Weather will likely play an important role when you plan your trip to Olímpia, 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 77°F, while the coldest months are June and July with an average of 70°F. The rainiest months in Olímpia are January, December, February, and November, with each month seeing an average of 9 inches of rainfall.