SnorkelForecast.com

Kerama Islands Snorkel Report Today

Japan · Updated Tue 04:14 (JST) · Source: Snapshot

The skinny

Go in the best window Report Wed 08:02

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

Score: 6.3/10

Best time: Wed 09:00

Main risk: Waves

Best morning signal: Wed 10:00 (Good).

Best afternoon signal: Wed 14:00 (Good). Peak afternoon wind is about 2.2 m/s.

Email me when it is good

Sunrise

05:51

Sunset

19:23

Water

28.6°C

Max air

28.1°C

Sky

Clear

3% cloud

Good window is available today

Next safe window: Wed 00:00–01:00 (38% of next 72h are suitable)

3-day planner Best available Show data

3-day planner

Wednesday

✅ good conditions

Main blocker: Waves

Thursday

✅ good conditions

Main blocker: Waves

Friday

⚠️ fair conditions

Main blocker: Waves

Best available hours

Next safe window starts at Wed 00:00 until 01:00.

Why this verdict

Main blockers across the next 72 hours:

  • Waves (52 hours)
  • Tide/current (45 hours)
  • Darkness (26 hours)

Jellyfish drift risk

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

Low · 32/100

Low peak drift risk around Thu 00:00.

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 04:00

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

Sat 23:00 – Tue 23:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.31 around Sun 10:00; 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 2.16m to 3.44m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 7.59 to 10.83m/s).

Tides range from 0.0m to 1.86m; 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
Sat 23:00 3.44 · high 10.60 · high 27.50 · good poor
Sun 00:00 3.34 · high 10.83 · high 27.50 · good poor
Sun 01:00 3.22 · high 9.83 · high 27.50 · good poor
Sun 02:00 3.12 · high 9.36 · high 27.60 · good poor
Sun 03:00 3.00 · high 9.19 · high 27.60 · good poor
Sun 04:00 2.88 · high 9.04 · high 27.70 · good poor
Sun 05:00 2.78 · high 9.08 · high 27.70 · good poor
Sun 06:00 2.66 · high 9.06 · high 27.80 · good poor
Sun 07:00 2.58 · high 9.49 · high 27.80 · good poor
Sun 08:00 2.96 · high 10.04 · high 26.60 · good poor
Sun 09:00 2.88 · high 10.03 · high 26.60 · good poor
Sun 10:00 2.82 · high 9.87 · high 26.60 · good poor
Sun 11:00 2.76 · high 9.74 · high 26.50 · good poor
Sun 12:00 2.70 · high 10.00 · high 26.50 · good poor
Sun 13:00 2.66 · high 9.97 · high 26.50 · good poor
Sun 14:00 2.60 · high 10.32 · high 26.50 · good poor
Sun 15:00 2.56 · high 10.67 · high 26.50 · good poor
Sun 16:00 2.50 · high 10.05 · high 26.50 · good poor
Sun 17:00 2.46 · high 9.70 · high 26.50 · good poor
Sun 18:00 2.40 · high 9.63 · high 26.50 · good poor
Sun 19:00 2.34 · high 9.07 · high 26.50 · good poor
Sun 20:00 2.26 · high 8.41 · high 26.50 · good poor
Sun 21:00 2.20 · high 7.97 · high 26.50 · good poor
Sun 22:00 2.16 · high 7.59 · high 26.50 · good poor
Sun 23:00 2.10 · high 7.68 · high 26.50 · good poor
Mon 00:00 2.06 · high 7.75 · high 26.50 · good fair
Mon 01:00 2.02 · high 8.21 · high 26.60 · good poor
Mon 02:00 2.00 · high 8.46 · high 26.60 · good poor
Mon 03:00 1.96 · high 8.53 · high 26.70 · good poor
Mon 04:00 1.94 · high 8.20 · high 26.80 · good poor
Mon 05:00 1.92 · high 8.35 · high 26.80 · good poor
Mon 06:00 1.90 · high 8.46 · high 26.90 · good poor
Mon 07:00 1.88 · high 8.48 · high 26.90 · good poor
Mon 08:00 1.86 · high 7.99 · high 26.90 · good poor
Mon 09:00 1.84 · high 8.11 · high 26.90 · good poor
Mon 10:00 1.80 · high 7.97 · high 26.90 · good poor
Mon 11:00 1.74 · high 7.97 · high 26.90 · good poor
Mon 12:00 1.70 · high 7.70 · high 26.90 · good poor
Mon 13:00 1.68 · high 7.45 · high 26.90 · good poor
Mon 14:00 1.64 · high 7.45 · high 26.90 · good poor
Mon 15:00 1.62 · high 7.28 · high 26.80 · good poor
Mon 16:00 1.60 · high 7.25 · high 26.80 · good poor
Mon 17:00 1.56 · high 7.60 · high 26.80 · good poor
Mon 18:00 1.54 · high 7.49 · high 26.70 · good poor
Mon 19:00 1.50 · high 7.28 · high 26.70 · good poor
Mon 20:00 1.48 · high 7.23 · high 26.70 · good poor
Mon 21:00 1.44 · high 7.65 · high 26.60 · good poor
Mon 22:00 1.42 · high 7.54 · high 26.60 · good poor
Mon 23:00 1.40 · high 7.00 · high 26.60 · good poor
Tue 00:00 1.38 · high 6.86 · high 26.60 · good poor
Tue 01:00 1.34 · high 7.31 · high 26.70 · good poor
Tue 02:00 1.30 · high 6.73 · high 26.70 · good poor
Tue 03:00 1.26 · high 5.85 · high 26.80 · good poor
Tue 04:00 1.24 · high 5.61 · high 26.90 · good poor
Tue 05:00 1.20 · high 5.59 · high 27.00 · good poor
Tue 06:00 1.18 · high 5.23 · good 27.00 · good poor
Tue 07:00 1.18 · high 5.23 · good 27.00 · good poor
Tue 08:00 1.16 · high 4.82 · good 27.00 · good poor
Tue 09:00 1.16 · high 4.50 · good 27.00 · good poor
Tue 10:00 1.16 · high 5.15 · good 26.90 · good poor
Tue 11:00 1.14 · high 5.64 · high 26.90 · good poor
Tue 12:00 1.14 · high 6.02 · high 26.90 · good poor
Tue 13:00 1.16 · high 6.33 · high 26.80 · good poor
Tue 14:00 1.16 · high 6.81 · high 26.80 · good poor
Tue 15:00 1.18 · high 7.45 · high 26.80 · good poor
Tue 16:00 1.18 · high 6.85 · high 26.80 · good poor
Tue 17:00 1.18 · high 6.89 · high 26.70 · good poor
Tue 18:00 1.18 · high 7.21 · high 26.70 · good poor
Tue 19:00 1.18 · high 6.70 · high 26.70 · good poor
Tue 20:00 1.18 · high 7.27 · high 26.70 · good poor
Tue 21:00 1.18 · high 7.61 · high 26.70 · good poor
Tue 22:00 1.18 · high 7.50 · high 26.70 · good poor