Can you snorkel in Kerama Islands today?

Yes. The next good snorkeling window in Kerama Islands starts Wed 04:00 and lasts until 10:00. Around 37% of the next 72 hours are suitable.

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 Tue 04:14 (JST) · Source: Snapshot

The skinny

Go in the best window Report Wed 11:22

Kerama Islands has a usable snorkeling window around Wed 13:00. The main thing to watch is waves.

Score: 6.8/10

Best time: Wed 13:00

Main risk: Waves

No useful morning window is showing yet.

Best afternoon signal: Wed 14:00 (Good). Peak afternoon wind is about 2.2 m/s.

Email me when it is good

Sunrise

05:51

Sunset

19:23

Water

29.0°C

Max air

28.1°C

Sky

Clear

5% cloud

Good window is available today

Next safe window: Wed 04:00–10:00 (37% 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 04:00 until 10:00.

Why this verdict

Main blockers across the next 72 hours:

Waves (49 hours)
Tide/current (44 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.

Upcoming high tides

Wed 04:00

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

Fri 02:00 – Mon 02:00 (JST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.17 around Fri 11:00; 0 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 5.8m to 7.32m).

Wind is at or below 5.4m/s in 0/24 sampled hours (range 14.87 to 24.01m/s).

Tides range from 0.21m to 1.77m; 1 of 24 hours are in or near peak slack windows.

