# Tumon Bay water temperature

Sea temperature at Tumon Bay is 29.8 °C (85.6 °F).

- Location: Tumon Bay, Guam
- Timezone: Pacific/Guam
- Source: Open-Meteo marine forecast (snapshot)
- Generated at: 2026-09-27T00:06:08.524701+10:00
- Forecast page: https://snorkelforecast.com/guam/tumon-bay/
- HTML sea temperature: https://snorkelforecast.com/guam/tumon-bay/sea-temperature/
- Temperature is not a safety rating or snorkel score.
- Guidance: Very warm water
- What to wear: Swimwear is usually enough; a rash guard adds sun protection.

## Monthly baseline

- January: 28.7 °C (83.7 °F)
- February: 28.1 °C (82.6 °F)
- March: 28.3 °C (82.9 °F)
- April: 28.6 °C (83.5 °F)
- May: 29.1 °C (84.4 °F)
- June: 29.5 °C (85.1 °F)
- July: 29.8 °C (85.6 °F)
- August: 30.1 °C (86.2 °F)
- September: 29.9 °C (85.8 °F)
- October: 29.8 °C (85.6 °F)
- November: 29.4 °C (84.9 °F)
- December: 29.1 °C (84.4 °F)