Taking the local weather in Puerto Iguazú into account can help you maximise your time at the pool during your trip. The hottest months are usually January and December, with an average temperature of 26°C, while the coldest months are July and June, with an average of 18°C. The rainiest months in Puerto Iguazú are October, January, December and May, with each month seeing an average of 212 mm of rainfall.