# Rottnest Island water temperature

Sea temperature at Rottnest Island is 18.8 °C (65.8 °F).

- Location: Rottnest Island, Australia
- Timezone: Australia/Brisbane
- Source: Open-Meteo marine forecast (snapshot)
- Generated at: 2026-09-23T00:52:49.222077+10:00
- Forecast page: https://snorkelforecast.com/australia/rottnest-island/
- HTML sea temperature: https://snorkelforecast.com/australia/rottnest-island/sea-temperature/
- Temperature is not a safety rating or snorkel score.
- Guidance: Cool water
- What to wear: A 3 mm shorty or full wetsuit will make longer snorkels more comfortable.

## Monthly baseline

- January: 22.5 °C (72.5 °F)
- February: 22.4 °C (72.3 °F)
- March: 22.6 °C (72.7 °F)
- April: 22.4 °C (72.3 °F)
- May: 22.1 °C (71.8 °F)
- June: 20.7 °C (69.3 °F)
- July: 19.3 °C (66.7 °F)
- August: 18.7 °C (65.7 °F)
- September: 18.5 °C (65.3 °F)
- October: 19.1 °C (66.4 °F)
- November: 19.9 °C (67.8 °F)
- December: 21.6 °C (70.9 °F)