If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Yonago: 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 6°C. The rainiest months in Yonago are July, September, August and June, with each month seeing an average of 264 mm of rainfall.