If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Visconde de Mauá: The hottest months are usually February and January, with an average temperature of 22°C, while the coldest months are July and June, with an average of 18°C. The rainiest months in Visconde de Mauá are January, December, March and February, with each month seeing an average of 269 mm of rainfall.