If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Ribeirão Preto: The hottest months are usually September and October with an average temp of 75°F, while the coldest months are June and July with an average of 69°F. The rainiest months in Ribeirão Preto are January, December, November, and February, with each month seeing an average of 9 inches of rainfall.