Weather is probably a major factor when you plan your trip to Yaotsu, 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 24°C, while the coldest months are January and February, with an average of 4°C. The rainiest months in Yaotsu are July, September, June and August, with each month seeing an average of 267 mm of rainfall.