If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Ribeirao Preto: The hottest months are usually September and October, with an average temperature of 24°C, while the coldest months are June and July, with an average of 20°C. The rainiest months in Ribeirao Preto are January, December, November and February, with each month seeing an average of 225 mm of rainfall.