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 Shibata: The hottest months are usually August and July, with an average temperature of 23°C, while the coldest months are February and January, with an average of 3°C. The rainiest months in Shibata are July, December, January and August, with each month seeing an average of 257 mm of rainfall.