MARINE REPORT / 72 HOURS

Kerama Islands Snorkel Report Today

Japan · Updated Mon 02:54 (JST) · Source: Snapshot

The skinny

Marginal Data updated Mon 02:54 (JST)

Kerama Islands looks marginal today. The least-bad daylight window is around Mon 12:00, but waves is limiting the forecast.

Right now (forecast)

Poor · 0.0/10

Mon 05:00 (JST)

Later today

Fair · 4.3/10

Mon 12:00 (JST)

Next three days

Fair · 4.3/10

Mon 12:00 (JST)

Model estimates using Open-Meteo; not observations or safety guarantees. Check official advisories and conditions at the beach.

Score: 4.3/10

Best time: Mon 12:00

Main risk: Waves

Best morning signal: Mon 10:00 (Fair).

Best afternoon signal: Mon 12:00 (Fair). Peak afternoon wind is about 6.0 m/s.

Email me when it is good

Sunrise

06:31

Sunset

18:00

Water

27.9°C

Max air

27.2°C

Sky

Partly cloudy

33% cloud

No good model window in the next 72 hours

Use the best-available section for the least-bad times.

3-day planner Best available Show data

3-day planner

Monday

⚠️ Fair conditions

Main blocker: Waves

Tuesday

⚠️ Fair conditions

Main blocker: Waves

Wednesday

❌ Poor conditions

Main blocker: Waves

Best available hours

  • Mon 12:00: Fair (0.43) · still limited by waves, tide/current
  • Mon 17:00: Fair (0.42) · still limited by waves, wind
  • Mon 10:00: Fair (0.42) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

  • Waves (68 hours)
  • Tide/current (59 hours)
  • Wind (52 hours)

Jellyfish drift risk

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

Low · 34/100

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.

Upcoming high tides

Tue 15:00, Wed 16:00

Nearby alternatives in Japan

Okinawa - Blue Cave

56 km away

✅ Good

Miyako

257 km away

❌ Poor

Ishigaki

381 km away

❌ Poor

Advanced forecast data

Viewing historical data

Wed 05:00 – Sat 05:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.55 around Wed 17:00; 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 0.56m to 0.66m).

Wind is at or below 5.4m/s in 24/24 sampled hours (range 1.2 to 5.1m/s).

Tides range from 0.23m to 1.54m; 1 of 24 hours are in or near peak slack windows.

