Weather is probably a major factor when you plan your trip to Botucatu, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and December with an average temp of 71°F, while the coldest months are July and June with an average of 63°F. The rainiest months in Botucatu are January, December, February, and March, with each month seeing an average of 12 inches of rainfall.