 6.89 · high 27.50 · good poor
Fri 10:00 1.12 · high 6.14 · high 27.50 · good poor
Fri 11:00 1.12 · high 5.63 · high 27.50 · good poor
Fri 12:00 1.10 · high 5.24 · good 27.50 · good poor
Fri 13:00 1.10 · high 5.13 · good 27.50 · good poor
Fri 14:00 1.10 · high 5.21 · good 27.40 · good poor
Fri 15:00 1.10 · high 5.84 · high 27.40 · good poor
Fri 16:00 1.12 · high 6.83 · high 27.40 · good poor
Fri 17:00 1.12 · high 6.65 · high 27.30 · good poor
Fri 18:00 1.14 · high 5.90 · high 27.30 · good poor
Fri 19:00 1.14 · high 6.20 · high 27.30 · good poor
Fri 20:00 1.14 · high 5.94 · high 27.30 · good poor
Fri 21:00 1.14 · high 6.05 · high 27.30 · good poor
Fri 22:00 1.14 · high 5.89 · high 27.30 · good poor
Fri 23:00 1.14 · high 5.27 · good 27.30 · good poor
Sat 00:00 1.14 · high 5.42 · high 27.30 · good poor
Sat 01:00 1.14 · high 5.15 · good 27.40 · good fair
Sat 02:00 1.16 · high 5.99 · high 27.40 · good poor
Sat 03:00 1.16 · high 5.31 · good 27.50 · good fair
Sat 04:00 1.16 · high 5.33 · good 27.50 · good poor
Sat 05:00 1.16 · high 5.80 · high 27.60 · good poor
Sat 06:00 0.98 · high 6.47 · high 28.20 · good fair
Sat 07:00 0.98 · high 6.01 · high 28.20 · good fair
Sat 08:00 0.96 · high 5.76 · high 28.20 · good fair
Sat 09:00 0.96 · high 5.14 · good 28.20 · good fair
Sat 10:00 0.96 · high 4.92 · good 28.10 · good fair
Sat 11:00 0.96 · high 4.98 · good 28.10 · good poor
Sat 12:00 0.96 · high 4.97 · good 28.10 · good poor
Sat 13:00 0.98 · high 4.83 · good 28.10 · good poor
Sat 14:00 1.00 · high 5.06 · good 28.00 · good poor
Sat 15:00 1.02 · high 5.16 · good 28.00 · good poor
Sat 16:00 1.04 · high 4.82 · good 28.00 · good poor
Sat 17:00 1.06 · high 4.34 · good 27.90 · good poor
Sat 18:00 1.08 · high 3.99 · good 27.90 · good poor
Sat 19:00 1.08 · high 3.20 · good 27.90 · good poor
Sat 20:00 1.10 · high 2.82 · good 27.90 · good poor
Sat 21:00 1.10 · high 2.31 · good 27.90 · good poor
Sat 22:00 1.10 · high 1.66 · good 27.90 · good poor
Sat 23:00 1.10 · high 1.31 · good 27.90 · good poor