Can you snorkel in Jeju Island today?

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

What is the best time of day to snorkel in Jeju Island?

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 Jeju Island 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.

Jeju Island Snorkel Report Today

South Korea · Updated Tue 04:16 (KST) · Source: Snapshot · Showing fallback/stale data

The skinny

Marginal Report Thu 00:58

Jeju Island looks marginal today. The least-bad daylight window is around Thu 14:00, but waves is limiting the forecast.

Score: 5.1/10

Best time: Thu 14:00

Main risk: Waves

Best morning signal: Thu 11:00 (Fair).

Best afternoon signal: Thu 14:00 (Fair). Peak afternoon wind is about 4.0 m/s.

Email me when it is good

Sunrise

05:39

Sunset

19:40

Water

27.6°C

Max air

28.8°C

Sky

Clear

22% 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

Thursday

⚠️ fair conditions

Main blocker: Waves

Friday

⚠️ fair conditions

Main blocker: Waves

Best available hours

Thu 05:00 — Fair (0.51) · still limited by waves, tide/current
Thu 06:00 — Fair (0.50) · still limited by waves, tide/current
Fri 03:00 — Fair (0.50) · still limited by waves, tide/current

Why this verdict

Main blockers across the next 72 hours:

Waves (36 hours)
Tide/current (36 hours)
Darkness (21 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

Next early morning high tide: Wed 18:00

Wed 18:00, Thu 09:00, Thu 19:00

Nearby alternatives in South Korea

No nearby alternatives available.

Advanced forecast data

Viewing historical data

Thu 15:00 – Sun 15:00 (KST)

Previous day Yesterday Next day Live

Snorkel Score (selected 24h)

Best snorkel score is 0.38 around Fri 13:00; 3 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 0.62m to 0.9m).

Wind is at or below 5.4m/s in 12/24 sampled hours (range 1.6 to 9.4m/s).

Tides range from -0.81m to 1.41m; 1 of 24 hours are in or near peak slack windows.

