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 Wed 23:01

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

No useful morning window is showing yet.

No useful afternoon window is showing yet.

Email me when it is good

Sunrise

05:51

Sunset

19:23

Water

28.9°C

Max air

28.3°C

Sky

Clear

5% cloud

Good window is available today

Next safe window: Thu 00:00–10:00 (30% 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 (37 hours)
  • Tide/current (32 hours)
  • Darkness (22 hours)

Jellyfish drift risk

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

Low · 32/100

Low drift risk now.

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 14:00 – Mon 14:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.35 around Sat 18:00; 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 0.62m to 0.7m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 11.9 to 20.0m/s).

Tides range from 0.05m to 1.59m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
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fair ⚠️ Fair
poor ❌ Limited
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fair ⚠️ Fair
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
Fri 14:00 0.66 · high 11.90 · high 27.90 · good poor
Fri 15:00 0.66 · high 14.40 · high 27.90 · good poor
Fri 16:00 0.66 · high 18.50 · high 27.80 · good poor
Fri 17:00 0.68 · high 20.00 · high 27.80 · good poor
Fri 18:00 0.68 · high 19.60 · high 27.80 · good poor
Fri 19:00 0.68 · high 18.60 · high 27.80 · good poor
Fri 20:00 0.70 · high 17.60 · high 27.70 · good poor
Fri 21:00 0.70 · high 17.70 · high 27.70 · good poor
Fri 22:00 0.70 · high 18.10 · high 27.70 · good poor
Fri 23:00 0.70 · high 17.10 · high 27.70 · good poor
Sat 00:00 0.70 · high 16.20 · high 27.70 · good poor
Sat 01:00 0.70 · high 15.80 · high 27.80 · good poor
Sat 02:00 0.68 · high 15.20 · high 27.90 · good poor
Sat 03:00 0.68 · high 14.10 · high 28.00 · good poor
Sat 04:00 0.68 · high 14.70 · high 28.00 · good poor
Sat 05:00 0.66 · high 16.30 · high 28.10 · good poor
Sat 06:00 0.66 · high 17.10 · high 28.20 · good poor
Sat 07:00 0.66 · high 16.50 · high 28.20 · good poor
Sat 08:00 0.64 · high 16.60 · high 28.20 · good poor
Sat 09:00 0.64 · high 16.30 · high 28.20 · good fair
Sat 10:00 0.64 · high 14.50 · high 28.10 · good poor
Sat 11:00 0.62 · high 14.00 · high 28.10 · good poor
Sat 12:00 0.62 · high 13.90 · high 28.10 · good poor
Sat 13:00 0.62 · high 13.10 · high 28.10 · good poor
Sat 14:00 0.62 · high 13.60 · high 28.00 · good poor
Sat 15:00 0.62 · high 15.60 · high 28.00 · good poor
Sat 16:00 0.62 · high 16.50 · high 28.00 · good poor
Sat 17:00 0.62 · high 17.90 · high 27.90 · good poor
Sat 18:00 0.62 · high 17.70 · high 27.90 · good poor
Sat 19:00 0.62 · high 16.40 · high 27.90 · good poor
Sat 20:00 0.64 · high 15.80 · high 27.90 · good poor
Sat 21:00 0.64 · high 16.30 · high 27.90 · good poor
Sat 22:00 0.64 · high 17.90 · high 27.80 · good poor
Sat 23:00 0.64 · high 18.70 · high 27.80 · good poor
Sun 00:00 0.64 · high 18.10 · high 27.90 · good poor
Sun 01:00 0.64 · high 18.20 · high 27.90 · good poor
Sun 02:00 0.64 · high 18.10 · high 28.00 · good poor
Sun 03:00 0.64 · high 17.60 · high 28.20 · good poor
Sun 04:00 0.64 · high 17.80 · high 28.30 · good poor
Sun 05:00 0.64 · high 17.90 · high 28.40 · good poor
Sun 06:00 0.64 · high 16.80 · high 28.40 · good poor
Sun 07:00 0.64 · high 15.60 · high 28.40 · good poor
Sun 08:00 0.66 · high 13.50 · high 28.40 · good poor
Sun 09:00 0.66 · high 12.30 · high 28.40 · good poor
Sun 10:00 0.66 · high 11.60 · high 28.30 · good poor
Sun 11:00 0.64 · high 12.20 · high 28.30 · good poor
Sun 12:00 0.64 · high 13.80 · high 28.20 · good poor
Sun 13:00 0.64 · high 14.60 · high 28.20 · good poor
Sun 14:00 0.62 · high 15.70 · high 28.20 · good poor
Sun 15:00 0.62 · high 16.70 · high 28.10 · good poor
Sun 16:00 0.62 · high 16.90 · high 28.10 · good poor
Sun 17:00 0.64 · high 17.70 · high 28.10 · good poor
Sun 18:00 0.64 · high 18.90 · high 28.10 · good poor
Sun 19:00 0.64 · high 18.10 · high 28.00 · good poor
Sun 20:00 0.64 · high 17.00 · high 28.00 · good poor
Sun 21:00 0.64 · high 16.70 · high 28.00 · good poor
Sun 22:00 0.64 · high 16.40 · high 28.00 · good poor
Sun 23:00 0.62 · high 16.70 · high 28.00 · good poor
Mon 00:00 0.62 · high 16.80 · high 28.00 · good poor
Mon 01:00 0.62 · high 17.10 · high 28.00 · good poor
Mon 02:00 0.64 · high 16.90 · high 28.20 · good poor
Mon 03:00 0.64 · high 17.90 · high 28.30 · good poor
Mon 04:00 0.64 · high 17.30 · high 28.40 · good poor
Mon 05:00 0.66 · high 16.90 · high 28.50 · good poor
Mon 06:00 0.66 · high 16.20 · high 28.60 · good poor
Mon 07:00 0.66 · high 15.30 · high 28.60 · good poor
Mon 08:00 0.66 · high 14.50 · high 28.60 · good poor
Mon 09:00 0.66 · high 12.90 · high 28.50 · good poor
Mon 10:00 0.74 · high 1.87 · good 28.50 · good fair
Mon 11:00 0.74 · high 1.27 · good 28.50 · good poor
Mon 12:00 0.76 · high 0.92 · good 28.50 · good poor
Mon 13:00 0.76 · high 0.89 · good 28.50 · good poor