Weather will likely play an important role when you plan your trip to Amazon Bay, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually January and February, with an average temperature of 27°C, while the coldest months are August and July, with an average of 25°C. The rainiest months in Amazon Bay are January, February, March and December, with each month seeing an average of 371 mm of rainfall.