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 16:22

Kerama Islands has a usable snorkeling window around Wed 17:00. The main thing to watch is waves.

Score: 7.0/10

Best time: Wed 17:00

Main risk: Waves

No useful morning window is showing yet.

Best afternoon signal: Wed 17:00 (Good). Peak afternoon wind is about 1.1 m/s.

Email me when it is good

Sunrise

05:51

Sunset

19:23

Water

29.4°C

Max air

28.1°C

Sky

Clear

12% cloud

Good window is available today

Next safe window: Wed 08:00–10:00 (32% 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 08:00 until 10:00.

Why this verdict

Main blockers across the next 72 hours:

  • Waves (44 hours)
  • Tide/current (39 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.

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

Tue 07:00 – Fri 07:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.5 around Tue 16:00; 11 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 0.8m to 2.02m).

Wind is at or below 5.4m/s in 19/24 sampled hours (range 1.62 to 7.84m/s).

Tides range from 0.48m to 1.57m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
fair ⚠️ Fair
fair ⚠️ Fair
fair ⚠️ Fair
fair ⚠️ Fair
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
fair ⚠️ Fair
fair ⚠️ Fair
fair ⚠️ Fair
fair ⚠️ Fair
fair ⚠️ Fair
fair ⚠️ Fair
fair ⚠️ Fair
fair ⚠️ Fair
fair ⚠️ Fair
fair ⚠️ Fair
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
poor ❌ Limited
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
Tue 07:00 0.80 · high 1.62 · good 29.10 · good fair
Tue 08:00 0.80 · high 2.07 · good 29.10 · good fair
Tue 09:00 0.80 · high 2.63 · good 29.00 · good fair
Tue 10:00 0.82 · high 3.80 · good 28.90 · good fair
Tue 11:00 0.82 · high 4.87 · good 28.80 · good poor
Tue 12:00 0.84 · high 4.39 · good 28.70 · good poor
Tue 13:00 0.88 · high 3.81 · good 28.70 · good poor
Tue 14:00 0.90 · high 3.63 · good 28.60 · good poor
Tue 15:00 0.94 · high 4.26 · good 28.60 · good poor
Tue 16:00 0.98 · high 4.63 · good 28.50 · good poor
Tue 17:00 1.02 · high 4.51 · good 28.50 · good poor
Tue 18:00 1.06 · high 4.65 · good 28.40 · good poor
Tue 19:00 1.12 · high 4.77 · good 28.40 · good poor
Tue 20:00 1.18 · high 4.74 · good 28.40 · good poor
Tue 21:00 1.24 · high 4.55 · good 28.40 · good poor
Tue 22:00 1.32 · high 4.91 · good 28.40 · good poor
Tue 23:00 1.38 · high 4.81 · good 28.40 · good poor
Wed 00:00 1.46 · high 4.81 · good 28.40 · good fair
Wed 01:00 1.56 · high 5.09 · good 28.40 · good fair
Wed 02:00 1.66 · high 5.71 · high 28.50 · good fair
Wed 03:00 1.76 · high 6.21 · high 28.60 · good fair
Wed 04:00 1.84 · high 6.60 · high 28.60 · good fair
Wed 05:00 1.94 · high 6.91 · high 28.70 · good fair
Wed 06:00 2.02 · high 7.84 · high 28.70 · good fair
Wed 07:00 2.10 · high 8.54 · high 28.70 · good fair
Wed 08:00 2.20 · high 8.47 · high 28.70 · good fair
Wed 09:00 2.28 · high 7.96 · high 28.70 · good fair
Wed 10:00 2.36 · high 7.44 · high 28.60 · good poor
Wed 11:00 2.46 · high 7.39 · high 28.60 · good poor
Wed 12:00 2.54 · high 7.95 · high 28.60 · good poor
Wed 13:00 2.60 · high 8.48 · high 28.50 · good poor
Wed 14:00 2.68 · high 8.43 · high 28.50 · good poor
Wed 15:00 2.74 · high 7.79 · high 28.50 · good poor
Wed 16:00 2.82 · high 7.43 · high 28.50 · good poor
Wed 17:00 2.88 · high 7.91 · high 28.40 · good poor
Wed 18:00 2.96 · high 8.31 · high 28.40 · good poor
Wed 19:00 3.00 · high 8.56 · high 28.40 · good poor
Wed 20:00 3.06 · high 8.42 · high 28.40 · good poor
Wed 21:00 3.10 · high 8.38 · high 28.50 · good poor
Wed 22:00 3.18 · high 8.48 · high 28.50 · good poor
Wed 23:00 3.24 · high 8.50 · high 28.50 · good poor
Thu 00:00 3.32 · high 8.38 · high 28.60 · good poor
Thu 01:00 3.40 · high 8.73 · high 28.60 · good poor
Thu 02:00 3.48 · high 8.48 · high 28.70 · good poor
Thu 03:00 3.56 · high 9.28 · high 28.80 · good poor
Thu 04:00 3.62 · high 9.49 · high 28.90 · good poor
Thu 05:00 3.70 · high 9.80 · high 29.00 · good poor
Thu 06:00 3.76 · high 9.95 · high 29.00 · good poor
Thu 07:00 3.84 · high 10.41 · high 29.10 · good poor
Thu 08:00 3.92 · high 11.01 · high 29.10 · good poor
Thu 09:00 3.30 · high 11.06 · high 29.20 · good poor
Thu 10:00 3.40 · high 11.32 · high 29.20 · good poor
Thu 11:00 3.52 · high 10.42 · high 29.20 · good poor
Thu 12:00 3.62 · high 12.50 · high 29.20 · good poor
Thu 13:00 3.70 · high 11.47 · high 29.20 · good poor
Thu 14:00 3.76 · high 12.30 · high 29.20 · good poor
Thu 15:00 3.84 · high 12.02 · high 29.20 · good poor
Thu 16:00 3.96 · high 10.93 · high 29.20 · good poor
Thu 17:00 4.08 · high 11.48 · high 29.10 · good poor
Thu 18:00 4.20 · high 12.24 · high 29.10 · good poor
Thu 19:00 4.40 · high 13.10 · high 29.10 · good poor
Thu 20:00 4.60 · high 13.25 · high 29.10 · good poor
Thu 21:00 4.80 · high 13.57 · high 29.10 · good poor
Thu 22:00 5.00 · high 14.88 · high 29.00 · good poor
Thu 23:00 5.20 · high 13.69 · high 29.00 · good poor
Fri 00:00 5.40 · high 15.12 · high 29.00 · good poor
Fri 01:00 5.60 · high 15.09 · high 28.90 · good poor
Fri 02:00 5.80 · high 14.87 · high 28.90 · good poor
Fri 03:00 6.00 · high 16.56 · high 28.80 · good poor
Fri 04:00 6.10 · high 18.66 · high 28.70 · good poor
Fri 05:00 6.22 · high 20.10 · high 28.70 · good poor
Fri 06:00 6.32 · high 17.87 · high 28.60 · good poor