72-hour historical overview

Fri 02:00 poor ❌ Limited

Fri 03:00 poor ❌ Limited

Fri 04:00 poor ❌ Limited

Fri 05:00 poor ❌ Limited

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 poor ❌ Limited

Sat 02:00 poor ❌ Limited

Sat 03:00 poor ❌ Limited

Sat 04:00 poor ❌ Limited

Sat 05:00 poor ❌ Limited

Sat 06:00 poor ❌ Limited

Sat 07:00 poor ❌ Limited

Sat 08:00 poor ❌ Limited

Sat 09:00 poor ❌ Limited

Sat 10:00 poor ❌ Limited

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 poor ❌ Limited

Sun 01:00 poor ❌ Limited

Sun 02:00 poor ❌ Limited

Sun 03:00 poor ❌ Limited

Sun 04:00 poor ❌ Limited

Sun 05:00 poor ❌ Limited

Sun 06:00 poor ❌ Limited

Sun 07:00 poor ❌ Limited

Sun 08:00 poor ❌ Limited

Sun 09:00 poor ❌ Limited

Sun 10:00 poor ❌ Limited

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 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
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
Fri 07:00	6.56 · high	20.86 · high	28.60 · good	poor
Fri 08:00	6.80 · high	19.55 · high	28.50 · good	poor
Fri 09:00	7.04 · high	19.12 · high	28.50 · good	poor
Fri 10:00	7.14 · high	19.40 · high	28.40 · good	poor
Fri 11:00	7.22 · high	22.14 · high	28.40 · good	poor
Fri 12:00	7.32 · high	23.20 · high	28.30 · good	poor
Fri 13:00	7.30 · high	22.46 · high	28.30 · good	poor
Fri 14:00	7.28 · high	22.90 · high	28.20 · good	poor
Fri 15:00	7.26 · high	22.42 · high	28.20 · good	poor
Fri 16:00	7.28 · high	24.01 · high	28.20 · good	poor
Fri 17:00	7.28 · high	22.78 · high	28.10 · good	poor
Fri 18:00	7.30 · high	20.22 · high	28.10 · good	poor
Fri 19:00	7.18 · high	21.64 · high	28.00 · good	poor
Fri 20:00	7.06 · high	20.96 · high	28.00 · good	poor
Fri 21:00	6.94 · high	22.41 · high	27.90 · good	poor
Fri 22:00	6.78 · high	21.58 · high	27.90 · good	poor
Fri 23:00	6.60 · high	21.17 · high	27.90 · good	poor
Sat 00:00	6.44 · high	20.55 · high	27.80 · good	poor
Sat 01:00	6.24 · high	18.52 · high	27.80 · good	poor
Sat 02:00	6.06 · high	18.96 · high	27.80 · good	poor
Sat 03:00	5.86 · high	20.16 · high	27.80 · good	poor
Sat 04:00	5.66 · high	18.82 · high	27.80 · good	poor
Sat 05:00	5.48 · high	17.57 · high	27.80 · good	poor
Sat 06:00	5.28 · high	18.22 · high	27.80 · good	poor
Sat 07:00	5.10 · high	17.34 · high	27.80 · good	poor
Sat 08:00	4.90 · high	17.05 · high	27.80 · good	poor
Sat 09:00	4.72 · high	16.07 · high	27.80 · good	poor
Sat 10:00	4.60 · high	15.41 · high	27.70 · good	poor
Sat 11:00	4.48 · high	15.28 · high	27.70 · good	poor
Sat 12:00	4.36 · high	14.44 · high	27.70 · good	poor
Sat 13:00	4.28 · high	13.65 · high	27.70 · good	poor
Sat 14:00	4.20 · high	13.62 · high	27.70 · good	poor
Sat 15:00	4.12 · high	13.40 · high	27.70 · good	poor
Sat 16:00	4.06 · high	12.66 · high	27.70 · good	poor
Sat 17:00	3.98 · high	12.62 · high	27.60 · good	poor
Sat 18:00	3.92 · high	12.22 · high	27.60 · good	poor
Sat 19:00	3.82 · high	12.01 · high	27.60 · good	poor
Sat 20:00	3.72 · high	12.02 · high	27.60 · good	poor
Sat 21:00	3.62 · high	11.72 · high	27.60 · good	poor
Sat 22:00	3.52 · high	11.20 · high	27.50 · good	poor
Sat 23:00	3.44 · high	10.60 · high	27.50 · good	poor
Sun 00:00	3.34 · high	10.83 · high	27.50 · good	poor
Sun 01:00	3.22 · high	9.83 · high	27.50 · good	poor
Sun 02:00	3.12 · high	9.36 · high	27.60 · good	poor
Sun 03:00	3.00 · high	9.19 · high	27.60 · good	poor
Sun 04:00	2.88 · high	9.04 · high	27.70 · good	poor
Sun 05:00	2.78 · high	9.08 · high	27.70 · good	poor
Sun 06:00	2.66 · high	9.06 · high	27.80 · good	poor
Sun 07:00	2.58 · high	9.49 · high	27.80 · good	poor
Sun 08:00	2.96 · high	10.04 · high	26.60 · good	poor
Sun 09:00	2.88 · high	10.03 · high	26.60 · good	poor
Sun 10:00	2.82 · high	9.87 · high	26.60 · good	poor
Sun 11:00	2.76 · high	9.74 · high	26.50 · good	poor
Sun 12:00	2.70 · high	10.00 · high	26.50 · good	poor
Sun 13:00	2.66 · high	9.97 · high	26.50 · good	poor
Sun 14:00	2.60 · high	10.32 · high	26.50 · good	poor
Sun 15:00	2.56 · high	10.67 · high	26.50 · good	poor
Sun 16:00	2.50 · high	10.05 · high	26.50 · good	poor
Sun 17:00	2.46 · high	9.70 · high	26.50 · good	poor
Sun 18:00	2.40 · high	9.63 · high	26.50 · good	poor
Sun 19:00	2.34 · high	9.07 · high	26.50 · good	poor
Sun 20:00	2.26 · high	8.41 · high	26.50 · good	poor
Sun 21:00	2.20 · high	7.97 · high	26.50 · good	poor
Sun 22:00	2.16 · high	7.59 · high	26.50 · good	poor
Sun 23:00	2.10 · high	7.68 · high	26.50 · good	poor
Mon 00:00	2.06 · high	7.75 · high	26.50 · good	fair
Mon 01:00	2.02 · high	8.21 · high	26.60 · good	poor