Weather will likely play an important role when you plan your trip to Imperatriz, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually September and August, with an average temperature of 29°C, while the coldest months are July and June, with an average of 26°C. The rainiest months in Imperatriz are March, February, January and April, with each month seeing an average of 256 mm of rainfall.