Can you snorkel in Kerama Islands today?

Conditions look marginal right now — no clearly safe snorkeling window is forecast in Kerama Islands over the next 72 hours. Check the hourly table for the calmest period.

What is the best time of day to snorkel in Kerama Islands?

Snorkel during daylight, ideally in the morning before the wind picks up, and around high slack tide when water is clearest and currents are weakest. SnorkelForecast scores every daylight hour in Kerama Islands so you can pick the calmest window.

What is the best tide for snorkeling?

High slack tide — within about an hour of the high-tide peak when currents are weakest — is the safest, clearest window. Strong low tides, strong tidal flow near channels or headlands, and large tidal-range days reduce score.

Kerama Islands Snorkel Report Today

Japan · Updated Sat 05:03 (JST) · Source: Snapshot · Showing fallback/stale data

The skinny

Marginal Report Sun 15:28

Kerama Islands looks marginal today. The least-bad daylight window is around Sun 18:00, but waves is limiting the forecast.

Score: 5.4/10

Best time: Sun 18:00

Main risk: Waves

No useful morning window is showing yet.

Best afternoon signal: Sun 18:00 (Fair). Peak afternoon wind is about 2.9 m/s.

Email me when it is good

Sunrise

05:49

Sunset

19:24

Water

28.8°C

Max air

28.0°C

Sky

Clear

6% cloud

No safe 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

Sunday

⚠️ fair conditions

Main blocker: Waves

Monday

⚠️ fair conditions

Main blocker: Waves

Tuesday

⚠️ fair conditions

Main blocker: Waves

Best available hours

Sun 09:00 — Fair (0.54) · still limited by waves
Sun 10:00 — Fair (0.53) · still limited by waves, tide/current
Tue 00:00 — Fair (0.52) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

Waves (46 hours)
Tide/current (44 hours)
Darkness (26 hours)

Jellyfish drift risk

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

Low · 34/100

Low peak drift risk around Sun 20:00.

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.

Upcoming high tides

Sun 13:00, Mon 14:00, Tue 02:00

Nearby alternatives in Japan

Okinawa - Blue Cave

56 km away

✅ Good

Miyako

257 km away

⚠️ Fair

Ishigaki

381 km away

⚠️ Fair

Advanced forecast data

Viewing historical data

Fri 06:00 – Mon 06:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.36 around Sat 12:00; 2 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 1.1m to 1.16m).

Wind is at or below 5.4m/s in 7/24 sampled hours (range 5.13 to 6.92m/s).

Tides range from 0.01m to 1.94m; 2 of 24 hours are in or near peak slack windows.

