Cayman Temperature In Cayman, for a period of record spanning 1971 – 2014 average annual 2m air temperature = 27.4 °C warmest year on record = 28.4 °C in 2003 coldest year on record = 26.1 °C in 1974 warmest month on average = 29.1 °C in July warmest month on record = 30.4 °C …