72-hour historical overview
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
Good 🌟 Good
Good 🌟 Good
Fair ⚠️ Fair
Fair ⚠️ Fair
Good 🌟 Good
Fair ⚠️ Fair
Fair ⚠️ Fair
Good 🌟 Good
Good 🌟 Good
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
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
Good 🌟 Good
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 is better in daylight, so night hours score lower.
Detailed hourly data table
Time Wave (m) Wind (m/s) Sea temp (°C) Status
Wed 05:00 0.66 · high 1.25 · good 28.90 · good Poor
Wed 06:00 0.66 · high 1.37 · good 28.90 · good Poor
Wed 07:00 0.66 · high 1.42 · good 28.80 · good Poor
Wed 08:00 0.64 · high 1.57 · good 28.90 · good Poor
Wed 09:00 0.64 · high 1.79 · good 28.90 · good Fair
Wed 10:00 0.64 · high 2.26 · good 28.90 · good Fair
Wed 11:00 0.62 · high 2.32 · good 29.00 · good Fair
Wed 12:00 0.62 · high 2.46 · good 29.10 · good Fair
Wed 13:00 0.60 · high 1.99 · good 29.20 · good Fair
Wed 14:00 0.60 · high 1.20 · good 29.30 · good Fair
Wed 15:00 0.58 · high 2.27 · good 29.40 · good Fair
Wed 16:00 0.58 · high 2.50 · good 29.40 · good Fair
Wed 17:00 0.56 · high 2.78 · good 29.30 · good Fair
Wed 18:00 0.56 · high 3.12 · good 29.30 · good Fair
Wed 19:00 0.56 · high 3.64 · good 29.20 · good Poor
Wed 20:00 0.56 · high 4.67 · good 29.10 · good Poor
Wed 21:00 0.56 · high 5.10 · good 29.10 · good Poor
Wed 22:00 0.56 · high 4.16 · good 29.00 · good Poor
Wed 23:00 0.58 · high 3.31 · good 29.00 · good Poor
Thu 00:00 0.58 · high 2.65 · good 29.00 · good Poor
Thu 01:00 0.58 · high 3.86 · good 29.00 · good Poor
Thu 02:00 0.56 · high 4.50 · good 29.00 · good Poor
Thu 03:00 0.56 · high 4.28 · good 29.00 · good Poor
Thu 04:00 0.56 · high 3.97 · good 29.00 · good Poor
Thu 05:00 0.54 · high 3.75 · good 28.90 · good Poor
Thu 06:00 0.54 · high 3.67 · good 28.90 · good Poor
Thu 07:00 0.54 · high 4.05 · good 28.90 · good Poor
Thu 08:00 0.52 · high 3.38 · good 28.90 · good Poor
Thu 09:00 0.52 · high 3.69 · good 28.90 · good Good
Thu 10:00 0.52 · high 4.44 · good 29.00 · good Good
Thu 11:00 0.52 · high 4.16 · good 29.10 · good Fair
Thu 12:00 0.52 · high 4.46 · good 29.20 · good Fair
Thu 13:00 0.52 · high 4.90 · good 29.40 · good Good
Thu 14:00 0.50 · high 4.63 · good 29.50 · good Fair
Thu 15:00 0.50 · high 4.10 · good 29.50 · good Fair
Thu 16:00 0.50 · high 3.45 · good 29.50 · good Good
Thu 17:00 0.48 · high 2.65 · good 29.50 · good Good
Thu 18:00 0.48 · high 3.43 · good 29.40 · good Fair
Thu 19:00 0.48 · high 4.76 · good 29.30 · good Poor
Thu 20:00 0.50 · high 5.07 · good 29.20 · good Poor
Thu 21:00 0.50 · high 5.30 · good 29.20 · good Poor
Thu 22:00 0.50 · high 5.27 · good 29.10 · good Poor
Thu 23:00 0.48 · high 5.15 · good 29.10 · good Poor
Fri 00:00 0.48 · high 4.50 · good 29.10 · good Poor
Fri 01:00 0.44 · high 2.84 · good 29.10 · good Poor
Fri 02:00 0.44 · high 2.39 · good 29.00 · good Poor
Fri 03:00 0.42 · high 1.68 · good 29.00 · good Poor
Fri 04:00 0.42 · high 1.52 · good 29.00 · good Poor
Fri 05:00 0.40 · high 1.19 · good 29.00 · good Poor
Fri 06:00 0.40 · high 0.94 · good 29.00 · good Poor
Fri 07:00 0.40 · high 2.14 · good 28.90 · good Poor
Fri 08:00 0.38 · high 2.98 · good 28.90 · good Poor
Fri 09:00 0.38 · high 3.14 · good 29.00 · good Good
Fri 10:00 0.38 · high 3.06 · good 29.00 · good Good
Fri 11:00 0.36 · good 2.48 · good 29.20 · good Good
Fri 12:00 0.36 · good 1.83 · good 29.30 · good Good
Fri 13:00 0.36 · good 1.81 · good 29.40 · good Good
Fri 14:00 0.36 · good 1.84 · good 29.50 · good Good
Fri 15:00 0.36 · good 3.57 · good 29.60 · good Good
Fri 16:00 0.36 · good 3.06 · good 29.60 · good Good
Fri 17:00 0.36 · good 3.24 · good 29.50 · good Good
Fri 18:00 0.36 · good 4.00 · good 29.40 · good Good
Fri 19:00 0.36 · good 3.93 · good 29.40 · good Poor
Fri 20:00 0.44 · high 3.30 · good 29.30 · good Poor
Fri 21:00 0.46 · high 3.30 · good 29.30 · good Poor
Fri 22:00 0.50 · high 3.31 · good 29.20 · good Poor
Fri 23:00 0.52 · high 3.53 · good 29.20 · good Poor
Sat 00:00 0.56 · high 3.17 · good 29.20 · good Poor
Sat 01:00 0.60 · high 3.07 · good 29.20 · good Poor
Sat 02:00 0.62 · high 3.10 · good 29.10 · good Poor
Sat 03:00 0.66 · high 3.13 · good 29.10 · good Poor
Sat 04:00 0.70 · high 3.94 · good 29.10 · good Poor