72-hour historical overview

Fri 06:00 poor ❌ Limited

Fri 07:00 poor ❌ Limited

Fri 08:00 poor ❌ Limited

Fri 09:00 poor ❌ Limited

Fri 10:00 poor ❌ Limited

Fri 11:00 poor ❌ Limited

Fri 12:00 poor ❌ Limited

Fri 13:00 poor ❌ Limited

Fri 14:00 poor ❌ Limited

Fri 15:00 poor ❌ Limited

Fri 16:00 poor ❌ Limited

Fri 17:00 poor ❌ Limited

Fri 18:00 poor ❌ Limited

Fri 19:00 poor ❌ Limited

Fri 20:00 poor ❌ Limited

Fri 21:00 poor ❌ Limited

Fri 22:00 poor ❌ Limited

Fri 23:00 poor ❌ Limited

Sat 00:00 poor ❌ Limited

Sat 01:00 fair ⚠️ Fair

Sat 02:00 poor ❌ Limited

Sat 03:00 fair ⚠️ Fair

Sat 04:00 poor ❌ Limited

Sat 05:00 poor ❌ Limited

Sat 06:00 fair ⚠️ Fair

Sat 07:00 fair ⚠️ Fair

Sat 08:00 fair ⚠️ Fair

Sat 09:00 fair ⚠️ Fair

Sat 10:00 fair ⚠️ Fair

Sat 11:00 poor ❌ Limited

Sat 12:00 poor ❌ Limited

Sat 13:00 poor ❌ Limited

Sat 14:00 poor ❌ Limited

Sat 15:00 poor ❌ Limited

Sat 16:00 poor ❌ Limited

Sat 17:00 poor ❌ Limited

Sat 18:00 poor ❌ Limited

Sat 19:00 poor ❌ Limited

Sat 20:00 poor ❌ Limited

Sat 21:00 poor ❌ Limited

Sat 22:00 poor ❌ Limited

Sat 23:00 poor ❌ Limited

Sun 00:00 fair ⚠️ Fair

Sun 01:00 fair ⚠️ Fair

Sun 02:00 fair ⚠️ Fair

Sun 03:00 fair ⚠️ Fair

Sun 04:00 fair ⚠️ Fair

Sun 05:00 fair ⚠️ Fair

Sun 06:00 fair ⚠️ Fair

Sun 07:00 fair ⚠️ Fair

Sun 08:00 fair ⚠️ Fair

Sun 09:00 fair ⚠️ Fair

Sun 10:00 fair ⚠️ Fair

Sun 11:00 poor ❌ Limited

Sun 12:00 poor ❌ Limited

Sun 13:00 poor ❌ Limited

Sun 14:00 poor ❌ Limited

Sun 15:00 poor ❌ Limited

Sun 16:00 poor ❌ Limited

Sun 17:00 poor ❌ Limited

Sun 18:00 poor ❌ Limited

Sun 19:00 poor ❌ Limited

Sun 20:00 poor ❌ Limited

Sun 21:00 poor ❌ Limited

Sun 22:00 poor ❌ Limited

Sun 23:00 poor ❌ Limited

Mon 00:00 fair ⚠️ Fair

Mon 01:00 fair ⚠️ Fair

Mon 02:00 fair ⚠️ Fair

Mon 03:00 fair ⚠️ Fair

Mon 04:00 fair ⚠️ Fair

Mon 05:00 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 and safety gate (outside daylight scores lower).

