Taking the local weather in Itacoatiara into account can help you maximise your time at the pool during your trip. The hottest months are usually September and October, with an average temperature of 29°C, while the coldest months are June and January, with an average of 26°C. The rainiest months in Itacoatiara are March, April, February and January, with each month seeing an average of 386 mm of rainfall.