72-hour historical overview

Thu 15:00 poor ❌ Limited

Thu 16:00 poor ❌ Limited

Thu 17:00 poor ❌ Limited

Thu 18:00 poor ❌ Limited

Thu 19:00 poor ❌ Limited

Thu 20:00 poor ❌ Limited

Thu 21:00 poor ❌ Limited

Thu 22:00 poor ❌ Limited

Thu 23:00 poor ❌ Limited

Fri 00:00 fair ⚠️ Fair

Fri 01:00 poor ❌ Limited

Fri 02:00 poor ❌ Limited

Fri 03:00 fair ⚠️ Fair

Fri 04:00 fair ⚠️ Fair

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 fair ⚠️ Fair

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 fair ⚠️ Fair

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

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
Thu 15:00	0.72 · high	2.50 · good	23.60 · good	poor
Thu 16:00	0.70 · high	2.20 · good	23.50 · good	poor
Thu 17:00	0.70 · high	1.90 · good	23.50 · good	poor
Thu 18:00	0.68 · high	3.30 · good	23.50 · good	poor
Thu 19:00	0.68 · high	5.20 · good	23.50 · good	poor
Thu 20:00	0.66 · high	1.90 · good	23.40 · good	poor
Thu 21:00	0.66 · high	1.60 · good	23.40 · good	poor
Thu 22:00	0.66 · high	5.40 · good	23.40 · good	poor
Thu 23:00	0.66 · high	5.80 · high	23.40 · good	poor
Fri 00:00	0.66 · high	6.20 · high	23.50 · good	fair
Fri 01:00	0.66 · high	5.40 · good	23.50 · good	poor
Fri 02:00	0.64 · high	6.10 · high	23.70 · good	poor
Fri 03:00	0.64 · high	5.40 · good	23.80 · good	fair
Fri 04:00	0.64 · high	4.00 · good	23.90 · good	fair
Fri 05:00	0.62 · high	6.20 · high	24.00 · good	poor
Fri 06:00	0.62 · high	7.50 · high	24.10 · good	poor
Fri 07:00	0.62 · high	7.10 · high	24.10 · good	poor
Fri 08:00	0.62 · high	9.40 · high	24.10 · good	poor
Fri 09:00	0.62 · high	6.60 · high	24.00 · good	poor
Fri 10:00	0.64 · high	6.90 · high	24.00 · good	poor
Fri 11:00	0.78 · high	8.10 · high	23.60 · good	poor
Fri 12:00	0.88 · high	7.00 · high	23.60 · good	poor
Fri 13:00	0.88 · high	6.00 · high	23.60 · good	poor
Fri 14:00	0.90 · high	3.60 · good	23.50 · good	poor
Fri 15:00	0.90 · high	7.20 · high	23.50 · good	poor
Fri 16:00	0.90 · high	8.00 · high	23.50 · good	poor
Fri 17:00	0.88 · high	8.40 · high	23.50 · good	poor
Fri 18:00	0.88 · high	10.50 · high	23.50 · good	poor
Fri 19:00	0.90 · high	15.30 · high	23.50 · good	poor
Fri 20:00	0.94 · high	18.30 · high	23.50 · good	poor
Fri 21:00	0.96 · high	20.40 · high	23.40 · good	poor
Fri 22:00	0.96 · high	25.20 · high	23.40 · good	poor
Fri 23:00	0.96 · high	25.40 · high	23.40 · good	poor
Sat 00:00	0.96 · high	26.00 · high	23.50 · good	poor
Sat 01:00	0.96 · high	23.20 · high	23.50 · good	poor
Sat 02:00	0.96 · high	20.50 · high	23.60 · good	poor
Sat 03:00	0.96 · high	19.90 · high	23.70 · good	poor
Sat 04:00	0.96 · high	18.80 · high	23.80 · good	poor
Sat 05:00	0.94 · high	18.90 · high	23.90 · good	poor
Sat 06:00	0.94 · high	19.30 · high	23.90 · good	poor
Sat 07:00	0.94 · high	18.30 · high	23.90 · good	poor
Sat 08:00	0.92 · high	19.20 · high	23.90 · good	poor
Sat 09:00	0.92 · high	17.70 · high	23.90 · good	poor
Sat 10:00	0.92 · high	16.80 · high	23.90 · good	poor
Sat 11:00	0.94 · high	14.90 · high	23.90 · good	poor
Sat 12:00	0.94 · high	13.90 · high	23.80 · good	poor
Sat 13:00	0.94 · high	11.90 · high	23.80 · good	poor
Sat 14:00	0.94 · high	11.30 · high	23.80 · good	poor
Sat 15:00	0.94 · high	9.80 · high	23.70 · good	poor
Sat 16:00	0.94 · high	8.70 · high	23.70 · good	poor
Sat 17:00	0.92 · high	8.30 · high	23.70 · good	poor
Sat 18:00	0.92 · high	5.80 · high	23.70 · good	poor
Sat 19:00	0.92 · high	5.00 · good	23.70 · good	poor
Sat 20:00	0.90 · high	2.90 · good	23.70 · good	poor
Sat 21:00	0.90 · high	1.50 · good	23.70 · good	poor
Sat 22:00	0.88 · high	3.60 · good	23.70 · good	poor
Sat 23:00	0.84 · high	2.90 · good	23.70 · good	poor
Sun 00:00	0.82 · high	2.50 · good	23.70 · good	poor
Sun 01:00	0.82 · high	4.40 · good	23.80 · good	fair
Sun 02:00	0.80 · high	6.70 · high	23.80 · good	poor
Sun 03:00	0.80 · high	7.60 · high	23.80 · good	poor
Sun 04:00	0.82 · high	7.30 · high	23.90 · good	poor
Sun 05:00	0.84 · high	9.40 · high	23.90 · good	poor
Sun 06:00	0.86 · high	9.70 · high	23.90 · good	poor
Sun 07:00	0.88 · high	8.80 · high	23.90 · good	poor
Sun 08:00	0.88 · high	5.90 · high	23.90 · good	poor
Sun 09:00	0.90 · high	4.10 · good	23.90 · good	fair
Sun 10:00	0.94 · high	4.40 · good	23.90 · good	poor
Sun 11:00	0.98 · high	2.70 · good	23.90 · good	poor
Sun 12:00	1.02 · high	2.40 · good	23.90 · good	poor
Sun 13:00	1.06 · high	4.00 · good	23.90 · good	poor
Sun 14:00	1.10 · high	7.40 · high	23.80 · good	poor