Weather will likely play an important role when you plan your trip to Aogashima, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and September with an average temp of 79°F, while the coldest months are January and February with an average of 57°F. The rainiest months in Aogashima are June, October, September, and March, with each month seeing an average of 12 inches of rainfall.