SnorkelForecast.com

Kerama Islands Snorkel Report Today

Japan · Updated Wed 02:13 (JST) · Source: Snapshot

The skinny

Marginal Report Wed 11:42

Kerama Islands looks marginal today. The least-bad daylight window is around Sat 10:00, but waves is limiting the forecast.

Score: 3.7/10

Best time: Sat 10:00

Main risk: Waves

No useful morning window is showing yet.

Best afternoon signal: Wed 16:00 (Fair). Peak afternoon wind is about 7.0 m/s.

Email me when it is good

Sunrise

06:11

Sunset

18:50

Water

28.6°C

Max air

28.0°C

Sky

Cloudy

99% 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

Wednesday

⚠️ Fair conditions

Main blocker: Waves

Thursday

❌ Poor conditions

Main blocker: Waves

Friday

⚠️ Fair conditions

Main blocker: Waves

Best available hours

  • Sat 01:00: Fair (0.47) · still limited by waves, tide/current
  • Sat 00:00: Fair (0.47) · still limited by waves, tide/current
  • Wed 07:00: Fair (0.37) · still limited by waves, wind

Why this verdict

Main blockers across the next 72 hours:

  • Waves (71 hours)
  • Tide/current (64 hours)
  • Wind (50 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

Wed 12:00, Thu 13:00, Fri 03:00, Fri 14:00

Nearby alternatives in Japan

Okinawa - Blue Cave

56 km away

❌ Poor

Miyako

257 km away

❌ Poor

Ishigaki

381 km away

❌ Poor

Advanced forecast data

Viewing current forecast

Wed 02:00 – Sat 02:00 (JST)

Previous day Yesterday

Snorkel Score (next 24h)

Best snorkel score is 0.37 around Wed 16:00; 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 1.64m to 1.88m).

Wind is at or below 5.4m/s in 4/24 sampled hours (range 4.9 to 10.27m/s).

Tides range from 0.37m to 1.89m; 1 of 24 hours are in or near peak slack windows.

