Planning for the weather is a good way to make your trip to Manaus relaxing and enjoyable, especially when you’re splurging. The hottest months are usually September and October, with an average temperature of 29°C, while the coldest months are June and April, with an average of 26°C. The rainiest months in Manaus are April, March, February and May, with each month seeing an average of 391 mm of rainfall.