# Green Island water temperature Sea temperature at Green Island is 23.8 °C (74.8 °F). - Location: Green Island, Australia - Timezone: Australia/Brisbane - Source: Open-Meteo marine forecast (snapshot) - Generated at: 2026-09-27T00:06:59.190492+10:00 - Forecast page: https://snorkelforecast.com/australia/green-island/ - HTML sea temperature: https://snorkelforecast.com/australia/green-island/sea-temperature/ - Temperature is not a safety rating or snorkel score. - Guidance: Mild water - What to wear: A rash guard is useful; cold-sensitive snorkelers may prefer a shorty wetsuit. ## Monthly baseline - January: 29.7 °C (85.5 °F) - February: 29.6 °C (85.3 °F) - March: 29.1 °C (84.4 °F) - April: 28.4 °C (83.1 °F) - May: 25.9 °C (78.6 °F) - June: 24.5 °C (76.1 °F) - July: 23.9 °C (75.0 °F) - August: 23.5 °C (74.3 °F) - September: 24.6 °C (76.3 °F) - October: 26.3 °C (79.3 °F) - November: 28.0 °C (82.4 °F) - December: 29.0 °C (84.2 °F)