Weather is probably a major factor when you plan your trip to Yonago, 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 74°F, while the coldest months are January and February with an average of 43°F. The rainiest months in Yonago are July, September, August, and June, with each month seeing an average of 10 inches of rainfall.