Weather will likely play an important role when you plan your trip to Ogasawara, but bear 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 temperature of 28°C, while the coldest months are February and January, with an average of 19°C. The rainiest months in Ogasawara are October, May, September and August, with each month seeing an average of 185 mm of rainfall.