Weather is probably a major factor when you plan your trip to Kumejima, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July, with an average temperature of 28°C, while the coldest months are January and February, with an average of 19°C. The rainiest months in Kumejima are June, May, August and September, with each month seeing an average of 287 mm of rainfall.