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 Santo André: The hottest months are usually February and January, with an average temperature of 23°C, while the coldest months are July and June, with an average of 18°C. The rainiest months in Santo André are January, February, December and March, with each month seeing an average of 302 mm of rainfall.