Weather is probably a major factor when you plan your trip to Kamimoku 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 68°F, while the coldest months are January and February with an average of 32°F. The rainiest months in Kamimoku Onsen are July, September, October, and August, with each month seeing an average of 9 inches of rainfall.