Weather will likely play an important role when you plan your trip to Yamanokuchi-cho, but bear 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 temperature of 25°C, while the coldest months are January and February, with an average of 10°C. The rainiest months in Yamanokuchi-cho are June, July, May and September, with each month seeing an average of 411 mm of rainfall.