Weather is probably a major factor when you plan your trip to Panamá, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and October with an average temp of 79°F, while the coldest months are July and June with an average of 73°F. The rainiest months in Panamá are December, January, November, and February, with each month seeing an average of 9 inches of rainfall.