SnorkelForecast.com

Kerama Islands Snorkel Report Today

Japan · Updated Wed 03:22 (JST) · Source: Snapshot

The skinny

Marginal Report Wed 12:41

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

Score: 3.7/10

Best time: Sat 10:00

Main risk: Waves

No useful morning window is showing yet.

Best afternoon signal: Wed 16:00 (Fair). Peak afternoon wind is about 7.0 m/s.

Email me when it is good

Sunrise

06:11

Sunset

18:50

Water

28.6°C

Max air

28.0°C

Sky

Cloudy

99% 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

Wednesday

⚠️ Fair conditions

Main blocker: Waves

Thursday

❌ Poor conditions

Main blocker: Waves

Friday

⚠️ Fair conditions

Main blocker: Waves

Best available hours

  • Sat 01:00: Fair (0.47) · still limited by waves, tide/current
  • Sat 00:00: Fair (0.47) · still limited by waves, tide/current
  • Sat 02:00: Fair (0.43) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

  • Waves (71 hours)
  • Tide/current (64 hours)
  • Wind (49 hours)

Jellyfish drift risk

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

Low · 34/100

Low peak drift risk around Wed 15:00.

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

Wed 12:00, Thu 13:00, Fri 03:00, Fri 14:00

Nearby alternatives in Japan

Okinawa - Blue Cave

56 km away

❌ Poor

Miyako

257 km away

❌ Poor

Ishigaki

381 km away

❌ Poor

Advanced forecast data

Viewing historical data

Tue 03:00 – Fri 03:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.27 around Tue 18:00; 0 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 1.44m to 1.94m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 7.18 to 11.43m/s).

Tides range from 0.28m to 1.92m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
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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 is better in daylight, so night hours score lower.
Detailed hourly data table
Time Wave (m) Wind (m/s) Sea temp (°C) Status
Tue 03:00 1.92 · high 11.43 · high 28.40 · good Poor
Tue 04:00 1.92 · high 11.11 · high 28.40 · good Poor
Tue 05:00 1.94 · high 10.19 · high 28.40 · good Poor
Tue 06:00 1.94 · high 7.54 · high 28.40 · good Poor
Tue 07:00 1.90 · high 8.00 · high 28.40 · good Poor
Tue 08:00 1.88 · high 8.00 · high 28.40 · good Poor
Tue 09:00 1.84 · high 8.52 · high 28.40 · good Poor
Tue 10:00 1.84 · high 8.43 · high 28.30 · good Poor
Tue 11:00 1.44 · high 7.61 · high 28.60 · good Poor
Tue 12:00 1.46 · high 8.40 · high 28.60 · good Poor
Tue 13:00 1.50 · high 8.49 · high 28.60 · good Poor
Tue 14:00 1.56 · high 9.32 · high 28.60 · good Poor
Tue 15:00 1.60 · high 8.85 · high 28.50 · good Poor
Tue 16:00 1.66 · high 8.86 · high 28.50 · good Poor
Tue 17:00 1.72 · high 8.78 · high 28.50 · good Poor
Tue 18:00 1.78 · high 7.59 · high 28.50 · good Poor
Tue 19:00 1.84 · high 7.18 · high 28.50 · good Poor
Tue 20:00 1.52 · high 7.25 · high 28.50 · good Poor
Tue 21:00 1.54 · high 8.67 · high 28.50 · good Poor
Tue 22:00 1.54 · high 8.22 · high 28.50 · good Poor
Tue 23:00 1.56 · high 8.03 · high 28.50 · good Poor
Wed 00:00 1.56 · high 8.57 · high 28.50 · good Poor
Wed 01:00 1.56 · high 8.64 · high 28.50 · good Poor
Wed 02:00 1.58 · high 8.59 · high 28.50 · good Poor
Wed 03:00 1.58 · high 9.15 · high 28.50 · good Poor
Wed 04:00 1.60 · high 7.72 · high 28.50 · good Poor
Wed 05:00 1.62 · high 6.75 · high 28.50 · good Poor
Wed 06:00 1.64 · high 7.89 · high 28.50 · good Poor
Wed 07:00 1.66 · high 7.39 · high 28.50 · good Poor
Wed 08:00 1.66 · high 8.01 · high 28.50 · good Poor
Wed 09:00 1.68 · high 6.65 · high 28.50 · good Poor
Wed 10:00 1.70 · high 7.52 · high 28.50 · good Poor
Wed 11:00 1.72 · high 7.19 · high 28.70 · good Poor
Wed 12:00 1.70 · high 7.47 · high 28.70 · good Poor
Wed 13:00 1.70 · high 7.39 · high 28.70 · good Poor
Wed 14:00 1.68 · high 6.60 · high 28.70 · good Poor
Wed 15:00 1.68 · high 7.35 · high 28.70 · good Poor
Wed 16:00 1.68 · high 6.72 · high 28.60 · good Poor
Wed 17:00 1.66 · high 5.83 · high 28.60 · good Poor
Wed 18:00 1.66 · high 6.22 · high 28.60 · good Poor
Wed 19:00 1.66 · high 6.88 · high 28.60 · good Poor
Wed 20:00 1.62 · high 4.96 · good 28.60 · good Poor
Wed 21:00 1.62 · high 5.82 · high 28.60 · good Poor
Wed 22:00 1.64 · high 6.51 · high 28.60 · good Poor
Wed 23:00 1.64 · high 6.83 · high 28.70 · good Poor
Thu 00:00 1.66 · high 6.95 · high 28.70 · good Poor
Thu 01:00 1.70 · high 6.96 · high 28.70 · good Poor
Thu 02:00 1.72 · high 6.98 · high 28.80 · good Poor
Thu 03:00 1.76 · high 6.70 · high 28.80 · good Poor
Thu 04:00 1.78 · high 7.34 · high 28.90 · good Fair
Thu 05:00 1.78 · high 7.56 · high 28.90 · good Poor
Thu 06:00 1.80 · high 6.70 · high 28.90 · good Poor
Thu 07:00 1.78 · high 7.76 · high 28.90 · good Poor
Thu 08:00 1.78 · high 7.53 · high 28.90 · good Poor
Thu 09:00 1.76 · high 7.80 · high 28.90 · good Poor
Thu 10:00 1.76 · high 7.07 · high 28.80 · good Poor
Thu 11:00 1.52 · high 6.65 · high 28.80 · good Poor
Thu 12:00 1.52 · high 7.15 · high 28.80 · good Poor
Thu 13:00 1.54 · high 6.82 · high 28.80 · good Poor
Thu 14:00 1.54 · high 7.32 · high 28.80 · good Poor
Thu 15:00 1.56 · high 7.82 · high 28.70 · good Poor
Thu 16:00 1.58 · high 7.70 · high 28.70 · good Poor
Thu 17:00 1.62 · high 7.02 · high 28.70 · good Poor
Thu 18:00 1.64 · high 7.37 · high 28.70 · good Poor
Thu 19:00 1.66 · high 7.12 · high 28.70 · good Poor
Thu 20:00 1.76 · high 8.25 · high 28.70 · good Poor
Thu 21:00 1.78 · high 7.83 · high 28.70 · good Poor
Thu 22:00 1.80 · high 7.39 · high 28.70 · good Poor
Thu 23:00 1.80 · high 7.98 · high 28.70 · good Poor
Fri 00:00 1.82 · high 8.27 · high 28.70 · good Poor
Fri 01:00 1.82 · high 8.01 · high 28.70 · good Poor
Fri 02:00 1.84 · high 7.25 · high 28.70 · good Poor