Weather will likely play an important role when you plan your trip to Minamisatsuma, and keep 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 temp of 79°F, while the coldest months are January and February with an average of 57°F. The rainiest months in Minamisatsuma are June, September, July, and May, with each month seeing an average of 15 inches of rainfall.