Weather is probably a major factor when you plan your trip to Minami-Alps, 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 70°F, while the coldest months are January and February with an average of 35°F. The rainiest months in Minami-Alps are September, July, October, and June, with each month seeing an average of 11 inches of rainfall.