Weather is probably a major factor when you plan your trip to Hirosaki, 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 -1°C. The rainiest months in Hirosaki are August, December, July and September, with each month seeing an average of 204 mm of rainfall.