Weather will likely play an important role when you plan your trip to Ubasawa, 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 20°C, while the coldest months are February and January, with an average of -2°C. The rainiest months in Ubasawa are July, August, September and October, with each month seeing an average of 234 mm of rainfall.