Weather is probably a major factor when you plan your trip to Barretos, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and October, with an average temperature of 25°C, while the coldest months are June and July, with an average of 21°C. The rainiest months in Barretos are January, December, November and March, with each month seeing an average of 231 mm of rainfall.