Planning for the weather is an important factor for making your trip to Minami-Alps a success, especially when you’re splurging. 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.