Weather will likely play an important role when you plan your trip to Kuroishi, 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 February and January, with an average of -2°C. The rainiest months in Kuroishi are August, July, September and October, with each month seeing an average of 197 mm of rainfall.