The Atlantic Ocean’s got a strong influence on the weather of the island. Ilha Grande has got a tropical temperature, usually hot and humid. The average temperature is between 22º Celsius – 27º Celsius
(76º Fahrenheit - 86º Fahrenheit). And the average water temperature is between 18º Celsius – 24º Celsius (68º Fahrenheit- 80º Fahrenheit).

According to the weather forecast station in Angra dos Reis, in one year we have about 180 to 200 days of sun. Average annual temperature of 22,5º Celsius (77º Fahrenheit), being Febuary the hottest month
(25,7º Celsius/83,4º Fahrenheit) and July the coldest
(19,6º Celsius/81,2º Fahrenheit).