Weather will likely play an important role when you plan your trip to South Molle Island, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually December and January, with an average temperature of 26°C, while the coldest months are July and June, with an average of 19°C. The rainiest months in South Molle Island are February, January, March and December, with each month seeing an average of 222 mm of rainfall.