Weather is probably a major factor when you plan your trip to Arutanga, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually March and February with an average temp of 81°F, while the coldest months are August and September with an average of 76°F. The rainiest months in Arutanga are January, February, December, and March, with each month seeing an average of 10 inches of rainfall.