Detailed hourly data table

Time	Wave (m)	Wind (m/s)	Sea temp (°C)	Status
Fri 06:00	1.12 · high	6.91 · high	27.50 · good	poor
Fri 07:00	1.12 · high	6.92 · high	27.50 · good	poor
Fri 08:00	1.14 · high	6.91 · high	27.50 · good	poor
Fri 09:00	1.14 · high	6.89 · high	27.50 · good	poor
Fri 10:00	1.12 · high	6.14 · high	27.50 · good	poor
Fri 11:00	1.12 · high	5.63 · high	27.50 · good	poor
Fri 12:00	1.10 · high	5.24 · good	27.50 · good	poor
Fri 13:00	1.10 · high	5.13 · good	27.50 · good	poor
Fri 14:00	1.10 · high	5.21 · good	27.40 · good	poor
Fri 15:00	1.10 · high	5.84 · high	27.40 · good	poor
Fri 16:00	1.12 · high	6.83 · high	27.40 · good	poor
Fri 17:00	1.12 · high	6.65 · high	27.30 · good	poor
Fri 18:00	1.14 · high	5.90 · high	27.30 · good	poor
Fri 19:00	1.14 · high	6.20 · high	27.30 · good	poor
Fri 20:00	1.14 · high	5.94 · high	27.30 · good	poor
Fri 21:00	1.14 · high	6.05 · high	27.30 · good	poor
Fri 22:00	1.14 · high	5.89 · high	27.30 · good	poor
Fri 23:00	1.14 · high	5.27 · good	27.30 · good	poor
Sat 00:00	1.14 · high	5.42 · high	27.30 · good	poor
Sat 01:00	1.14 · high	5.15 · good	27.40 · good	fair
Sat 02:00	1.16 · high	5.99 · high	27.40 · good	poor
Sat 03:00	1.16 · high	5.31 · good	27.50 · good	fair
Sat 04:00	1.16 · high	5.33 · good	27.50 · good	poor
Sat 05:00	1.16 · high	5.80 · high	27.60 · good	poor
Sat 06:00	0.98 · high	6.47 · high	28.20 · good	fair
Sat 07:00	0.98 · high	6.01 · high	28.20 · good	fair
Sat 08:00	0.96 · high	5.76 · high	28.20 · good	fair
Sat 09:00	0.96 · high	5.14 · good	28.20 · good	fair
Sat 10:00	0.96 · high	4.92 · good	28.10 · good	fair
Sat 11:00	0.96 · high	4.98 · good	28.10 · good	poor
Sat 12:00	0.96 · high	4.97 · good	28.10 · good	poor
Sat 13:00	0.98 · high	4.83 · good	28.10 · good	poor
Sat 14:00	1.00 · high	5.06 · good	28.00 · good	poor
Sat 15:00	1.02 · high	5.16 · good	28.00 · good	poor
Sat 16:00	1.04 · high	4.82 · good	28.00 · good	poor
Sat 17:00	1.06 · high	4.34 · good	27.90 · good	poor
Sat 18:00	1.08 · high	3.99 · good	27.90 · good	poor
Sat 19:00	1.08 · high	3.20 · good	27.90 · good	poor
Sat 20:00	1.10 · high	2.82 · good	27.90 · good	poor
Sat 21:00	1.10 · high	2.31 · good	27.90 · good	poor
Sat 22:00	1.10 · high	1.66 · good	27.90 · good	poor
Sat 23:00	1.10 · high	1.31 · good	27.90 · good	poor
Sun 00:00	1.10 · high	1.21 · good	28.00 · good	fair
Sun 01:00	1.10 · high	1.42 · good	28.10 · good	fair
Sun 02:00	1.08 · high	1.61 · good	28.20 · good	fair
Sun 03:00	1.08 · high	1.66 · good	28.40 · good	fair
Sun 04:00	1.08 · high	1.63 · good	28.60 · good	fair
Sun 05:00	1.06 · high	2.23 · good	28.70 · good	fair
Sun 06:00	1.06 · high	2.62 · good	28.80 · good	fair
Sun 07:00	1.04 · high	2.52 · good	28.80 · good	fair
Sun 08:00	1.04 · high	2.51 · good	28.80 · good	fair
Sun 09:00	1.02 · high	2.60 · good	28.70 · good	fair
Sun 10:00	1.00 · high	2.85 · good	28.60 · good	fair
Sun 11:00	1.00 · high	3.01 · good	28.50 · good	poor
Sun 12:00	0.98 · high	3.28 · good	28.40 · good	poor
Sun 13:00	0.96 · high	3.31 · good	28.40 · good	poor
Sun 14:00	0.96 · high	3.22 · good	28.30 · good	poor
Sun 15:00	0.94 · high	3.75 · good	28.20 · good	poor
Sun 16:00	0.94 · high	3.86 · good	28.20 · good	poor
Sun 17:00	0.92 · high	3.68 · good	28.10 · good	poor
Sun 18:00	0.92 · high	4.00 · good	28.10 · good	poor
Sun 19:00	0.92 · high	3.70 · good	28.00 · good	poor
Sun 20:00	0.92 · high	4.11 · good	28.00 · good	poor
Sun 21:00	0.92 · high	4.60 · good	27.90 · good	poor
Sun 22:00	0.92 · high	4.08 · good	27.90 · good	poor
Sun 23:00	0.90 · high	4.45 · good	27.90 · good	poor
Mon 00:00	0.90 · high	4.81 · good	27.90 · good	fair
Mon 01:00	0.90 · high	5.07 · good	28.00 · good	fair
Mon 02:00	0.92 · high	4.40 · good	28.10 · good	fair
Mon 03:00	0.92 · high	4.24 · good	28.30 · good	fair
Mon 04:00	0.94 · high	4.80 · good	28.40 · good	fair
Mon 05:00	0.96 · high	4.49 · good	28.50 · good	fair