Weather will likely play an important role when you plan your trip to Kawashira, 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 18°C, while the coldest months are January and February, with an average of -2°C. The snowiest months in Kawashira are January, February, March and December, with each month seeing an average of 77 cm of snowfall.