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 18:09

Kerama Islands has a usable snorkeling window around Wed 19:00. The main thing to watch is waves.

Score: 7.0/10

Best time: Wed 19:00

Main risk: Waves

No useful morning window is showing yet.

Best afternoon signal: Wed 19:00 (Good). Peak afternoon wind is about 1.0 m/s.

Email me when it is good

Sunrise

05:51

Sunset

19:23

Water

29.2°C

Max air

28.1°C

Sky

Clear

17% cloud

Good window is available today

Next safe window: Wed 10:00 (29% 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 10:00.

Why this verdict

Main blockers across the next 72 hours:

  • Waves (42 hours)
  • Tide/current (37 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

Mon 09:00 – Thu 09:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.52 around Tue 11:00; 10 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 0.66m to 0.8m).

Wind is at or below 5.4m/s in 23/24 sampled hours (range 0.55 to 12.9m/s).

Tides range from 0.47m to 1.55m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview
poor ❌ Limited
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
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
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
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
Mon 14:00 0.78 · high 1.31 · good 28.40 · good poor
Mon 15:00 0.78 · high 1.73 · good 28.40 · good poor
Mon 16:00 0.78 · high 1.87 · good 28.40 · good poor
Mon 17:00 0.78 · high 1.88 · good 28.40 · good poor
Mon 18:00 0.78 · high 1.55 · good 28.40 · good poor
Mon 19:00 0.78 · high 1.12 · good 28.40 · good poor
Mon 20:00 0.78 · high 0.87 · good 28.30 · good poor
Mon 21:00 0.78 · high 1.36 · good 28.30 · good poor
Mon 22:00 0.78 · high 1.50 · good 28.30 · good poor
Mon 23:00 0.78 · high 1.95 · good 28.30 · good poor
Tue 00:00 0.78 · high 2.04 · good 28.40 · good fair
Tue 01:00 0.78 · high 1.19 · good 28.50 · good fair
Tue 02:00 0.78 · high 0.55 · good 28.60 · good fair
Tue 03:00 0.78 · high 0.74 · good 28.80 · good fair
Tue 04:00 0.78 · high 0.94 · good 28.90 · good fair
Tue 05:00 0.80 · high 1.36 · good 29.10 · good fair
Tue 06:00 0.80 · high 1.86 · good 29.10 · good fair
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