# Tumon Bay snorkeling forecast

Tumon Bay has no good model window later today. Check the three-day outlook and official beach advisories.

- Location: Tumon Bay, Guam
- Timezone: Pacific/Guam
- Valid period: next 72 hours from 2026-10-17T18:20:48.091761+10:00
- Verdict: Poor
- Score: 0.0/10
- Share of next 72h scored OK: 0%
- Source: snapshot
- Generated at: 2026-10-17T16:41:57.269086+10:00
- Conditions can change. HTML page: https://snorkelforecast.com/guam/tumon-bay/
- Forecast JSON: https://snorkelforecast.com/guam/tumon-bay/forecast.json
- Sea temperature: https://snorkelforecast.com/guam/tumon-bay/sea-temperature/
- Sea temperature markdown: https://snorkelforecast.com/guam/tumon-bay/sea-temperature.md
- History JSON: https://snorkelforecast.com/guam/tumon-bay/history.json
- Embed widget: https://snorkelforecast.com/guam/tumon-bay/embed/sea-temperature/
- Current sea temperature: 29.4 °C (84.9 °F)
- Baseline normal for month 10: 29.8 °C (85.6 °F) from 3 sample years
- Sea temperature versus month 10 normal: -0.4 °C (-0.7 °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 |
| --- | --- | --- | --- | --- | --- | --- |
| 2026-10-17T19:00:00+10:00 | poor | 0.0 | no | 2.7 | 11.12 | 29.4 |
| 2026-10-17T20:00:00+10:00 | poor | 0.0 | no | 2.88 | 11.47 | 29.4 |
| 2026-10-17T21:00:00+10:00 | poor | 0.0 | no | 3.04 | 12.52 | 29.4 |
| 2026-10-17T22:00:00+10:00 | poor | 0.0 | no | 3.22 | 13.71 | 29.4 |
| 2026-10-17T23:00:00+10:00 | poor | 0.0 | no | 3.5 | 14.69 | 29.4 |
| 2026-10-18T00:00:00+10:00 | poor | 0.0 | no | 3.76 | 14.38 | 29.3 |
| 2026-10-18T01:00:00+10:00 | poor | 0.0 | no | 4.04 | 14.67 | 29.3 |
| 2026-10-18T02:00:00+10:00 | poor | 0.0 | no | 4.38 | 15.35 | 29.3 |
| 2026-10-18T03:00:00+10:00 | poor | 0.0 | no | 4.7 | 17.17 | 29.3 |
| 2026-10-18T04:00:00+10:00 | poor | 0.0 | no | 5.04 | 17.86 | 29.2 |
| 2026-10-18T05:00:00+10:00 | poor | 0.0 | no | 5.3 | 16.94 | 29.2 |
| 2026-10-18T06:00:00+10:00 | poor | 0.0 | no | 5.58 | 19.89 | 29.2 |
| 2026-10-18T07:00:00+10:00 | poor | 0.0 | no | 5.84 | 16.35 | 29.2 |
| 2026-10-18T08:00:00+10:00 | poor | 0.0 | no | 5.98 | 19.47 | 29.1 |
| 2026-10-18T09:00:00+10:00 | poor | 0.0 | no | 6.1 | 17.4 | 29.1 |
| 2026-10-18T10:00:00+10:00 | poor | 0.16749999999999998 | no | 6.24 | 17.88 | 29.1 |
| 2026-10-18T11:00:00+10:00 | poor | 0.16749999999999998 | no | 5.84 | 16.64 | 29.0 |
| 2026-10-18T12:00:00+10:00 | poor | 0.16749999999999998 | no | 5.42 | 16.46 | 29.0 |
| 2026-10-18T13:00:00+10:00 | poor | 0.16749999999999998 | no | 5.02 | 16.63 | 29.0 |
| 2026-10-18T14:00:00+10:00 | poor | 0.16749999999999998 | no | 4.8 | 16.88 | 28.9 |
| 2026-10-18T15:00:00+10:00 | poor | 0.16749999999999998 | no | 4.6 | 15.55 | 28.9 |
| 2026-10-18T16:00:00+10:00 | poor | 0.16749999999999998 | no | 4.38 | 14.98 | 28.8 |
| 2026-10-18T17:00:00+10:00 | poor | 0.16749999999999998 | no | 4.24 | 14.66 | 28.8 |
| 2026-10-18T18:00:00+10:00 | poor | 0.16749999999999998 | no | 4.12 | 13.61 | 28.8 |