# Jeju Island snorkeling forecast

Jeju Island looks marginal today. The least-bad daylight window is around Sat 17:00, but waves is limiting the forecast.

- Location: Jeju Island, South Korea
- Timezone: Asia/Seoul
- Valid period: next 72 hours from 2026-10-17T11:35:55.871003+09:00
- Verdict: Marginal
- Score: 3.8/10
- Share of next 72h scored OK: 1%
- Source: snapshot
- Generated at: 2026-10-17T10:01:56.245713+09:00
- Conditions can change. HTML page: https://snorkelforecast.com/south-korea/jeju-island/
- Forecast JSON: https://snorkelforecast.com/south-korea/jeju-island/forecast.json
- Sea temperature: https://snorkelforecast.com/south-korea/jeju-island/sea-temperature/
- Sea temperature markdown: https://snorkelforecast.com/south-korea/jeju-island/sea-temperature.md
- History JSON: https://snorkelforecast.com/south-korea/jeju-island/history.json
- Embed widget: https://snorkelforecast.com/south-korea/jeju-island/embed/sea-temperature/
- Current sea temperature: 25.3 °C (77.5 °F)
- Baseline normal for month 10: 26.1 °C (79.0 °F) from 3 sample years
- Sea temperature versus month 10 normal: -0.8 °C (-1.4 °F), cooler than the stored baseline
- Scoring thresholds: waves <= 0.36 m, wind <= 5.4 m/s, current <= 0.36 m/s, water 20.6-30.4 °C. Forecast thresholds, not official safety limits.

## Next 24 hours

| time | rating | score | ok | waves_m | wind_mps | sst_c |
| --- | --- | --- | --- | --- | --- | --- |
| 2026-10-17T12:00:00+09:00 | fair | 0.37328888888888884 | no | 1.2 | 6.42 | 25.3 |
| 2026-10-17T13:00:00+09:00 | fair | 0.3737092592592593 | no | 1.22 | 6.35 | 25.3 |
| 2026-10-17T14:00:00+09:00 | fair | 0.3508481481481482 | no | 1.24 | 6.56 | 25.3 |
| 2026-10-17T15:00:00+09:00 | poor | 0.27829999999999994 | no | 1.26 | 6.48 | 25.3 |
| 2026-10-17T16:00:00+09:00 | poor | 0.3375203703703704 | no | 1.26 | 6.41 | 25.3 |
| 2026-10-17T17:00:00+09:00 | fair | 0.3759999999999999 | no | 1.24 | 5.94 | 25.3 |
| 2026-10-17T18:00:00+09:00 | poor | 0.0 | no | 1.24 | 5.55 | 25.3 |
| 2026-10-17T19:00:00+09:00 | poor | 0.0 | no | 1.22 | 5.02 | 25.2 |
| 2026-10-17T20:00:00+09:00 | poor | 0.0 | no | 1.22 | 4.59 | 25.2 |
| 2026-10-17T21:00:00+09:00 | poor | 0.0 | no | 1.2 | 4.18 | 25.2 |
| 2026-10-17T22:00:00+09:00 | poor | 0.0 | no | 1.2 | 4.16 | 25.2 |
| 2026-10-17T23:00:00+09:00 | poor | 0.0 | no | 1.2 | 3.3 | 25.2 |
| 2026-10-18T00:00:00+09:00 | poor | 0.0 | no | 1.2 | 3.03 | 25.2 |
| 2026-10-18T01:00:00+09:00 | poor | 0.0 | no | 1.3 | 2.45 | 25.2 |
| 2026-10-18T02:00:00+09:00 | poor | 0.0 | no | 1.42 | 2.42 | 25.2 |
| 2026-10-18T03:00:00+09:00 | poor | 0.0 | no | 1.52 | 3.58 | 25.2 |
| 2026-10-18T04:00:00+09:00 | poor | 0.0 | no | 1.56 | 4.09 | 25.2 |
| 2026-10-18T05:00:00+09:00 | poor | 0.0 | no | 1.6 | 3.22 | 25.2 |
| 2026-10-18T06:00:00+09:00 | poor | 0.0 | no | 1.64 | 2.69 | 25.2 |
| 2026-10-18T07:00:00+09:00 | poor | 0.0 | no | 1.64 | 2.91 | 25.2 |
| 2026-10-18T08:00:00+09:00 | poor | 0.0 | no | 1.64 | 3.1 | 25.2 |
| 2026-10-18T09:00:00+09:00 | fair | 0.3817277777777778 | no | 1.64 | 3.93 | 25.2 |
| 2026-10-18T10:00:00+09:00 | fair | 0.38240370370370363 | no | 1.64 | 4.16 | 25.2 |
| 2026-10-18T11:00:00+09:00 | fair | 0.44362962962962954 | no | 1.64 | 4.12 | 25.2 |