If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Honjo: The hottest months are usually August and July, with an average temperature of 23°C, while the coldest months are January and February, with an average of 3°C. The rainiest months in Honjo are September, July, October and June, with each month seeing an average of 227 mm of rainfall.