If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Juiz de Fora: 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 17°C. The rainiest months in Juiz de Fora are December, January, November and February, with each month seeing an average of 333 mm of rainfall.