SnorkelForecast.com

Kerama Islands Snorkel Report Today

Japan · Updated Tue 04:14 (JST) · Source: Snapshot · Showing fallback/stale data

The skinny

Go in the best window Report Thu 07:45

Kerama Islands has a usable snorkeling window around Thu 09:00. The main thing to watch is waves.

Score: 7.0/10

Best time: Thu 09:00

Main risk: Waves

Best morning signal: Thu 11:00 (Good).

Best afternoon signal: Thu 12:00 (Good). Peak afternoon wind is about 2.4 m/s.

Email me when it is good

Sunrise

05:51

Sunset

19:23

Water

28.7°C

Max air

28.3°C

Sky

Clear

5% cloud

Good window is available today

Next safe window: Thu 00:00–10:00 (38% of next 72h are suitable)

3-day planner Best available Show data

3-day planner

Thursday

✅ good conditions

Main blocker: Waves

Friday

⚠️ fair conditions

Main blocker: Waves

Best available hours

Next safe window starts at Thu 00:00 until 10:00.

Why this verdict

Main blockers across the next 72 hours:

  • Waves (29 hours)
  • Tide/current (24 hours)
  • Darkness (14 hours)

Jellyfish drift risk

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

Low · 31/100

Low peak drift risk around Thu 13:00.

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.

Nearby alternatives in Japan

Okinawa - Blue Cave

56 km away

✅ Good

Miyako

257 km away

✅ Good

Ishigaki

381 km away

✅ Good

Advanced forecast data

Viewing historical data

Fri 22:00 – Mon 22:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.0 around Sat 07:00; 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 1.26m to 1.72m).

Wind is at or below 5.4m/s in 4/24 sampled hours (range 0.9 to 31.1m/s).

Tides range from 0.15m to 1.59m; 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 and safety gate (outside daylight scores lower).
Detailed hourly data table
Time Wave (m) Wind (m/s) Sea temp (°C) Status
Fri 22:00 1.68 · high 31.10 · high 26.50 · good poor
Fri 23:00 1.70 · high 26.60 · high 26.50 · good poor
Sat 00:00 1.72 · high 22.80 · high 26.60 · good poor
Sat 01:00 1.70 · high 17.80 · high 26.60 · good poor
Sat 02:00 1.66 · high 16.30 · high 26.70 · good poor
Sat 03:00 1.64 · high 12.30 · high 26.80 · good poor
Sat 04:00 1.60 · high 9.50 · high 26.90 · good poor
Sat 05:00 1.54 · high 5.40 · good 26.90 · good poor
Sat 06:00 1.50 · high 6.70 · high 27.00 · good poor
Sat 07:00 1.46 · high 7.20 · high 27.00 · good poor
Sat 08:00 1.42 · high 7.20 · high 27.00 · good poor
Sat 09:00 1.38 · high 6.90 · high 27.00 · good poor
Sat 10:00 1.34 · high 3.80 · good 27.00 · good poor
Sat 11:00 1.30 · high 0.90 · good 26.90 · good poor
Sat 12:00 1.26 · high 4.20 · good 26.90 · good poor
Sat 13:00 1.42 · high 14.70 · high 26.40 · good poor
Sat 14:00 1.42 · high 16.30 · high 26.40 · good poor
Sat 15:00 1.42 · high 15.10 · high 26.40 · good poor
Sat 16:00 1.42 · high 14.20 · high 26.40 · good poor
Sat 17:00 1.40 · high 23.00 · high 26.30 · good poor
Sat 18:00 1.40 · high 24.90 · high 26.30 · good poor
Sat 19:00 1.40 · high 25.00 · high 26.30 · good poor
Sat 20:00 1.38 · high 25.70 · high 26.30 · good poor
Sat 21:00 1.38 · high 23.60 · high 26.30 · good poor
Sat 22:00 1.36 · high 22.80 · high 26.30 · good poor
Sat 23:00 1.36 · high 22.10 · high 26.30 · good poor
Sun 00:00 1.34 · high 25.30 · high 26.30 · good poor
Sun 01:00 1.34 · high 27.20 · high 26.30 · good poor
Sun 02:00 1.36 · high 25.50 · high 26.30 · good poor
Sun 03:00 1.36 · high 29.00 · high 26.30 · good poor
Sun 04:00 1.36 · high 31.90 · high 26.30 · good poor
Sun 05:00 1.34 · high 30.50 · high 26.30 · good poor
Sun 06:00 1.34 · high 23.70 · high 26.30 · good poor
Sun 07:00 1.34 · high 26.10 · high 26.30 · good poor
Sun 08:00 1.32 · high 26.60 · high 26.30 · good poor
Sun 09:00 1.32 · high 22.60 · high 26.30 · good poor
Sun 10:00 1.30 · high 20.90 · high 26.30 · good poor
Sun 11:00 1.28 · high 21.20 · high 26.30 · good poor
Sun 12:00 1.26 · high 19.40 · high 26.30 · good poor
Sun 13:00 1.22 · high 19.80 · high 26.30 · good poor
Sun 14:00 1.20 · high 19.30 · high 26.30 · good poor
Sun 15:00 1.16 · high 18.30 · high 26.20 · good poor
Sun 16:00 1.14 · high 19.40 · high 26.20 · good poor
Sun 17:00 1.12 · high 21.90 · high 26.20 · good poor
Sun 18:00 1.10 · high 20.40 · high 26.20 · good poor
Sun 19:00 1.08 · high 19.00 · high 26.20 · good poor
Sun 20:00 1.06 · high 19.70 · high 26.20 · good poor
Sun 21:00 1.04 · high 20.90 · high 26.20 · good poor
Sun 22:00 1.04 · high 15.30 · high 26.20 · good poor
Sun 23:00 1.02 · high 19.50 · high 26.30 · good poor
Mon 00:00 1.02 · high 20.90 · high 26.30 · good poor
Mon 01:00 1.02 · high 19.00 · high 26.30 · good poor
Mon 02:00 1.00 · high 18.90 · high 26.40 · good poor
Mon 03:00 1.00 · high 18.70 · high 26.40 · good poor
Mon 04:00 0.98 · high 17.80 · high 26.50 · good poor
Mon 05:00 0.96 · high 17.90 · high 26.50 · good poor
Mon 06:00 0.94 · high 16.00 · high 26.50 · good poor
Mon 07:00 0.92 · high 14.10 · high 26.50 · good poor
Mon 08:00 0.92 · high 13.70 · high 26.50 · good poor
Mon 09:00 0.90 · high 12.20 · high 26.50 · good poor
Mon 10:00 0.88 · high 10.70 · high 26.50 · good poor
Mon 11:00 0.86 · high 13.10 · high 26.40 · good poor
Mon 12:00 0.84 · high 14.80 · high 26.40 · good poor
Mon 13:00 0.84 · high 13.60 · high 26.40 · good poor
Mon 14:00 0.82 · high 13.80 · high 26.40 · good poor
Mon 15:00 0.82 · high 15.10 · high 26.40 · good poor
Mon 16:00 0.82 · high 15.10 · high 26.40 · good poor
Mon 17:00 0.80 · high 15.30 · high 26.40 · good poor
Mon 18:00 0.80 · high 17.50 · high 26.40 · good poor
Mon 19:00 0.80 · high 16.70 · high 26.40 · good poor
Mon 20:00 0.78 · high 15.70 · high 26.40 · good poor
Mon 21:00 0.78 · high 16.30 · high 26.40 · good poor