Weather is probably a major factor when you plan your trip to Shinjo-son, 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 6°C. The rainiest months in Shinjo-son are July, September, August and June, with each month seeing an average of 287 mm of rainfall.