Weather will likely play an important role when you plan your trip to Kyomachi Onsen, 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 75°F, while the coldest months are January and February with an average of 46°F. The rainiest months in Kyomachi Onsen are June, July, May, and September, with each month seeing an average of 16 inches of rainfall.