Weather will likely play an important role when you plan your trip to Copacabana, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually November and October with an average temp of 47°F, while the coldest months are June and July with an average of 42°F. The rainiest months in Copacabana are January, February, December, and March, with each month seeing an average of 8 inches of rainfall.