# Similan Islands snorkeling forecast

Similan Islands has a usable snorkeling window around Sun 07:00. The main thing to watch is sea temperature.

- Location: Similan Islands, Thailand
- Timezone: Asia/Bangkok
- Valid period: next 72 hours from 2026-10-18T05:28:25.414469+07:00
- Verdict: Go in the best window
- Score: 6.7/10
- Share of next 72h scored OK: 46%
- Source: snapshot
- Generated at: 2026-10-18T02:52:56.902014+07:00
- Conditions can change. HTML page: https://snorkelforecast.com/thailand/similan-islands/
- Forecast JSON: https://snorkelforecast.com/thailand/similan-islands/forecast.json
- Sea temperature: https://snorkelforecast.com/thailand/similan-islands/sea-temperature/
- Sea temperature markdown: https://snorkelforecast.com/thailand/similan-islands/sea-temperature.md
- History JSON: https://snorkelforecast.com/thailand/similan-islands/history.json
- Embed widget: https://snorkelforecast.com/thailand/similan-islands/embed/sea-temperature/
- Current sea temperature: 30.3 °C (86.5 °F)
- Baseline normal for month 10: 29.2 °C (84.6 °F) from 3 sample years
- Sea temperature versus month 10 normal: +1.1 °C (+2.0 °F), warmer 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 |
| --- | --- | --- | --- | --- | --- | --- |
| 2026-10-18T06:00:00+07:00 | poor | 0.0 | no | 0.36 | 1.35 | 30.3 |
| 2026-10-18T07:00:00+07:00 | good | 0.6281481481481481 | yes | 0.36 | 0.89 | 30.3 |
| 2026-10-18T08:00:00+07:00 | good | 0.6101777777777777 | yes | 0.36 | 1.77 | 30.4 |
| 2026-10-18T09:00:00+07:00 | good | 0.629724074074074 | yes | 0.36 | 1.93 | 30.4 |
| 2026-10-18T10:00:00+07:00 | good | 0.6249944444444443 | yes | 0.36 | 1.59 | 30.5 |
| 2026-10-18T11:00:00+07:00 | good | 0.6164814814814814 | yes | 0.36 | 1.88 | 30.6 |
| 2026-10-18T12:00:00+07:00 | good | 0.614237037037037 | yes | 0.36 | 1.64 | 30.7 |
| 2026-10-18T13:00:00+07:00 | good | 0.6682648148148147 | yes | 0.36 | 1.25 | 30.7 |
| 2026-10-18T14:00:00+07:00 | good | 0.6467870370370369 | yes | 0.36 | 0.83 | 30.7 |
| 2026-10-18T15:00:00+07:00 | good | 0.648724074074074 | yes | 0.36 | 0.85 | 30.7 |
| 2026-10-18T16:00:00+07:00 | good | 0.6363203703703703 | yes | 0.36 | 0.2 | 30.7 |
| 2026-10-18T17:00:00+07:00 | good | 0.6260925925925925 | yes | 0.36 | 0.59 | 30.7 |
| 2026-10-18T18:00:00+07:00 | good | 0.625861111111111 | yes | 0.36 | 0.6 | 30.7 |
| 2026-10-18T19:00:00+07:00 | poor | 0.0 | no | 0.36 | 0.47 | 30.6 |
| 2026-10-18T20:00:00+07:00 | poor | 0.0 | no | 0.36 | 0.85 | 30.6 |
| 2026-10-18T21:00:00+07:00 | poor | 0.0 | no | 0.38 | 0.4 | 30.6 |
| 2026-10-18T22:00:00+07:00 | poor | 0.0 | no | 0.38 | 1.67 | 30.6 |
| 2026-10-18T23:00:00+07:00 | poor | 0.0 | no | 0.38 | 0.59 | 30.5 |
| 2026-10-19T00:00:00+07:00 | poor | 0.0 | no | 0.38 | 0.1 | 30.5 |
| 2026-10-19T01:00:00+07:00 | poor | 0.0 | no | 0.38 | 0.4 | 30.5 |
| 2026-10-19T02:00:00+07:00 | poor | 0.0 | no | 0.38 | 1.82 | 30.4 |
| 2026-10-19T03:00:00+07:00 | poor | 0.0 | no | 0.38 | 0.61 | 30.3 |
| 2026-10-19T04:00:00+07:00 | poor | 0.0 | no | 0.38 | 0.47 | 30.3 |
| 2026-10-19T05:00:00+07:00 | poor | 0.0 | no | 0.38 | 1.32 | 30.2 |

## Nearby spots

- [Koh Kradan](https://snorkelforecast.com/thailand/koh-kradan/index.md)
- [Koh Lipe](https://snorkelforecast.com/thailand/koh-lipe/index.md)
- [Koh Phi Phi](https://snorkelforecast.com/thailand/koh-phi-phi/index.md)
- [Koh Tao](https://snorkelforecast.com/thailand/koh-tao/index.md)