# Hawaii water temperature Sea temperature at Hawaii is 27.9 °C (82.2 °F). - Location: Hawaii, USA - Timezone: Pacific/Honolulu - Source: Open-Meteo marine forecast (snapshot) - Generated at: 2026-09-26T21:10:50.933250-10:00 - Forecast page: https://snorkelforecast.com/usa/hawaii/ - HTML sea temperature: https://snorkelforecast.com/usa/hawaii/sea-temperature/ - Temperature is not a safety rating or snorkel score. - Guidance: Warm water - What to wear: Most people are comfortable in swimwear or a light rash guard. ## Monthly baseline - January: 25.4 °C (77.7 °F) - February: 24.8 °C (76.6 °F) - March: 25.0 °C (77.0 °F) - April: 25.3 °C (77.5 °F) - May: 26.1 °C (79.0 °F) - June: 26.6 °C (79.9 °F) - July: 26.9 °C (80.4 °F) - August: 27.3 °C (81.1 °F) - September: 27.5 °C (81.5 °F) - October: 27.3 °C (81.1 °F) - November: 26.6 °C (79.9 °F) - December: 25.9 °C (78.6 °F)