Taking into account the local weather in Akigami Onsen is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually August and July with an average temp of 66°F, while the coldest months are January and February with an average of 27°F. The rainiest months in Akigami Onsen are July, September, August, and June, with each month seeing an average of 13 inches of rainfall.