Visiting local bars in Itacoatiara is more fun when you know what the weather holds. These temperatures and rainfall averages can help you choose the best time for bar hopping. The hottest months are usually September and October with an average temp of 84°F, while the coldest months are June and January with an average of 79°F. The rainiest months in Itacoatiara are March, April, February, and January, with each month seeing an average of 15 inches of rainfall.