Weather is probably a major factor when you plan your trip to Miyakonojo, 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 8°C. The rainiest months in Miyakonojo are June, July, September and May, with each month seeing an average of 382 mm of rainfall.