If you're hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Hienghene: The hottest months are usually February and January, with an average temperature of 25°C, while the coldest months are August and September, with an average of 21°C. The rainiest months in Hienghene are March, January, February and April, with each month seeing an average of 182 mm of rainfall.