When you're traveling with pets, keeping tabs on the weather can make the trip safe and fun for everyone. The hottest months are usually September and October with an average temp of 69°F, while the coldest months are July and August with an average of 63°F. The rainiest months in São Gonçalo do Rio das Pedras are December, November, January, and March, with each month seeing an average of 11 inches of rainfall.