If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Sao Jose: The hottest months are usually January and February with an average temp of 74°F, while the coldest months are July and June with an average of 62°F. The rainiest months in Sao Jose are January, February, December, and March, with each month seeing an average of 9 inches of rainfall.