72-hour forecast overview
Poor ❌ Limited
Poor ❌ Limited
Poor ❌ Limited
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Fair ⚠️ Fair
Poor ❌ Limited
Poor ❌ Limited
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Fair ⚠️ Fair
Poor ❌ Limited
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Fair ⚠️ Fair
Fair ⚠️ Fair
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 03:00 1.72 · high 6.84 · high 28.60 · good Poor
Wed 04:00 1.70 · high 6.84 · high 28.60 · good Poor
Wed 05:00 1.66 · high 6.26 · high 28.60 · good Poor
Wed 06:00 1.64 · high 6.78 · high 28.60 · good Poor
Wed 07:00 1.64 · high 6.56 · high 28.60 · good Fair
Wed 08:00 1.66 · high 7.01 · high 28.60 · good Poor
Wed 09:00 1.66 · high 6.74 · high 28.60 · good Poor
Wed 10:00 1.70 · high 6.31 · high 28.60 · good Poor
Wed 11:00 1.72 · high 7.89 · high 28.60 · good Poor
Wed 12:00 1.76 · high 7.75 · high 28.60 · good Poor
Wed 13:00 1.80 · high 10.27 · high 28.60 · good Poor
Wed 14:00 1.84 · high 9.90 · high 28.60 · good Poor
Wed 15:00 1.88 · high 8.93 · high 28.60 · good Poor
Wed 16:00 1.84 · high 8.87 · high 28.60 · good Poor
Wed 17:00 1.82 · high 8.39 · high 28.60 · good Poor
Wed 18:00 1.78 · high 8.55 · high 28.60 · good Poor
Wed 19:00 1.76 · high 8.03 · high 28.60 · good Poor
Wed 20:00 1.72 · high 6.69 · high 28.60 · good Poor
Wed 21:00 1.70 · high 5.65 · high 28.60 · good Poor
Wed 22:00 1.68 · high 5.45 · high 28.60 · good Poor
Wed 23:00 1.66 · high 4.93 · good 28.60 · good Poor
Thu 00:00 1.64 · high 4.90 · good 28.60 · good Poor
Thu 01:00 1.64 · high 5.06 · good 28.70 · good Poor
Thu 02:00 1.64 · high 5.34 · good 28.70 · good Poor
Thu 03:00 1.64 · high 6.72 · high 28.80 · good Poor
Thu 04:00 1.64 · high 6.88 · high 28.90 · good Poor
Thu 05:00 1.62 · high 7.07 · high 28.90 · good Poor
Thu 06:00 1.62 · high 6.27 · high 29.00 · good Poor
Thu 07:00 1.60 · high 6.44 · high 29.00 · good Poor
Thu 08:00 1.60 · high 7.07 · high 28.90 · good Poor
Thu 09:00 1.58 · high 6.98 · high 28.90 · good Poor
Thu 10:00 1.60 · high 6.26 · high 28.90 · good Poor
Thu 11:00 1.62 · high 6.98 · high 28.80 · good Poor
Thu 12:00 1.64 · high 8.20 · high 28.80 · good Poor
Thu 13:00 1.66 · high 8.86 · high 28.80 · good Poor
Thu 14:00 1.66 · high 8.70 · high 28.70 · good Poor
Thu 15:00 1.68 · high 9.30 · high 28.70 · good Poor
Thu 16:00 1.68 · high 8.35 · high 28.70 · good Poor
Thu 17:00 1.66 · high 7.64 · high 28.70 · good Poor
Thu 18:00 1.66 · high 7.23 · high 28.70 · good Poor
Thu 19:00 1.66 · high 5.79 · high 28.70 · good Poor
Thu 20:00 1.66 · high 4.92 · good 28.70 · good Poor
Thu 21:00 1.66 · high 4.87 · good 28.70 · good Poor
Thu 22:00 1.66 · high 6.75 · high 28.70 · good Poor
Thu 23:00 1.64 · high 8.36 · high 28.70 · good Poor
Fri 00:00 1.64 · high 7.31 · high 28.70 · good Poor
Fri 01:00 1.64 · high 6.67 · high 28.70 · good Poor
Fri 02:00 1.62 · high 5.81 · high 28.70 · good Poor
Fri 03:00 1.62 · high 5.70 · high 28.80 · good Poor
Fri 04:00 1.60 · high 6.60 · high 28.90 · good Poor
Fri 05:00 1.60 · high 6.10 · high 28.90 · good Poor
Fri 06:00 1.58 · high 5.89 · high 28.90 · good Fair
Fri 07:00 1.58 · high 5.47 · high 28.90 · good Poor
Fri 08:00 1.58 · high 5.20 · good 28.90 · good Poor
Fri 09:00 1.58 · high 5.37 · good 28.90 · good Poor
Fri 10:00 1.58 · high 5.20 · good 28.90 · good Poor
Fri 11:00 1.58 · high 5.37 · good 28.80 · good Poor
Fri 12:00 1.58 · high 6.10 · high 28.80 · good Poor
Fri 13:00 1.58 · high 6.36 · high 28.80 · good Poor
Fri 14:00 1.58 · high 5.46 · high 28.80 · good Poor
Fri 15:00 1.58 · high 4.65 · good 28.80 · good Poor
Fri 16:00 1.58 · high 4.49 · good 28.80 · good Poor
Fri 17:00 1.60 · high 4.90 · good 28.70 · good Poor
Fri 18:00 1.60 · high 4.99 · good 28.70 · good Poor
Fri 19:00 1.60 · high 4.47 · good 28.70 · good Poor
Fri 20:00 1.58 · high 3.50 · good 28.70 · good Poor
Fri 21:00 1.58 · high 3.50 · good 28.70 · good Poor
Fri 22:00 1.58 · high 3.57 · good 28.70 · good Poor
Fri 23:00 1.58 · high 4.00 · good 28.70 · good Poor
Sat 00:00 1.58 · high 4.75 · good 28.70 · good Fair
Sat 01:00 1.58 · high 5.26 · good 28.80 · good Fair