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 Belo Horizonte: The hottest months are usually September and October, 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 Belo Horizonte are December, January, November and February, with each month seeing an average of 257 mm of rainfall.