The seasons are reversed from the United States, so when you are freezing up here during our winter, it is their summer. In general Brazil is tropical but within that framework the weather changes from north to south and from coast to interior. Only the southern states experience any major seasonal changes and can experience cool weather.
Rio's summer season (December-March) is extremely humid and can have daily downpours which are welcomed as they cool things down, but the sun is never far away. Temperatures average in the 80's but the 90's are not unusual. In Rio's winter (June-August) temperatures are generally in the 70's and rain can be persistent.
The Amazon is hot and humid all year long so it boils down to "the rainiest months". The heaviest rains are December through March, causing the river to rise, the creeks and lakes to flood and the animals to seek dry land. In their "dry season" (June through August) it still rains but not as much or as heavy and the heat is less oppressive.
The Pantanal is best visited May through September because it is the dry season as well as a major nesting and migratory season - the wildlife is more likely to be clustered together around water or nesting areas, and thus easier to see. |