If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Franca: The hottest months are usually September and October with an average temp of 72°F, while the coldest months are July and June with an average of 66°F. The rainiest months in Franca are December, January, November, and February, with each month seeing an average of 11 inches of rainfall.