You might spend a lot of your holiday inside, but if you're planning to venture beyond the casino, looking at local weather trends is a good idea. The hottest months are usually August and July, with an average temperature of 27°C, while the coldest months are January and February, with an average of 17°C. The rainiest months in Amami are June, May, August and September, with each month seeing an average of 315 mm of rainfall.