Planning for the weather is a good way to make your trip to Aogashima relaxing and enjoyable, especially when you're splurging. 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.