# Rottnest Island snorkeling forecast

Rottnest Island looks marginal today. The least-bad daylight window is around Mon 19:00, but waves is limiting the forecast.

- Location: Rottnest Island, Australia
- Timezone: Australia/Brisbane
- Valid period: next 72 hours from 2026-09-21T18:56:17.764736+10:00
- Verdict: Marginal
- Score: 3.8/10
- Share of next 72h scored OK: 0%
- Source: snapshot
- Generated at: 2026-09-21T18:33:24.117204+10:00
- Conditions can change. HTML page: https://snorkelforecast.com/australia/rottnest-island/
- Forecast JSON: https://snorkelforecast.com/australia/rottnest-island/forecast.json
- Sea temperature: https://snorkelforecast.com/australia/rottnest-island/sea-temperature/
- Sea temperature markdown: https://snorkelforecast.com/australia/rottnest-island/sea-temperature.md
- History JSON: https://snorkelforecast.com/australia/rottnest-island/history.json
- Embed widget: https://snorkelforecast.com/australia/rottnest-island/embed/sea-temperature/
- Current sea temperature: 19.0 °C (66.2 °F)
- Baseline normal for month 9: 18.5 °C (65.3 °F) from 3 sample years
- Sea temperature versus month 9 normal: +0.5 °C (+0.9 °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 |
| --- | --- | --- | --- | --- | --- | --- |
| 2026-09-21T19:00:00+10:00 | fair | 0.38037962962962957 | no | 2.5 | 7.63 | 19.0 |
| 2026-09-21T20:00:00+10:00 | fair | 0.3657962962962963 | no | 2.48 | 8.26 | 19.0 |
| 2026-09-21T21:00:00+10:00 | poor | 0.0 | no | 2.48 | 8.65 | 18.9 |
| 2026-09-21T22:00:00+10:00 | poor | 0.0 | no | 2.46 | 8.75 | 18.9 |
| 2026-09-21T23:00:00+10:00 | poor | 0.0 | no | 2.44 | 8.87 | 18.9 |
| 2026-09-22T00:00:00+10:00 | poor | 0.0 | no | 2.4 | 8.53 | 18.8 |
| 2026-09-22T01:00:00+10:00 | poor | 0.0 | no | 2.38 | 8.51 | 18.8 |
| 2026-09-22T02:00:00+10:00 | poor | 0.0 | no | 2.34 | 8.33 | 18.8 |
| 2026-09-22T03:00:00+10:00 | poor | 0.0 | no | 2.32 | 7.77 | 18.8 |
| 2026-09-22T04:00:00+10:00 | poor | 0.0 | no | 2.28 | 7.11 | 18.8 |
| 2026-09-22T05:00:00+10:00 | poor | 0.0 | no | 2.24 | 6.74 | 18.8 |
| 2026-09-22T06:00:00+10:00 | poor | 0.0 | no | 2.2 | 6.34 | 18.7 |
| 2026-09-22T07:00:00+10:00 | poor | 0.0 | no | 2.16 | 5.93 | 18.7 |
| 2026-09-22T08:00:00+10:00 | poor | 0.0 | no | 2.12 | 5.71 | 18.7 |
| 2026-09-22T09:00:00+10:00 | poor | 0.0 | no | 2.1 | 6.25 | 18.7 |
| 2026-09-22T10:00:00+10:00 | fair | 0.4003981481481481 | no | 2.06 | 6.02 | 18.8 |
| 2026-09-22T11:00:00+10:00 | fair | 0.41099444444444444 | no | 2.04 | 5.64 | 18.9 |
| 2026-09-22T12:00:00+10:00 | fair | 0.4153407407407406 | no | 2.02 | 5.53 | 19.0 |
| 2026-09-22T13:00:00+10:00 | fair | 0.4260222222222222 | no | 2.0 | 5.25 | 19.1 |
| 2026-09-22T14:00:00+10:00 | fair | 0.43854629629629627 | no | 2.02 | 5.02 | 19.3 |
| 2026-09-22T15:00:00+10:00 | fair | 0.43340185185185176 | no | 2.02 | 5.32 | 19.4 |
| 2026-09-22T16:00:00+10:00 | fair | 0.40031296296296287 | no | 2.04 | 5.92 | 19.4 |
| 2026-09-22T17:00:00+10:00 | fair | 0.39960555555555544 | no | 2.04 | 6.78 | 19.4 |
| 2026-09-22T18:00:00+10:00 | fair | 0.41228703703703695 | no | 2.06 | 6.77 | 19.4 |

## Nearby spots

- [Agincourt Reef](https://snorkelforecast.com/australia/agincourt-reef/index.md)
- [Arlington Reef](https://snorkelforecast.com/australia/arlington-reef/index.md)
- [Byron Bay](https://snorkelforecast.com/australia/byron-bay/index.md)
- [Cairns](https://snorkelforecast.com/australia/cairns/index.md)