Brazil's massive size means highly variable weather. Rio de Janeiro has a tropical climate: hot and humid year-round (25–32°C), with a rainy season November–March and Carnival taking place in February/early March. June–September is the driest, most comfortable period. The Amazon is hot and wet year-round, with the driest months June–November preferred for visits.
The Northeast (Salvador, Fortaleza) is sunny and hot year-round with very little rain — ideal beach season is July–January. The South (Curitiba, Florianópolis) has more distinct seasons: cold winters (June–August can reach near 0°C) and warm summers. The Pantanal's dry season (May–September) is the best time for wildlife viewing as animals concentrate around water sources.