Well, Brazil is very wide so it's hard to say how the weather is , but overall it's wet and hot during summer, from December to March more or less, especially in February (I know because it always rains in my first day at class, after vacation ), then it's warm and dry during winter, in July especially. Fall/Spring are a bit unstable, it usually rains during fall, at least where I live. In the south, for example, it's usually colder than the rest of the country though. But with all the global warming thing, the weather's been acting crazy lately