Adjuntas Temperature At Adjuntas in Puerto Rico, for a period of record spanning 1971 – 2014 average annual 2m air temperature = 21.5 °C warmest year on record = 22.9 °C in 1998 coldest year on record = 19.3 °C in 1989 warmest month on average = 22.9 °C in June, July warmest month on …