Weather will likely play an important role when you plan your trip to Miyakejima, 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 25°C, while the coldest months are January and February, with an average of 13°C. The rainiest months in Miyakejima are June, October, September and November, with each month seeing an average of 302 mm of rainfall.