If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Boituva: The hottest months are usually December and September, 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 Boituva are January, December, November and February, with each month seeing an average of 204 mm of rainfall.