Weather is probably a major factor when you plan your trip to Shirakawa, 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 19°C, while the coldest months are January and February, with an average of -3°C. The rainiest months in Shirakawa are July, September, August and June, with each month seeing an average of 333 mm of rainfall.