# Grand Cayman water temperature

Sea temperature at Grand Cayman is 30.3 °C (86.5 °F).

- Location: Grand Cayman, Cayman Islands
- Timezone: America/Cayman
- Source: Open-Meteo marine forecast (snapshot)
- Generated at: 2026-09-22T09:53:23.098269-05:00
- Forecast page: https://snorkelforecast.com/cayman-islands/grand-cayman/
- HTML sea temperature: https://snorkelforecast.com/cayman-islands/grand-cayman/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: 27.4 °C (81.3 °F)
- February: 26.8 °C (80.2 °F)
- March: 27.6 °C (81.7 °F)
- April: 28.1 °C (82.6 °F)
- May: 29.3 °C (84.7 °F)
- June: 29.7 °C (85.5 °F)
- July: 30.1 °C (86.2 °F)
- August: 30.7 °C (87.3 °F)
- September: 30.9 °C (87.6 °F)
- October: 30.4 °C (86.7 °F)
- November: 29.0 °C (84.2 °F)
- December: 28.2 °C (82.8 °F)